Comprehensive Technical Overview of Brass Square Nuts
We are one of the leading manufacturers and exporters of Brass Square Nuts, Square Machine Nuts, and Electrical Brass Fasteners from India. We have been supplying high-quality Brass Square Nuts, Heavy Square Nuts, Slotted Square Nuts, T-Slot Nuts, Electrical Brass Square Nuts, Custom Square Nuts, and Special Application Brass Square Nuts to the world market for many decades. Our state-of-the-art manufacturing facility specializes in producing premium Brass Square Nut Systems using advanced copper alloy formulation, precision hot forging, cold forming technology, CNC machining, heat treatment processes, surface finishing, automated assembly, quality testing, and comprehensive quality assurance systems. With over three decades of global experience in Brass Square Nut manufacturing, we serve diverse industries including electrical equipment manufacturing, furniture hardware, woodworking applications, marine hardware, industrial machinery, railway equipment, and general engineering applications. Our expertise encompasses working with various brass alloys including Free Cutting Brass (C36000), Architectural Brass (C38500), Naval Brass (C46400), Leaded Brass (C35300), and DZR Brass (CW602N). We manufacture Brass Square Nuts in sizes from M3 to M20, thread pitches including metric, UNC, UNF, and BSP, maintaining excellent corrosion resistance, good electrical conductivity, compliance with ISO 4036, DIN 557, ANSI B18.2.2, ASTM B16 standards, and reliable performance in various applications.
Types of Brass Square Nuts
Standard Brass Square Nuts
General Purpose Square Nuts with four equal sides and square profile, featuring precision-cut threads and sharp corners. Available in sizes from M3 to M12 with various thread pitches. These Universal Square Nuts provide reliable fastening for woodworking applications, furniture assembly, electrical enclosures, and general hardware applications where prevention of rotation is important.
Heavy Brass Square Nuts
Thick Pattern Square Nuts with increased thickness and larger bearing surface, featuring enhanced load distribution and higher torque capabilities. Sizes from M8 to M20 with robust construction. These High-Strength Square Nuts are essential for structural applications, heavy machinery, high-load assemblies, and load-bearing connections where maximum mechanical reliability is required.
Slotted Brass Square Nuts
Castle-Type Square Nuts with slots for cotter pin installation, featuring secure locking mechanism and safety retention. Available in sizes from M5 to M16 with precise slot machining. These Safety Lock Nuts are designed for critical assemblies, safety applications, moving parts, and applications requiring positive locking where vibration resistance is crucial.
T-Slot Brass Square Nuts
T-Track Compatible Nuts with specialized design for T-slots, featuring easy installation and adjustable positioning. These T-Slot Nuts provide versatile fastening for machine tables, workholding systems, jigs and fixtures, and modular assembly systems where adjustable positioning is required.
Brass Square Nuts with Set Screws
Locking Square Nuts with integrated set screw holes, featuring additional locking capability and secure positioning. These Double-Secured Nuts are crucial for precision equipment, adjustable mechanisms, alignment-critical applications, and situations requiring extra security.
Material Specifications & Properties
Brass Alloy Composition & Mechanical Properties
| Alloy Type | Composition | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) | Rockwell Hardness |
|---|---|---|---|---|---|
| Free Cutting Brass C36000 | 61.5% Cu, 35.5% Zn, 3% Pb | 340-420 | 170-200 | 25-35 | B78-B85 |
| Architectural Brass C38500 | 57-60% Cu, 35.5-40.5% Zn, 2.5-3.5% Pb | 380-450 | 160-190 | 30-40 | B70-B80 |
| Naval Brass C46400 | 60% Cu, 39.25% Zn, 0.75% Sn | 380-480 | 170-210 | 25-35 | B75-B85 |
| DZR Brass CW602N | 58-60% Cu, 36-38% Zn, 1.6-2.5% Pb | 400-500 | 180-220 | 20-30 | B80-B90 |
Performance Specifications & Standards
| Parameter | Standard Grade | Heavy Pattern Grade | Marine Grade | Test Standard |
|---|---|---|---|---|
| Proof Load | 200-500 MPa | 350-700 MPa | 300-600 MPa | ISO 898-2 |
| Torque Strength | 2-80 Nm | 10-150 Nm | 8-120 Nm | DIN 267 |
| Bearing Pressure | 80-300 N/mm² | 120-400 N/mm² | 100-350 N/mm² | ISO 898-2 |
| Corrosion Resistance | 500 hours | 750 hours | 1000+ hours | ASTM B117 |
Manufacturing Excellence
Advanced Manufacturing Process
Hot Forging Technology: Precision hot forging for superior grain structure and mechanical properties
Cold Forming Process: Multi-stage cold forming for dimensional accuracy and sharp corners
CNC Machining: Precision threading and slot machining operations
Heat Treatment: Stress relief annealing for optimal mechanical properties
Surface Treatment: Electroplating, polishing, and special coatings
Quality Testing: 100% dimensional, visual, and thread inspection
Quality Assurance Protocols
Raw Material Testing: Spectrochemical analysis for alloy composition verification
Dimensional Control: Optical comparator inspection with statistical process control
Mechanical Testing: Torque testing, tensile testing, and hardness testing
Thread Verification: Go/No-Go gauge testing for thread accuracy
Corner Quality: Visual inspection for sharp, well-defined corners
Performance Validation: Salt spray testing, load testing, and wear testing
Technical Specifications & Performance Data
Square Nut Specifications & Torque Values
| Nut Size | Thread Pitch | Across Flats | Thickness | Proof Load | Recommended Torque | Weight (g) |
|---|---|---|---|---|---|---|
| M3 | 0.5mm | 5.5mm | 2.4mm | 1200 N | 0.8-1.2 Nm | 0.4 |
| M4 | 0.7mm | 7mm | 3.2mm | 2500 N | 1.8-2.5 Nm | 1.0 |
| M5 | 0.8mm | 8mm | 4.0mm | 4000 N | 3.5-4.5 Nm | 1.8 |
| M6 | 1.0mm | 10mm | 5.0mm | 6000 N | 6.0-8.0 Nm | 3.5 |
| M8 | 1.25mm | 13mm | 6.5mm | 10000 N | 14-18 Nm | 8.0 |
| M10 | 1.5mm | 17mm | 8.0mm | 16000 N | 28-35 Nm | 16.5 |
| M12 | 1.75mm | 19mm | 10.0mm | 23000 N | 45-55 Nm | 26.0 |
| M16 | 2.0mm | 24mm | 13.0mm | 42000 N | 100-120 Nm | 55.0 |
Square Nut Advantages & Applications
| Feature | Advantage | Applications |
|---|---|---|
| Four Flat Sides | Prevents rotation in square holes | Woodworking, Furniture |
| Large Bearing Surface | Better load distribution | Structural Applications |
| Easy Wrenching | Multiple wrench engagement points | Maintenance, Assembly |
| Corner Design | Bites into soft materials | Wood, Plastic, Soft Metals |
| Simple Design | Cost-effective manufacturing | High-Volume Applications |
Surface Finishes & Coatings
Available Finishes & Specifications
| Finish Type | Thickness | Salt Spray Resistance | Appearance | Applications |
|---|---|---|---|---|
| Natural Brass | N/A | 96 hours | Golden Yellow | Indoor, Decorative |
| Polished Brass | N/A | 96 hours | Mirror Finish | Furniture, Marine |
| Nickel Plated | 5-15μm | 200-300 hours | Silver White | Industrial, Marine |
| Chrome Plated | 10-20μm | 300-500 hours | Bright Silver | Marine, Automotive |
| Tin Plated | 3-10μm | 150-200 hours | Dull Silver | Electrical, Food Grade |
| Antique Brass | N/A | 120 hours | Dark Brown | Architectural, Decorative |
International Standards & Certifications
Global Compliance & Approvals
ISO 4036: Square nuts, style 1 – Product grades A and B
DIN 557: Square nuts
ANSI B18.2.2: American standard for square nuts
ASTM B16: Standard specification for free-cutting brass rod, bar, and shapes
RoHS Compliance: Restriction of hazardous substances
REACH Compliance: European chemicals regulation
Testing & Certification Standards
Mechanical Testing: Torque testing per ISO 898-2
Corrosion Testing: Salt spray testing per ASTM B117
Dimensional Inspection: Thread gauging per ISO 1502
Load Testing: Proof load testing per ISO 898-2
Material Certification: Mill certificates with full traceability
Industry Applications
Furniture & Woodworking
Furniture Assembly: Secure fastening in wooden structures
Cabinet Making: Reliable connections in cabinetry
Joinery Applications: Strong fastening in wood joints
Fixture Installation: Secure mounting of hardware components
Electrical & Electronics
Control Panels: Secure fastening in electrical enclosures
Busbar Supports: Electrical connections in distribution systems
Grounding Applications: Reliable connections in earthing systems
Equipment Mounting: Secure installation of electrical devices
Industrial Machinery
Machine Assembly: Secure fastening in equipment manufacturing
Jig and Fixture: Reliable positioning in workholding systems
Structural Framing: Strong connections in framework assemblies
Maintenance Applications: Reliable fastening for repair work
Installation Guidelines & Maintenance
Professional Installation Procedure
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Hole Preparation: Ensure square hole matches nut dimensions
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Nut Selection: Choose appropriate size and grade for application requirements
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Insertion: Press or hammer nut into prepared square hole
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Thread Engagement: Start bolt threads carefully to prevent cross-threading
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Torque Application: Use calibrated torque wrench with specified values
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Final Inspection: Verify proper seating and anti-rotation security
Maintenance Best Practices
Regular Inspection: Visual inspection for corrosion, damage, or loosening
Torque Verification: Periodic torque check in critical applications
Corrosion Monitoring: Regular assessment in harsh environments
Surface Cleaning: Appropriate cleaning methods for different finishes
Replacement Schedule: 20+ year service life with proper installation
Frequently Asked Questions
Q1: What are the main advantages of square nuts over hex nuts?
Square nuts offer better anti-rotation characteristics in square holes, larger bearing surface for load distribution, easier wrenching with multiple engagement points, and better biting action in soft materials like wood and plastic.
Q2: Can square nuts be used in round holes?
While square nuts are designed for square holes, they can be used in round holes if properly secured. However, for round hole applications, we recommend using our square nuts with integrated washers or special retaining features.
Q3: What is the temperature rating for brass square nuts?
Standard brass square nuts are rated for continuous service from -40°C to 120°C. For higher temperature applications up to 200°C, we recommend our naval brass or special high-temperature alloys with appropriate heat treatment.
Q4: Do you provide square nuts with left-hand threads?
Yes, we manufacture brass square nuts with left-hand threads in most standard sizes. Custom thread specifications including left-hand, special pitches, and non-standard diameters are available with minimum order quantities.
Q5: What is the expected service life of your brass square nuts?
Our brass square nuts have a service life expectancy of 20+ years in standard applications and 15+ years in harsh environments when properly installed and maintained, depending on the specific alloy and environmental conditions.
Q6: What testing do you perform on finished square nuts?
We perform 100% dimensional inspection, thread gauge verification, visual examination, corner sharpness check, and sample mechanical testing. Additionally, we conduct corrosion testing, load testing, torque-tension testing, and material verification for quality assurance.
Contact Us Today – Request Quote for Brass Square Nuts
Ready to discuss your Brass Square Nut requirements for furniture manufacturing, woodworking applications, electrical equipment, or custom fastening solutions?
Request a Quote: Send your specifications including nut size, thread type, pattern type, material grade, finish, quantity, and application details to sales@jambrass.com for a detailed quotation within 24 hours.
Technical Support: Email your application requirements or technical drawings for nut selection guidance, material recommendation, and finishing assistance.
Call Us: +91-22-43449300 / +91-22-43449323 (Monday-Friday, 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
