Comprehensive Overview of CNC Brass Screw Machine Parts and Precision Turned Components
We are one of the leading manufacturers and exporters of CNC Brass Screw Machine Parts, Precision Brass Turned Components, and Automatic Screw Machine Products from India. We have been supplying high-quality brass screw machined parts, precision brass turned components, multi-spindle screw machine parts, CNC automatic lathe components, and custom brass machined products to the world market for many decades. Our state-of-the-art manufacturing facility specializes in producing precision brass screw machine parts using advanced CNC multi-spindle automatic screw machines, CNC single-spindle automatic lathes, Swiss-type CNC turning centers, conventional screw machines, and comprehensive quality control systems. With over three decades of global experience in precision brass screw machining, we serve diverse industries including brass screw machine parts for plumbing and pipe fittings, precision brass turned components for electrical connectors and terminals, brass automatic lathe parts for automotive fuel and brake systems, CNC brass machined components for HVAC and refrigeration, brass screw machine products for industrial valves and actuators, precision turned brass fittings for hydraulic and pneumatic systems, brass automatic parts for hardware and furniture, CNC brass components for instrumentation and controls, brass screw machined fasteners and threaded parts, and precision brass turned products for consumer goods and appliances. Our expertise encompasses working with various brass alloys including Brass CDA 360 (C36000) free-cutting brass offering 100% machinability baseline for optimal production efficiency, Brass CDA 377 (C37700) forging brass for hot-forged components, Brass CDA 353 (C35300) high-leaded brass for ultra-high-speed machining, lead-free brass alloys including C27400, C26000 for RoHS compliance, DZR brass (CW602N) for water contact applications, and specialty brass alloys for unique requirements. We manufacture CNC brass screw machine parts ranging from miniature precision components 2mm diameter for electronics and instrumentation to large industrial parts 100mm diameter with lengths from 3mm to 300mm, all maintaining tight tolerances ±0.02mm to ±0.05mm standard (tighter ±0.01mm achievable), excellent surface finish Ra 0.8-1.6 micrometers as-machined, precise thread specifications per ISO, DIN, ASME standards, superior concentricity and perpendicularity, high production rates 100-1000 pieces per hour, and reliable performance in demanding industrial, plumbing, automotive, electrical, and mechanical applications.
CNC Brass Screw Machine Parts – High-Volume Precision Brass Turned Components
CNC Brass Screw Machine Parts represent precision-manufactured brass components produced using CNC automatic screw machines (also known as automatic lathes, turret lathes, or chucking machines), providing exceptional capabilities for high-volume production (100-1000 pieces per hour), complex multi-diameter turned geometries, consistent part-to-part quality, cost-effective manufacturing, and lights-out automated operation. Screw machine technology excels at producing brass parts requiring multiple turned diameters, external/internal threads, grooves, knurls, cross-holes, and complex profiles in continuous high-volume production runs.
CNC brass screw machine parts find extensive applications in:
Plumbing and Pipe Fitting Components
Compression Fittings: Compression nuts, ferrules, body components, union nuts with hexagonal flats and precision threads. Threaded Pipe Fittings: Brass nipples, couplings, bushings, plugs, caps, reducers, adapters with BSP, NPT, or metric threads. Flare Fittings: Flare nuts, union bodies, male/female adapters with 45° or 37° flare seats. Barb Fittings: Hose barb connectors, reducing barbs, multi-barb adapters with serrated surfaces. Specialty Fittings: Quick-connect bodies, push-to-connect components, check valve bodies, manifold connectors.
Electrical Components and Terminals
Terminal Blocks: Threaded brass terminals, binding posts, bus bar connections, grounding terminals, electrical studs. Connectors and Contacts: Electrical connector bodies, pin terminals, socket contacts, blade terminals, spade connectors. Switch Components: Switch housing parts, contact carriers, terminal screws, mounting hardware, actuator components. Power Distribution: Bus bar supports, circuit breaker parts, fuse holders, panel hardware, grounding bars.
Automotive and Transportation Parts
Fuel System Components: Fuel line connectors, carburetor jets and needles, fuel pump fittings, injector components, fuel filter housings. Brake System Parts: Brake line unions, bleeder screws, master cylinder fittings, proportioning valve components, ABS system parts. Cooling System: Radiator drain plugs, coolant connectors, thermostat housings, heater hose adapters, overflow fittings. Transmission and Hydraulic: Transmission cooler fittings, hydraulic adapters, pressure test ports, dipstick tubes, fluid connectors.
HVAC and Refrigeration Components
Refrigerant Fittings: Service valve bodies, charging port adapters, manifold gauge components, flare fittings for R-410A, R-134a. Condensate Drains: Drain valve bodies, trap fittings, condensate pump connections, overflow safety switches. Control Components: Pressure switch housings, temperature control parts, actuator components, thermostat fittings. System Connections: Line set connections, compressor fittings, evaporator coil adapters, condenser connections.
Valve Components and Actuators
Valve Stems and Bonnets: Precision valve stems with multiple diameters, bonnet nuts, packing glands, stem guides. Valve Seats and Discs: Cone seats, ball seats, disc retainers, seat rings, check valve components. Control Valves: Actuator housing parts, linkage components, position indicators, adjustment mechanisms, locking nuts. Handle and Knob Components: Valve handle inserts, control knobs, hand wheel hubs, lever components.
Hydraulic and Pneumatic Fittings
Hydraulic Adapters: Straight adapters, elbow adapters, tee adapters, cross fittings, reducing adapters with SAE, JIC, ORFS threads. Pneumatic Fittings: Quick-disconnect bodies, push-to-connect components, compression fittings, pipe-to-hose adapters. Manifold Components: Port plugs, test port fittings, gauge adapters, bleed screws, pressure relief valve bodies. System Hardware: Tube nuts, ferrules, sleeves, caps, blanking plugs, flow restrictors.
Hardware and Furniture Components
Furniture Hardware: Adjustable legs, leveling feet, mounting brackets, hinge pins, drawer slide components, handle inserts. Cabinet Hardware: Shelf support pins, cam locks, connecting bolts, eccentric fittings, knockdown hardware. Door and Window: Strike plates, latch components, window hardware, sliding door parts, lock housings. Decorative Hardware: Knobs, pulls, finials, curtain rod components, decorative caps, ornamental parts.
Fasteners and Threaded Components
Machine Screws and Studs: Precision machine screws, threaded studs, set screws, shoulder screws, binding head screws. Nuts and Inserts: Hex nuts, coupling nuts, cap nuts, threaded inserts, lock nuts, adjustment nuts. Pins and Spacers: Dowel pins, clevis pins, taper pins, spacer bushings, standoffs, threaded spacers. Custom Fasteners: Special head screws, proprietary thread forms, multi-diameter fasteners, combined features.
Instrumentation and Control Components
Gauge Fittings: Pressure gauge adapters, gauge cocks, siphons, snubbers, isolation valves, dampeners. Sensor Housings: Temperature sensor bodies, pressure transducer housings, flow sensor components, level switch parts. Sample Ports: Sample valve bodies, quick-connect sampling points, drain and vent fittings, test connections. Process Connections: Thermowell adapters, chemical injection fittings, analyzer connections, calibration ports.
Industrial Machinery Parts
Bearing Components: Sleeve bearings, flanged bushings, thrust washers, pivot bushings, wear plates. Shaft Components: Precision shafts with multiple diameters, gear blanks, pulley hubs, coupling components. Mounting Hardware: Threaded inserts, anchor bolts, adjustment screws, positioning pins, alignment components. Machine Elements: Worm gears, pinion shafts, cam followers, roller pins, guide bushings.
Our CNC Brass Screw Machining Services and Capabilities
Advanced Screw Machine Equipment Fleet
Multi-Spindle CNC Automatic Screw Machines: 4-spindle, 6-spindle, 8-spindle configurations processing bar stock 6-65mm diameter, simultaneous operations on all spindles, production rates 200-1000 pieces per hour for simple to moderate complexity, ideal for high-volume orders 50,000-5,000,000+ pieces annually. Single-Spindle CNC Automatic Lathes: CNC chucker machines handling bar stock 10-100mm diameter, 2-axis to 4-axis with live tooling, sub-spindle for complete parts in one cycle, production rates 50-300 pieces per hour, suitable for medium to complex parts. Swiss-Type CNC Turning Centers: Sliding headstock lathes for small precision parts 2-32mm diameter, 5-axis to 9-axis simultaneous machining, tight tolerances ±0.01mm, lengths up to 300mm, production rates 50-500 pieces per hour. Conventional Screw Machines: Brown & Sharpe, Davenport, New Britain machines for proven traditional production, cam-operated tooling for consistent quality, economical for extremely high volumes.
Precision Screw Machining Operations
Turning Operations: Multiple OD diameters (step turning, taper turning, radius turning, form turning), multiple ID operations (drilling, boring, reaming, counterboring), facing operations (face cuts, chamfers, center drills), grooving (external grooves, internal grooves, face grooving, form grooving), threading (external threads, internal tapped holes, single-start, multi-start, fine pitch, coarse pitch), knurling (diamond knurl, straight knurl, custom patterns), parting and cutoff operations. Secondary Operations: Cross-drilling perpendicular holes, milling flats and slots, broaching keyways and splines, grinding for tight tolerances, thread rolling for high-strength threads, deburring and finishing, assembly operations where required.
Brass Alloy Materials for Screw Machining
Brass CDA 360 (C36000): Free-cutting brass with 3% lead, 100% machinability baseline, tensile strength 380-470 MPa, excellent for complex screw machining, superior chip breaking, economical for high-volume production, surface finish Ra 0.8-1.6 μm as-machined. Brass CDA 353 (C35300): High-leaded brass with 3.5% lead, maximum machinability for ultra-high-speed cutting, tensile strength 360-440 MPa, best for simple high-volume parts requiring fastest cycle times. Brass CDA 377 (C37700): Forging brass 60% Cu, 38% Zn, 2% Pb, 80% machinability, higher strength applications, good hot workability for forged blanks. Lead-Free Brass: C27400 (63% Cu, 37% Zn), C26000 cartridge brass (70% Cu, 30% Zn), C69300 silicon brass, RoHS and medical device compliant, 60-70% machinability requiring longer cycle times. DZR Brass CW602N: Dezincification resistant brass, 58% Cu, 39% Zn with As/Sn, superior corrosion resistance for water contact, 65% machinability. Specialty Alloys: Naval brass C46400, aluminum brass C68700, admiralty brass C44300, custom alloys per specifications.
Tolerance Capabilities and Quality Standards
Dimensional Tolerances: Standard screw machining ±0.05mm general features, precision ±0.02mm tight features, high-precision ±0.01mm with secondary grinding, length tolerances ±0.1mm to ±0.2mm depending on overall length. Geometric Tolerances: Concentricity 0.02-0.05mm TIR between diameters (tighter with Swiss-type machines), perpendicularity 0.02-0.05mm per feature, parallelism 0.05mm per 100mm length, cylindricity and roundness 0.02-0.05mm. Thread Tolerances: 6H/6g tolerance class standard for metric threads, 2B/2A standard for unified threads, tighter 4H/4g to 5H/5g available for precision applications, thread depth and pitch diameter per ISO 965, ASME B1.1, DIN 13 standards. Surface Finish: As-machined turning Ra 0.8-1.6 μm typical for free-cutting brass, Ra 1.6-3.2 μm for drilling and boring operations, Ra 0.4-0.8 μm achievable with fine finishing cuts, Ra 0.2-0.4 μm with grinding operations.
Thread Specifications for Screw Machine Parts
Metric Threads: M2, M2.5, M3, M3.5, M4, M5, M6, M8, M10, M12, M14, M16, M20, M24, M27, M30, M36, M42, M48 with standard and fine pitches per ISO 68-1. Unified Threads (UNC/UNF): #2-56, #4-40, #6-32, #8-32, #10-24, #10-32, 1/4″-20, 1/4″-28, 5/16″-18, 5/16″-24, 3/8″-16, 3/8″-24, 7/16″-14, 1/2″-13, 1/2″-20, 5/8″-11, 3/4″-10, 1″-8 per ASME B1.1. BSP Threads: G1/8″, G1/4″, G3/8″, G1/2″, G3/4″, G1″, G1-1/4″, G1-1/2″, G2″ parallel threads per ISO 228, R1/8″ to R2″ tapered threads per ISO 7. NPT Threads: 1/8″ NPT, 1/4″ NPT, 3/8″ NPT, 1/2″ NPT, 3/4″ NPT, 1″ NPT, 1-1/4″ NPT, 1-1/2″ NPT, 2″ NPT per ASME B1.20.1. Special Threads: ACME, trapezoidal, buttress, square threads, multi-start threads, left-hand threads, custom proprietary forms.
Surface Treatments and Finishing Services
Electroplating: Nickel plating (bright, semi-bright, black nickel) 5-25 microns for corrosion protection and wear resistance, tin plating (bright, matte) 5-15 microns for solderability and food contact, zinc plating (clear, yellow, black) 5-15 microns for general corrosion protection, chrome plating (decorative, hard chrome) for appearance and extreme wear, gold plating (0.5-5 microns) over nickel for electrical contacts, silver plating for high electrical conductivity and low contact resistance. Chemical Treatments: Passivation preventing tarnish and surface oxidation, chromate conversion coating (clear, yellow, olive drab) per MIL-DTL-5541, phosphate coating for enhanced paint adhesion, blackening/black oxide for matte black appearance. Mechanical Finishing: Barrel tumbling (vibratory or rotary) for deburring and uniform surface finish, bead blasting for matte appearance and surface preparation, polishing (manual or automated) for mirror finish and decorative appearance, brushing for directional satin finish. Protective Coatings: Clear lacquer coating maintaining brass appearance while preventing tarnish, powder coating for decorative colors and enhanced corrosion protection, PTFE/Teflon coating for low friction and chemical resistance, specialty coatings per application requirements.
Screw Machine Technology Advantages for Brass Parts
High-Volume Production Efficiency
Fast Cycle Times: Multi-spindle machines completing parts in 10-60 seconds per cycle with 4-8 parts per cycle, single-spindle automatics 20-120 seconds per part depending on complexity, continuous production with automatic bar feeding, minimal setup time between production runs for repeat orders. Lights-Out Operation: CNC automation enabling unmanned production during nights and weekends, bar feeders holding 10-15 feet of bar stock for continuous operation, automatic part ejection and collection systems, built-in part inspection and sorting, production runs exceeding 50,000 parts unattended.
Cost-Effective Manufacturing
Material Efficiency: Bar stock feeding directly into machine minimizing handling, standard bar diameters 6-100mm readily available at competitive pricing, minimal scrap with efficient nesting and parting, brass chips recyclable with high scrap value recovering 70-80% material cost. Lower Labor Costs: High production rates reducing per-piece labor cost dramatically, one operator monitoring multiple machines (4-8 machines typical), reduced inspection time with consistent automated quality, lower training requirements compared to manual operations.
Consistent Quality and Repeatability
Automated Process Control: CNC programming ensuring identical operations on every part, consistent tool positioning and feeds/speeds, automatic tool wear compensation maintaining dimensional accuracy, in-process monitoring detecting out-of-tolerance conditions. Statistical Process Control: Real-time dimensional monitoring of critical features, control charts tracking process capability (Cpk), automated data collection from machine controllers, predictive maintenance preventing quality issues.
Complex Geometries in Single Setup
Multiple Operations: Turning, drilling, boring, threading, grooving, knurling, parting in one continuous cycle, no part repositioning eliminating setup errors and improving concentricity, front-end and back-end operations with sub-spindle (where equipped), reduced handling lowering risk of damage or contamination.
Excellent Surface Finish on Free-Cutting Brass
Optimal Cutting Conditions: Free-cutting brass CDA 360 producing excellent surface finish with standard tooling, lead particles acting as chip breakers creating short discontinuous chips preventing built-up edge, high cutting speeds (200-500 surface feet per minute) achieving fine finishes, minimal burrs requiring less secondary deburring, achieving Ra 0.8-1.6 μm as-machined consistently.
Standard CNC Brass Screw Machine Part Dimensions
Dimensional Capabilities by Machine Type
| Machine Type | Bar Capacity | Length Range | Typical Complexity | Production Rate | Ideal Volume |
|---|---|---|---|---|---|
| Multi-Spindle 4-8 Spindle | 6-65mm dia | 10-150mm | Simple to moderate | 200-1000 pcs/hr | 50,000-5,000,000/yr |
| Single-Spindle CNC Auto | 10-100mm dia | 15-250mm | Moderate to complex | 50-300 pcs/hr | 10,000-500,000/yr |
| Swiss-Type CNC | 2-32mm dia | 5-300mm | Complex precision | 50-500 pcs/hr | 5,000-500,000/yr |
| CNC Chuckers | 20-200mm dia | 10-500mm | Very complex | 20-150 pcs/hr | 1,000-100,000/yr |
Tolerance Summary by Feature Type
| Feature Type | Standard Tolerance | Precision Tolerance | Notes |
|---|---|---|---|
| Turned OD | ±0.05mm | ±0.02mm | Tighter with grinding ±0.01mm |
| Turned ID (Drilled) | ±0.05mm | ±0.03mm | Reamed holes ±0.02mm |
| Turned ID (Bored) | ±0.03mm | ±0.02mm | Multiple passes improve accuracy |
| Length | ±0.1-0.2mm | ±0.05mm | Depends on overall length |
| Thread Pitch Diameter | 6H/6g, 2B/2A | 4H/4g, 3B/3A | Per ISO 965, ASME B1.1 |
| Concentricity (TIR) | 0.05mm | 0.02mm | Swiss-type 0.01mm achievable |
| Perpendicularity | 0.05mm | 0.02mm | Face to axis or feature to feature |
| Surface Finish (Ra) | 0.8-1.6 μm | 0.4-0.8 μm | Ground 0.2-0.4 μm |
Quality Control and Inspection for Screw Machine Parts
Advanced Inspection Equipment
Coordinate Measuring Machines (CMM): Zeiss, Mitutoyo, or Hexagon CMM with ±0.003-0.005mm accuracy for 3D measurement, automated inspection programs for production parts, dimensional reports with statistical analysis Cp/Cpk, temperature-controlled environment 20°C ±1°C for precision measurement. Optical Inspection: Optical comparators 10× to 50× magnification for profile measurement and comparison to master, vision measuring systems with edge detection software, automated optical inspection (AOI) for 100% inspection in production, surface defect detection and classification. Gauging Systems: Thread plug and ring gauges Go/No-Go per ISO, ASME, DIN standards for production verification, pin gauges for hole diameter verification, snap gauges for quick OD checking, height gauges and depth micrometers for length verification, air gauges for high-precision bore measurement.
In-Process Quality Control
First Article Inspection (FAI): Complete dimensional verification per AS9102 or customer requirements before production release, material certification and traceability verification, mechanical property testing where specified, thread functional testing with mating components, photographic documentation of key features, customer approval signature required before full production. Statistical Process Control (SPC): Real-time monitoring of critical dimensions during production runs, control charts (X-bar and R charts) tracking process stability, Cpk analysis target ≥1.33 for critical features, ≥1.67 for key characteristics, automated data collection from digital micrometers and gauges, trending analysis identifying tool wear patterns, corrective action procedures for out-of-control conditions.
Material Verification and Traceability
Chemical Composition Analysis: Optical emission spectrometry (OES) verifying brass alloy composition within ±0.5% of ASTM B16 specification (Cu, Zn, Pb, Fe content), X-ray fluorescence (XRF) for rapid alloy verification and screening, complete material certificates from mill with heat number traceability. Mechanical Property Testing: Tensile testing per ASTM E8 determining tensile strength, yield strength, elongation percentage, hardness testing Brinell (HB), Rockwell B (HRB), or Vickers (HV) verifying material temper, shear strength testing where required for specific applications. Lot Traceability: Bar stock lot number tracking from receipt through production, production date, machine number, operator identification recorded, inspection records and test results linked to lot numbers, serialization available for critical applications requiring individual part traceability.
Thread Inspection and Verification
Go/No-Go Thread Gauges: Thread plug gauges (Go and No-Go) for internal threads verification per ISO 1502, ASME B1.2, thread ring gauges (Go and No-Go) for external threads verification, 6H/6g tolerance class standard, tighter 4H/4g to 5H/5g for precision, regular gauge calibration and certification per ISO 17025. Thread Micrometers: Pitch diameter measurement using thread micrometers or three-wire method, thread depth verification, functional fit testing threading into mating components, thread form inspection using optical comparators. Thread Quality: Visual inspection for torn threads, incomplete threads, burrs, dimensional verification of major, minor, pitch diameters, thread angle and pitch verification, thread surface finish evaluation.
Applications and Industry Examples
Plumbing and Pipe Fitting Industry
Compression Fittings: Brass compression nuts 1/4″ to 2″ with hexagonal flats 12-50mm A/F, internal threads M8-M30 or 5/16″-24 to 1-1/2″-12, compression ferrules and sleeves with precision ID/OD diameters ±0.02mm, union bodies with dual threads and O-ring grooves. Threaded Pipe Fittings: Brass nipples 1/8″ to 2″ NPT or BSP threads with hex center sections, couplings with internal threads both ends, reducing couplings combining different thread sizes, bushings with external and internal threads for size reduction, plugs and caps for sealing pipe ends. Production Volumes: High-volume standard fittings 100,000-5,000,000 pieces annually, medium-volume specialty fittings 10,000-100,000 pieces, custom fittings for OEM applications 5,000-50,000 pieces.
Electrical Terminal and Connector Components
Binding Posts and Terminals: Brass binding posts M4-M10 threads with knurled or hexagonal bodies for panel mounting, threaded terminals for bus bars and power distribution with multiple thread diameters, grounding terminals with serrated contact surfaces, battery terminals with internal threads and conical seats. Connector Bodies: Electrical connector housings machined from brass bar stock with precision internal features, terminal block components with multiple threaded holes, switch housing parts with mounting threads and internal cavities, relay base components with precise pin locations. Production Requirements: Tight tolerances ±0.02mm for proper mating, surface finish Ra 1.6 μm for electrical contact, nickel or tin plating 5-15 microns for corrosion protection and conductivity.
Automotive Fuel and Brake System Parts
Fuel System Components: Fuel line connectors M10×1.0, M12×1.5, M14×1.5 threads for high-pressure diesel systems (up to 2000 bar), carburetor jets with precision orifices 0.5-2.0mm diameter ±0.02mm tolerance, fuel pump fittings with flare seats and O-ring grooves, fuel filter housing adapters with multiple thread sizes. Brake System Parts: Brake line unions and adapters M10×1.0, 3/16″ flare, 1/4″ flare fittings, brake bleeder screws M7×1.0, M8×1.25, M10×1.0 with hex heads and cone seats, master cylinder fittings, proportioning valve components, ABS hydraulic unit connectors. Quality Requirements: 100% pressure testing to 1.5× working pressure, salt spray testing 96+ hours for corrosion resistance, dimensional inspection with Cpk ≥1.67, lot traceability per automotive PPAP requirements.
HVAC and Refrigeration Fittings
Refrigerant Service Valves: Brass service valve bodies for R-410A, R-134a, R-22 refrigerants with SAE flare connections 1/4″, 3/8″, 1/2″, 5/8″, charging port adapters with Schrader valve cores, manifold gauge set components with multiple ports and threads, quick-connect fittings for service equipment. System Connections: Flare nuts for copper tubing connections in air conditioning systems, compression fittings for condensate drain lines, brazed joint adapters for refrigerant lines, expansion valve components with precision orifices controlling refrigerant flow. Temperature Range: Components rated for -40°C to +120°C continuous service, pressure ratings 350-650 PSI for low-pressure refrigerants, leak-free performance critical for environmental compliance.
Valve Component Manufacturing
Valve Stems: Precision valve stems with multiple diameters M8-M20 threads, hex sections 13-32mm A/F for wrench engagement, O-ring grooves with precision dimensions for sealing, lengths 30-200mm with straightness 0.1mm per 100mm, brass CDA 360 or lead-free C27400 for potable water applications. Bonnet Components: Bonnet nuts with internal threads and hexagonal OD, packing glands with precision bores and threads, stem guides (bushings) with tight bore tolerance H7 or H8, valve seat rings with cone or ball seat geometry machined to Ra 0.8 μm. Production Efficiency: Multi-spindle screw machines producing valve stems 300-800 pieces per hour, single-spindle automatics for complex bonnet nuts 100-250 pieces per hour, batch sizes 10,000-500,000 pieces per production run.
Hydraulic and Pneumatic Fitting Production
Hydraulic Adapters: SAE straight thread O-ring boss (ORB) fittings 7/16″-20, 9/16″-18, 3/4″-16, 1-1/16″-12, JIC 37° flare fittings 7/16″-20 to 1-5/16″-12, ORFS O-ring face seal fittings, metric hydraulic threads M10×1.0 to M42×2.0, adapters combining different thread types and sizes. Pneumatic Fittings: Pipe threads 1/8″ to 1″ NPT or BSPT for pneumatic systems, quick-disconnect coupling bodies with precision internal diameters, push-to-connect fitting bodies with collet retention features, compression fittings for plastic and nylon tubing 4-16mm OD. Pressure Ratings: Hydraulic fittings rated 3000-5000 PSI working pressure, pneumatic fittings rated 150-250 PSI, burst pressure minimum 4× working pressure, zero-leak performance with proper assembly.
Hardware and Furniture Component Manufacturing
Adjustable Furniture Legs: Threaded brass legs M8×1.25, M10×1.5 threads × 50-200mm length with hex sections or decorative knurling, leveling feet with swivel bases and rubber pads, height adjustment range 20-50mm typical, nickel or chrome plating for decorative appearance. Cabinet Hardware: Brass cam lock studs M6×13-25mm length for RTA (ready-to-assemble) furniture, connecting bolts M6×40-80mm for panel joining, eccentric fittings for adjustable connections, threaded inserts for wood M4-M8 with coarse external threads. Production Volumes: Standard hardware components 50,000-1,000,000+ pieces annually enabling competitive pricing, custom decorative hardware 5,000-50,000 pieces for furniture OEMs, plating and finishing critical for appearance quality.
Fastener and Threaded Component Production
Machine Screws: Brass machine screws M2-M10 or #2-56 to 1/4″-20 with pan head, flat head, round head, hex head, lengths 3-50mm, slot, Phillips, hex socket drives, standard or custom head styles. Threaded Studs: Double-end studs with threads on both ends, lengths 10-100mm, continuous threaded rods, shoulder screws combining unthreaded shoulder with threaded section. Nuts and Spacers: Hex nuts M2-M20 with standard or fine pitch threads, coupling nuts for threaded rod connections, cap nuts for decorative covering, threaded spacers and standoffs for electronic enclosures. Custom Fasteners: Special head configurations for proprietary assemblies, security screws with unique drives, captive screws with retaining features, combined screw and washer assemblies.
Performance Specifications and Material Properties
Brass CDA 360 (C36000) Properties
| Property | Value | Measurement Standard |
|---|---|---|
| Copper (Cu) Content | 60.0-63.0% | ASTM B16 |
| Zinc (Zn) Content | 35.0-37.0% | ASTM B16 |
| Lead (Pb) Content | 2.5-3.7% | ASTM B16 |
| Tensile Strength | 380-470 MPa | ASTM E8 |
| Yield Strength | 180-410 MPa | ASTM E8 |
| Elongation | 18-40% | ASTM E8 |
| Hardness | 85-110 HB, 70-85 HRB | ASTM E10, E18 |
| Machinability Rating | 100% (baseline) | Industry standard |
| Density | 8.50 g/cm³ | Calculated |
| Thermal Conductivity | 115 W/m·K | At 20°C |
| Electrical Conductivity | 26-28% IACS | ASTM B193 |
| Melting Point | 885-900°C | – |
| Coefficient Thermal Expansion | 20.5 × 10⁻⁶/°C | Linear, 20-300°C |
| Operating Temperature | -40°C to +200°C | Continuous service |
Brass Alloy Comparison for Screw Machining
| Alloy | Machinability | Tensile Strength | Lead Content | Best Applications | Cost Factor |
|---|---|---|---|---|---|
| C36000 (CDA 360) | 100% | 380-470 MPa | 3.0% | General purpose, highest volume | Standard |
| C35300 (CDA 353) | 110% | 360-440 MPa | 3.5% | Ultra-high-speed, extreme volumes | Standard |
| C37700 (CDA 377) | 80% | 380-450 MPa | 2.0% | Higher strength, forged components | +5-10% |
| C27400 (Lead-Free) | 60% | 340-470 MPa | <0.05% | Medical, RoHS, potable water | +15-25% |
| C69300 (Silicon Brass) | 70% | 450-550 MPa | <0.25% | NSF/ANSI 61, drinking water | +20-35% |
| CW602N (DZR) | 65% | 400-500 MPa | <0.1% | Water contact, corrosion-resistant | +25-40% |
Design for Screw Machining (DFSM) Guidelines
Cost Optimization Recommendations
Simplify Geometry: Minimize number of diameter changes reducing tool changes and cycle time, avoid deep internal pockets requiring special tooling, use standard thread forms and sizes eliminating custom tools, consolidate features accessible with standard tool set. Material Selection: CDA 360 free-cutting brass offers lowest machining cost due to 100% machinability and excellent chip breaking, lead-free alternatives require 15-40% longer cycle times increasing per-piece cost, consider plating versus solid lead-free material if surface-only compliance needed.
Production Volume Considerations
High-Volume Design (>50,000 pieces): Optimize for multi-spindle screw machine production maximizing automation, accept standard tolerances ±0.05mm where functionally adequate, use bar stock diameters minimizing material waste, design for minimum cycle time even if requiring investment in dedicated tooling. Medium-Volume Design (5,000-50,000): Balance between complexity and production efficiency, single-spindle CNC automatics offering flexibility, tighter tolerances ±0.02mm achievable economically, secondary operations (drilling, milling) feasible without excessive cost. Low-Volume Design (<5,000 pieces): Maximize design flexibility and feature complexity, Swiss-type machines or CNC chuckers suitable, custom tooling investment carefully evaluated, consider design changes reducing machining complexity even if more parts required.
Tolerance and Quality Specifications
Specify Realistic Tolerances: Standard screw machining tolerances ±0.05mm adequate for most assembly requirements, specify tight tolerances ±0.02mm only on critical mating features, ultra-tight ±0.01mm requires secondary grinding adding 25-50% to part cost, avoid over-specification increasing inspection time and rejection risk. Thread Specifications: Standard 6H/6g or 2B/2A tolerance class suitable for 95% of applications, tighter 4H/4g or 3B/3A only for precision assemblies requiring multiple assembly/disassembly cycles, allow adequate thread relief (1-2 pitch lengths) and chamfer (1-2 threads) for tool exit. Surface Finish: Standard as-machined finish Ra 1.6 μm adequate for functional surfaces, specify Ra 0.8 μm only for sealing surfaces or cosmetic requirements, ground finish Ra 0.4 μm or polished Ra 0.2 μm reserved for critical bearing or sealing surfaces.
Why Choose Our CNC Brass Screw Machining Services
Three Decades of Screw Machine Manufacturing Excellence
Established Since 1990: Over 30 years specializing in precision brass screw machining serving plumbing manufacturers, electrical component producers, automotive OEMs, HVAC companies, valve manufacturers, and industrial equipment suppliers across 60+ countries worldwide. Proven Track Record: Successfully produced and delivered 500+ million brass screw machined parts with 99.5% on-time delivery performance, <0.5% defect rates, and zero product recalls over past decade. Industry Certifications: ISO 9001:2015 certified quality management system, PPAP Level 3 approved for automotive suppliers, RoHS and REACH compliant materials and processes, conflict-free mineral sourcing, working towards ISO 14001 environmental management and IATF 16949 automotive quality.
Comprehensive Screw Machine Equipment Fleet
Multi-Spindle Automatic Screw Machines: 15+ machines including Davenport 6-spindle, New Britain 6-spindle and 8-spindle, Wickman 6-spindle, Euroturn 6-spindle for ultra-high-volume production 200-1000 pieces/hour, bar capacity 6-65mm diameter. Single-Spindle CNC Automatic Lathes: 20+ machines including Index MS32C, MS40C, Tsugami B038, Miyano BNE-51, Mori Seiki NL-2500 with bar capacity 10-100mm, 2-axis to 4-axis with live tooling, sub-spindle capability. Swiss-Type CNC Turning Centers: 25+ Swiss machines Citizen Cincom, Tsugami SS-series, Star Micronics SR-series, Tornos Deco for precision small parts 2-32mm diameter, 5-9 axis simultaneous machining. CNC Chuckers and Turning Centers: Okuma LB series, Doosan Puma, Haas ST series for larger parts 50-200mm diameter and complex geometries.
High-Volume Production Capacity and Flexibility
Annual Production Capacity: Combined capacity exceeding 100 million brass screw machined parts annually across all machine types, dedicated production cells for high-volume products maintaining consistent quality. Volume Flexibility: Prototypes (50-100 pieces) for design validation and testing within 3-5 days, small production (100-5,000) economical for specialty products, medium volumes (5,000-50,000) optimal balance of setup and run efficiency, high-volume (50,000-5,000,000+) achieving lowest per-piece cost through dedicated production. Inventory Management: Blanket purchase orders with scheduled releases, vendor-managed inventory (VMI) maintaining stock at customer facilities, kanban systems for just-in-time delivery, consignment inventory programs for qualified customers.
Precision Quality Control and Testing
Advanced Inspection Equipment: Zeiss Contura G2 RDS CMM (700×1000×600mm, ±0.003mm accuracy), Mitutoyo Crysta-Apex S CMM, Keyence IM-8000 Series image dimension measurement systems, Mahr MarSurf surface roughness testers, complete thread gauge sets for all standard threads ISO, ASME, DIN. In-Process Inspection: Real-time SPC monitoring with Cpk targets ≥1.33 for critical dimensions, automated gauging systems on high-volume lines, 100% visual inspection stations with reject bins, coordinate measuring probes on selected CNC machines for automated inspection. Testing Capabilities: Pressure testing equipment for hydraulic and pneumatic fittings to 10,000 PSI, salt spray chambers per ASTM B117 (96-1000 hours), plating thickness measurement with XRF, material verification with OES spectrometer, mechanical testing with universal testing machine.
Complete Surface Treatment and Finishing Services
In-House Electroplating: Barrel plating lines for small parts (nickel, tin, zinc) 5-25 micron thickness, rack plating for larger parts requiring individual contact, automated plating controls maintaining consistent thickness and adhesion, wastewater treatment system ensuring environmental compliance. Partner Network: Specialized plating partners for gold plating (0.5-5 microns over nickel undercoat), silver plating for electrical contacts, hard chrome plating for wear resistance, electroless nickel for uniform coating complex geometries. Finishing Services: Vibratory tumbling for deburring and surface improvement, centrifugal barrel finishing for high-energy deburring, bead blasting for matte finish, polishing (manual and automated) for cosmetic appearance, passivation and chromate treatments preventing tarnish.
Engineering Support and Value-Added Services
Design for Manufacturability (DFM): Free DFM analysis for new part designs identifying cost reduction opportunities, tolerance optimization recommendations balancing function and manufacturing cost, material selection guidance based on application requirements and volume. Prototyping and Sampling: Rapid prototype production 3-10 days for design validation, pre-production samples with complete dimensional reports for approval, PPAP documentation Level 1-5 per customer requirements for automotive. Custom Solutions: Reverse engineering from samples or competitor parts, value engineering improving designs while reducing costs, assembly services combining multiple components into sub-assemblies, packaging solutions custom packaging for retail or industrial distribution.
Competitive India Manufacturing Advantages
Cost Competitiveness: 40-55% cost savings versus North American manufacturers for equivalent quality and precision, 35-50% savings versus European sources, 20-35% savings versus Chinese sources while offering superior quality control and communication. Volume-Based Pricing: High-volume pricing (>50,000 pieces): 20-30% discount from prototype pricing, ultra-high-volume (>500,000): 35-45% discount, blanket order commitments: additional 5-10% discount for 12-month agreements. Transparent Costing: Detailed cost breakdowns showing material, machining, surface treatment, inspection, packaging, competitive pricing without hidden fees or surprise charges.
Global Export and Logistics Expertise
International Shipping: Established partnerships with DHL, FedEx, UPS for air freight express (3-7 days worldwide), Maersk, MSC, COSCO for sea freight LCL/FCL (4-6 weeks to major ports), freight forwarding agents managing customs clearance and documentation. Export Documentation: Complete export documentation package including commercial invoice, packing list, certificate of origin (for preferential tariffs), material certificates with composition analysis, dimensional inspection reports, test results, customs declarations HS code classification. Regional Experience: Extensive export experience to USA and Canada (40% of exports), European Union (30%), Middle East (15%), Asia-Pacific (10%), Latin America (5%), understanding import regulations and compliance requirements.
Fast Turnaround and Delivery Performance
Lead Times – Prototypes: Simple turned parts: 3-5 days, complex parts with secondary operations: 5-10 days, parts with plating/finishing: 7-14 days, expedited 2-3 day service available with premium. Lead Times – Production: Repeat orders from established programs: 1-2 weeks, new parts with tooling/programming: 2-4 weeks, high-volume orders with dedicated setup: 3-6 weeks including testing and documentation. On-Time Delivery: 99.5% on-time delivery performance tracked over past 5 years, proactive communication if any delays anticipated, expedited shipping options at our cost if we cause delays, performance metrics dashboard available to qualified customers.
Frequently Asked Questions
Q1: What production volumes are most economical for brass screw machining? Multi-spindle screw machines most economical for high volumes >50,000 pieces annually with simple to moderate complexity, setup costs amortized over large quantities achieving per-piece cost $0.05-$0.50 depending on size. Single-spindle CNC automatics optimal for 5,000-50,000 pieces with moderate to complex features, per-piece cost $0.20-$2.00. Swiss-type CNC suitable for 5,000-100,000 pieces requiring tight tolerances and small diameters, per-piece cost $0.15-$1.50. Prototypes and low volumes (<1,000 pieces): per-piece cost $1.00-$10.00+ depending on complexity due to setup time. Volume commitments through blanket orders significantly reduce per-piece cost.
Q2: What tolerances are standard for brass screw machining and what costs more? Standard tolerances: ±0.05mm turned diameters, ±0.1mm lengths, concentricity 0.05mm TIR, threads 6H/6g or 2B/2A, surface finish Ra 1.6 μm – included in base pricing. Precision tolerances: ±0.02mm diameters, ±0.05mm lengths, concentricity 0.02mm TIR, threads 4H/4g or 3B/3A, Ra 0.8 μm – adds 10-20% to part cost due to slower feeds, more precise tooling, increased inspection. Ultra-tight tolerances: ±0.01mm requiring grinding, concentricity 0.01mm TIR, Ra 0.4 μm – adds 25-50% cost for secondary grinding operations and 100% inspection.
Q3: Can you machine lead-free brass for RoHS compliance or potable water applications? Yes, we regularly machine lead-free brass alloys including C27400 (63% Cu, 37% Zn, <0.05% Pb) for general RoHS compliance, C26000 cartridge brass (70% Cu, 30% Zn) for medical devices, C69300 silicon brass (<0.25% Pb) for NSF/ANSI 61 potable water compliance. Lead-free brass has 60-70% machinability versus CDA 360 (100%), resulting in 15-40% longer cycle times and corresponding cost increase. For many applications, CDA 360 with nickel or tin plating provides surface compliance at lower total cost than solid lead-free material. We provide material certificates and RoHS declarations with shipments.
Q4: What surface treatments are available and what are lead time impacts? In-house plating (nickel, tin, zinc barrel plating): 5-10 day lead time for small to medium parts, thickness 5-25 microns, ASTM B117 salt spray testing 96-500+ hours. Rack plating and specialty coatings through partner facilities: 10-15 day lead time for gold, silver, hard chrome, electroless nickel. Mechanical finishing (tumbling, polishing, bead blast): 3-7 days. Chemical treatments (passivation, chromate): 5-7 days. For rush orders, plating can be expedited to 3-5 days with premium surcharge. Volume orders (>10,000 pieces) benefit from dedicated plating runs reducing per-piece cost 15-30%.
Q5: What documentation is provided with screw machined parts? Standard documentation package includes: Material Certificates from mill with heat number and chemical composition per ASTM B16 (Cu, Zn, Pb, Fe within ±0.5%), dimensional inspection reports from CMM or optical measuring systems with actual measurements versus specifications, thread gauge verification reports showing Go/No-Go results for all threaded features, Cpk analysis for critical dimensions showing process capability ≥1.33, plating certificates (if applicable) with thickness measurements and adhesion test results, certificate of conformance stating compliance to customer specifications, RoHS/REACH declarations for European Union shipments, PPAP documentation Level 1-5 per customer requirements for automotive applications.
Contact Us Today – Request Quote for Brass Screw Machine Parts
Ready to discuss your CNC brass screw machine part requirements for plumbing fittings, electrical components, automotive parts, valve components, hydraulic fittings, or industrial hardware?
Request a Quote: Send drawings (PDF, DWG, STEP, IGES formats), specifications including brass alloy, quantity, tolerances, surface finish to sales@jambrass.com for detailed quotation within 24 hours.
Engineering Support: Email technical drawings for free DFM review, tolerance analysis, cost optimization recommendations.
Call Us: +91-22-43449300 / +91-22-43449323 (Monday-Saturday, 9:00 AM – 6:00 PM IST)
Office Address: 1406, 14th Floor, Dalamal Tower, Nariman Point, Mumbai – 400021, Maharashtra, India
Factory Address: Plot 10B, GIDC Industrial Estate, Shanker Tekari, Udyognagar, Jamnagar, Gujarat, India – 361004
Contact Person: Mr. Mehul Vora
Email: sales@jambrass.com
