Bronze Washers

Comprehensive Overview of Precision Bronze Washers

We are a premier manufacturer and global supplier of precision Bronze Washers, serving industries where corrosion resistance, non-sparking properties, and durability are paramount. With decades of experience in non-ferrous metal stamping and machining, we produce a comprehensive range of washers from high-performance bronze alloys. Our product line includes Bronze Flat Washers for even load distribution, Bronze Spring Washers for vibration resistance, and custom-machined Bronze Thrust Washers. Utilizing alloys such as C95400 Aluminum Bronze for high strength, C93200 Bearing Bronze for excellent machinability, and C52100 Phosphor Bronze for superior spring properties, we ensure the right washer for every critical application. Our manufacturing process is certified under ISO 9001:2015, guaranteeing consistent quality and full traceability.

Bronze Flat Washers – For Load Distribution & Corrosion Resistance

Bronze Flat Washers are simple yet critical components used to distribute the load of a threaded fastener, prevent surface damage, and provide a smooth bearing surface. Their primary advantage over steel is their inherent corrosion resistance and non-sparking nature.

Applications of Bronze Flat Washers

• Marine & Offshore: Under bolt heads and nuts on decks, hulls, and offshore structures to prevent galvanic corrosion and distribute load.

• Chemical Processing: Equipment assembly in plants where chemical spills would corrode standard steel washers.

• Water Treatment: Valves, pumps, and pipe flanges in contact with water and treatment chemicals.

• Architectural Hardware: As a decorative and functional element in bronze fittings and fixtures.

• Electrical Panels: Used as non-magnetic, conductive washers in electrical connections.

Bronze Alloy Specifications for Flat Washers

Bronze Flat Washer Technical Specifications

Standard Sizes: M3 to M100, #4 to 4″ nominal bolt sizes. Custom OD/ID/Thickness available.
Standards: Can be manufactured to conform to ISO 7089, ISO 7090, DIN 125, and ASME B18.22.1.

Bronze Spring Washers – For Vibration Resistance & Locking

Bronze Spring Washers are designed to provide a preload force in a bolted joint, preventing loosening due to vibration, thermal cycling, or other dynamic forces. Their non-magnetic and corrosion-resistant properties make them essential in specific demanding environments.

Applications of Bronze Spring Washers

• Marine Engines: Locking nuts and bolts on engines and drive systems exposed to saltwater spray.

• Pump & Valve Assemblies: Maintaining bolt tension in vibrating pumps and fluid handling systems.

• Electrical Connectors: Providing consistent contact pressure in high-current electrical connections.

• Food Processing Equipment: Where corrosion resistance and compliance with hygiene standards are required.

• Aerospace & Defense: Non-magnetic locking washers for sensitive electronic enclosures and instrumentation.

Bronze Alloy Specifications for Spring Washers

Bronze Spring Washer Technical Specifications

Types: Split Lock Washers, Bellville (Conical) Spring Washers, Finger Washers.
Standards: Can be manufactured to conform to DIN 127, DIN 128, ISO 10683, and ANSI B18.21.1.

Bronze Thrust Washers – For Axial Load Management

Bronze Thrust Washers are precision washers designed to handle high axial loads in rotating assemblies, acting as bearings for shafts and other components. They are often used in applications with low rotational speeds or oscillating motion.

Applications of Bronze Thrust Washers

• Pump Bearings: Supporting axial loads in centrifugal and gear pumps.

• Marine Steering Systems: Thrust surfaces in rudder stocks and propeller shafts.

• Heavy Machinery: Construction equipment, gearboxes, and turntables.

• Automotive Transmissions: In manual gearboxes and differentials.

Manufacturing Processes & Quality Control

Our bronze washers are produced through two primary methods:

1. Metal Stamping: For high-volume production of flat and spring washers. Process: Sheet/Coil Stock -> Blank & Pierce in Stamping Press -> Deburring -> Heat Treatment (for spring washers) -> Plating (if required) -> Inspection & Packaging.

2. CNC Machining: For low-volume, custom, or thick thrust washers. Process: Bronze Bar Stock -> CNC Turning -> Broaching (for keyways) -> Deburring -> Surface Grinding (for parallelism) -> Inspection.

Quality Assurance Tests:

• Dimensional Inspection: 100% check for OD, ID, and thickness using calibrated micrometers and gauges.

• Material Verification: Mill Test Certificates (MTC) provided for all material lots.

• Hardness Testing: Rockwell or Vickers hardness tests to verify temper and alloy properties.

• Salt Spray Testing: Periodic testing per ASTM B117 to validate corrosion resistance claims.

• Load Testing: For spring washers, load-deflection testing is performed on sample lots.

Frequently Asked Questions (FAQ)

Q1: Why should I use a bronze washer instead of a steel washer?
The primary reasons are corrosion resistance and non-sparking safety. Bronze washers will not rust in marine or chemical environments, preventing seizure and ensuring easy disassembly. In hazardous areas, they eliminate the risk of sparks caused by ferrous metals impacting each other.

Q2: What is the difference between a bronze flat washer and a bronze thrust washer?
A flat washer is typically thin and used to distribute load under a fastener. A thrust washer is thicker, often has a larger surface area, and is specifically engineered to handle significant axial (thrust) loads in a rotating assembly, functioning as a bearing surface.

Q3: Can you manufacture custom-sized or special-profile bronze washers?
Absolutely. We specialize in custom bronze stampings and machined washers. We can produce washers to your exact outside diameter, inside diameter, thickness, and with special features like keyways, grooves, or non-standard shapes. Send us your drawings for a prompt quote.

Q4: Which bronze alloy is best for a marine environment spring washer?
C52100 Phosphor Bronze is generally the best choice. It offers an excellent combination of high spring properties, fatigue resistance, and superior corrosion resistance in saltwater environments, ensuring the washer maintains its locking force over time.

Q5: Do bronze washers cause galvanic corrosion?
Bronze is noble to steel but less noble than stainless steel. When used with a carbon steel bolt, the bronze washer is typically unaffected, while the steel bolt may corrode. For best practice in severe environments, use bronze washers with bronze bolts and nuts to avoid galvanic couples entirely.

Why Choose Our Bronze Washers?

• Alloy Selection Expertise: We guide you to the optimal alloy (C93200, C95400, C52100) for your specific load, corrosion, and wear requirements.

• Dual Manufacturing Capability: We offer both high-speed stamping for cost-effective standard parts and precision machining for complex custom washers.

• Stringent Quality Control: Every batch undergoes rigorous dimensional checks, and we provide full material certification for traceability.

• Wide Range & Customization: From standard sizes to fully custom designs, we have the flexibility to meet your exact specifications.

• Global Supply Chain: We are a trusted exporter to North America, Europe, the Middle East, and Asia, with deep experience in international logistics and documentation.

Call to Action – Contact Us Today

Ensure the integrity of your assemblies with high-performance bronze washers. Contact us for a quotation or technical support.

• Request a Quote: Email your specifications, drawings, and quantities to sales@jambrass.com for a competitive quotation within 24 hours.

• Call Us Directly: Speak with our technical sales team at +91-22-43449300 / +91-22-43449323 (Monday-Saturday, 9:00 AM – 6:00 PM IST).

• Visit Our Offices:

  • 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

• Samples Available: We can provide samples of our standard washers for your evaluation and testing.

Partner with us for all your bronze washer needs and experience the difference that quality and expertise make.