Phosphor Bronze Hex Bolts

Comprehensive Overview of High-Performance Phosphor Bronze Hex Bolts

We are a specialized manufacturer and global exporter of Phosphor Bronze Hex Bolts, engineered for applications demanding a unique combination of high strength, exceptional corrosion resistance, and non-sparking safety. With over three decades of expertise in non-ferrous fastener manufacturing, we produce hex bolts from premium phosphor bronze alloys, including C51000 Phosphor Bronze A for its excellent spring and fatigue properties, C52100 Phosphor Bronze C for superior strength and wear resistance, and C54400 Free-Cutting Phosphor Bronze for complex machined parts. Our state-of-the-art cold heading and thread rolling facility ensures precise dimensions, high tensile strength, and superior surface finish for every bolt, manufactured under a quality system compliant with ISO 9001:2015.

Phosphor Bronze Hex Bolts – Engineered for Demanding Environments

Phosphor Bronze Hex Bolts are fasteners known for their high tensile strength, excellent fatigue and wear resistance, and immunity to corrosion from moisture, seawater, and industrial atmospheres. The hexagonal head allows for high torque application, making them suitable for critical, high-integrity joints.

Applications of Phosphor Bronze Hex Bolts

• Marine & Shipbuilding: Critical fastenings on decks, hulls, propellers, and offshore platforms where saltwater corrosion is a constant threat.

• Electrical & Electronics: Busbar connections, transformer terminals, and electrical panel assembly where non-magnetic properties and good conductivity are essential.

• Chemical Processing: Reactors, piping, and equipment in plants exposed to corrosive chemicals and acids.

• Water Management: Valves, pumps, and gates in water treatment and desalination plants.

• Mining & Quarrying: Equipment in explosive atmospheres where non-sparking tools and fasteners are mandatory for safety.

Phosphor Bronze Alloy Specifications for Hex Bolts

Phosphor Bronze Hex Bolt Technical Specifications

Standard Sizes: M4 to M48, #8 to 1-1/2″ diameter. Lengths from 10mm to 300mm+.
Threads: Metric Coarse, Metric Fine, UNC, UNF, BSW, BSF. Custom threads available.
Standards: ASTM B124, ASME B18.2.1, ISO 4014, ISO 4017, DIN 933, DIN 931.

Manufacturing Processes & Quality Control

Our Phosphor Bronze Hex Bolts are manufactured through a controlled process to ensure grain structure integrity and dimensional precision:

1. Wire Drawing: High-quality phosphor bronze wire is drawn to precise diameters.

2. Cold Heading: The bolt blank is formed under high pressure in multi-station cold heading machines to create the hex head and shank. This process creates a stronger bolt than machining.

3. Thread Rolling: Precise threads are formed by rolling the blank between dies. This cold-forming process work-hardens the threads, resulting in superior strength and surface finish compared to cut threads.

4. Heat Treatment (Stress Relieving): For certain applications, bolts may undergo stress relieving to minimize internal stresses and prevent stress corrosion cracking.

5. Deburring & Finishing: Bolts are tumbled to remove sharp edges and ensure a smooth finish.

6. Quality Inspection: 100% dimensional checks, sample lot testing for mechanical properties, and visual inspection.

7. Packaging: Packed in corrosion-inhibiting packaging for export.

Quality Assurance Tests:

• Dimensional Verification: Go/No-Go gauges for threads, micrometer checks for head dimensions, length, and shank diameter.

• Proof Load Testing: Sample bolts are tested to a specified proof load (typically 2x Working Load Limit) without permanent deformation.

• Tensile Testing: Destructive testing on sample lots to verify ultimate tensile and yield strength.

• Hardness Testing: Rockwell or Vickers hardness tests to verify material temper.

• Material Certification: Mill Test Certificates (MTC) provided for all raw material lots, confirming alloy composition per ASTM B103/B139.

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

Frequently Asked Questions (FAQ)

Q1: What are the key advantages of Phosphor Bronze Hex Bolts over standard steel bolts?
The key advantages are corrosion resistance (they will not rust), non-sparking properties (critical in explosive atmospheres), non-magnetic properties (essential for electrical and MRI applications), and excellent resistance to fatigue and wear. They also have good galling resistance.

Q2: How does C52100 differ from C51000 for hex bolt applications?
C52100 has a higher tin content (8% vs. 5%), which gives it higher tensile strength, yield strength, and hardness. It is the preferred choice for heavy-duty applications, such as large marine fittings or high-load structural connections, where maximum mechanical performance is required.

Q3: Can you supply matching Phosphor Bronze Hex Nuts?
Yes, we are a full-service manufacturer and can supply matching phosphor bronze hex nuts in the same alloy as your bolts. This ensures optimal performance and prevents galvanic corrosion between the bolt and nut. We provide nuts per standards like ASME B18.2.2, ISO 4032, and DIN 934.

Q4: What is the maximum working temperature for these bolts?
Phosphor bronze bolts retain their strength at elevated temperatures better than many aluminum alloys. They are generally suitable for continuous service up to 250°C (480°F). For higher temperatures, specific high-temperature copper alloys should be considered.

Q5: Do you offer different finishes or platings on phosphor bronze bolts?
Typically, phosphor bronze bolts are used bare due to their inherent corrosion resistance and attractive gold-like appearance. However, we can provide electro-tin or nickel plating for specific aesthetic requirements, added corrosion protection, or to minimize galvanic corrosion when mating with aluminum.

Why Choose Our Phosphor Bronze Hex Bolts?

• Deep Metallurgical Knowledge: We understand the nuances of phosphor bronze alloys and can recommend the optimal grade (C51000, C52100, C54400) for your specific stress, wear, and environmental conditions.

• Precision Cold Forming: Our cold heading and thread rolling process creates bolts with superior grain flow, resulting in higher fatigue life and tensile strength compared to machined bolts.

• Complete Traceability: From certified phosphor bronze wire to finished bolts, we maintain full traceability and provide all necessary documentation, including MTCs and test reports.

• Full Range of Sizes & Threads: We cater to both metric and imperial standards and can produce custom diameters, lengths, and thread pitches.

• Competitive Global Pricing: As a manufacturer based in India, we offer high-quality phosphor bronze fasteners at competitive prices, providing excellent value for global customers.

Call to Action – Contact Us Today

Secure your critical applications with the reliability of high-performance phosphor bronze hex bolts. Contact us for a prompt quote or technical consultation.

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

• Call Us Directly: Speak with our fastener experts 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: Contact us to request samples for your evaluation and testing.

We look forward to providing you with the highest quality phosphor bronze hex bolts for your most demanding applications.