What Are Brass Machined Washers?
Brass machined washers are precision washers manufactured by CNC turning or automatic screw machine operations, rather than by stamping or pressing. CNC machining allows for much tighter dimensional tolerances, more complex profiles (shoulders, recesses, stepped bores, chamfers), and superior surface finishes compared to stamped washers. Jamnagar Brass Components specializes in precision-turned brass washers for hydraulic, pneumatic, instrumentation, and electronic assembly applications where stamped washers cannot meet the required specifications.
Types of Brass Machined Washers We Produce
Precision Flat Brass Machined Washers
CNC-turned flat washers with extremely tight face parallelism (≤0.01mm), controlled ID/OD tolerances (h6/H7), and burr-free edges. Used as precision spacers in hydraulic valve stacks, pneumatic cylinders, and instrument assemblies.
Stepped (Shouldered) Brass Washers
Turned washers with an integral shoulder that locates in a counterbore or bore, preventing lateral movement. Widely used in electronic assemblies, PCB standoffs, and precision mechanical assemblies in the US aerospace and defense sectors.
Brass Sealing Washers (Bonded & Plain)
Precision-machined brass washers used as hydraulic port seals and pipe joint seals. Available plain or with bonded elastomer sealing ring (nitrile, EPDM, neoprene). Machined to BS 4518 and ASME B16.48 face dimensions for US hydraulic fittings.
Thick Brass Spacer Washers
Heavy-section machined brass washers functioning as precision spacers in bearing housings, shaft assemblies, and gearbox applications. Available from 3mm to 50mm thickness, with OD up to 150mm.
Brass Fender (Extra Large OD) Washers – Machined
Machined large-OD brass fender washers with precise flatness and perpendicularity for load-distributing applications in structural assemblies, boat fittings, and architectural hardware.
Brass Reducing Washers
Machined washers with stepped ID for adapting a larger-bore fastener location to a smaller fastener — common in US electrical conduit knock-outs and panel board wiring.
Threaded Brass Washers (Weld Nuts)
CNC-turned brass washers with internal threaded bore — essentially a thin brass hex nut with a washer flange. Used in sheet metal assemblies where a captive nut with load-spreading washer face is required.
Material Grades and International Equivalents
| Alloy | India (IS) | USA (ASTM/UNS) | UK (BS) | Germany (DIN) | Best For |
|---|---|---|---|---|---|
| Free Cutting Brass | IS 319 Type I | UNS C36000 / ASTM B16 | BS 2874 CZ121 | DIN CuZn39Pb3 | General machined washers, high volume |
| Naval Brass | IS 291 Gr-1 | UNS C46400 / ASTM B21 | BS CZ112 | DIN CuZn38Sn1 | Marine, seawater-exposed assemblies |
| DZR Brass | IS 319 DZR | UNS C69300 | BS CW602N | DIN CuZn36Pb2As | Potable water, hot water systems |
| Aluminium Brass | IS 1545 Al | UNS C68700 / ASTM B111 | BS CZ110 | DIN CuZn20Al2 | Condenser, heat exchanger seals |
| Lead-Free Brass | IS LF | UNS C27450 / NSF-61 | BS EN 12165 | DIN CuZn36 | Drinking water contact, Prop 65 |
Manufacturing Capabilities
- Diameter Range: OD 3mm to 150mm; ID 1.5mm to 100mm
- Thickness Range: 0.5mm to 50mm
- Tolerances: ID/OD ±0.01mm; Thickness ±0.01mm; Flatness ≤0.01mm/100mm
- Machining Centers: CNC multi-spindle, Swiss-type, and conventional automatic lathes
- Inspection: CMM, optical comparator, surface roughness tester, hardness testing
- Annual Capacity: Over 10 million pieces per year
Applications of Brass Machined Washers
- Hydraulics & Pneumatics – Valve body seals, port plugs, actuator spacers
- Electronics & PCB Assembly – Standoffs, spacers, grounding washers
- Instrumentation – Pressure gauge connections, sensor mounting
- Plumbing & HVAC – Union washers, compression ring supports, valve packing
- Automotive – Transmission shims, EGR valve spacers, fuel rail washers
- Electrical – Reducing washers for conduit knock-outs, grounding lug washers
Why Choose Jamnagar Brass Components for Machined Brass Washers?
- Tight Tolerance Capability – ±0.01mm dimensional control on ID, OD, and thickness for critical assemblies.
- Complex Profile Machining – Shoulders, chamfers, grooves, and counterbores machined in a single setup.
- Traceability – Full material and production batch traceability with heat number certs and CMM reports.
- Flexible MOQ – Prototypes from 50 pieces; production runs from 500 pieces.
- Export Packaging – Rust-inhibitor paper, VCI poly bags, and moisture-barrier packaging for sea freight.
- Direct Manufacturer – No trading company markup; factory-direct pricing with engineering support.
Frequently Asked Questions (FAQ)
Q: What is the tightest tolerance you can hold on a brass machined washer?
A: Using our CNC turning centers with in-process gauging, we routinely hold ±0.005mm (±0.0002″) on bore diameters and ±0.01mm on OD and thickness for small-diameter washers (under 25mm).
Q: Can you supply brass machined washers with O-ring grooves?
A: Yes. We machine face or bore O-ring grooves to AS568 (US standard) or BS 4518 dimensions. Brass sealing washers with bonded O-rings are also available.
Q: How do machined washers compare to stamped washers in performance?
A: Machined washers offer significantly better flatness, squareness, and dimensional consistency than stamped washers. They also allow complex cross-sections impossible to achieve by stamping. The trade-off is higher per-unit cost, making them most suitable for precision or engineering-critical applications.
Q: Do you provide surface roughness specifications on machined washers?
A: Yes. We machine to specified Ra values (typically Ra 0.8–3.2 µm) and verify with a profilometer. For sealing face washers, Ra 0.8 µm or better is standard.
Request a Quote for Brass Machined Washers
Submit your drawings or specifications to Jamnagar Brass Components for a fast turnaround quotation on precision brass machined washers.
📧 Email: sales@jambrass.com
🌐 Website: www.jambrass.com