Silicon Bronze Bolts | Silicon Bronze Hex Bolts Manufacturer & Exporter

We are one of the leading manufacturers and exporters of high-performance Silicon Bronze fasteners from India. We have been supplying premium quality Silicon Bronze Hex Bolts, Cap Screws, Set Screws, and a wide range of other copper alloy fasteners to the world market for many decades. Our products are engineered to meet and exceed international standards, including ASTM, ASME, ISO, DIN, and BS, ensuring unmatched reliability in the most demanding environments. Renowned for their exceptional corrosion resistance, especially in marine and saltwater applications, our Silicon Bronze Bolts offer superior strength and excellent anti-galling properties, making them a preferred choice over standard Stainless Steel or Brass fasteners for critical applications. We serve a global clientele across industries such as shipbuilding, offshore oil & gas, chemical processing, and architectural restoration.

In-Depth Look at Our Silicon Bronze Fastener Range

Silicon Bronze Bolts (General)

Our general Silicon Bronze Bolts encompass a variety of head styles, including square head, round head, and carriage bolts, all manufactured from Alloy C65500 (according to the UNS classification) or equivalent international grades. This copper-based alloy, primarily composed of Copper with 3% Silicon and 1% Manganese, provides an excellent combination of high tensile strength, outstanding corrosion resistance, and good machinability. These bolts are typically hot-forged or cold-headed from continuous cast rods to ensure grain structure integrity and dimensional accuracy. They are the go-to solution for wood-to-wood fastening in timber frame construction, architectural metalwork, and securing components in chemical plants where non-sparking properties are beneficial.

Silicon Bronze Hex Bolts

The Silicon Bronze Hex Bolt is one of our most requested products, characterized by its hexagonal head designed for wrench tightening. Manufactured in full compliance with ASTM B98 / ASME SB-98 specifications, these bolts are available in both full-threaded and partially-threaded (dowel) configurations. They are produced on high-speed cold heading machinery and thread rolling machines to achieve precise ISO metric thread profiles (e.g., M6, M8, M10 up to M24) or Unified Thread Standard (UNC/UNF) profiles as per ANSI B18.2.1. The manufacturing process ensures tight tolerances on all dimensions, including head height, width across flats, and thread pitch diameter. A typical finish is self-colored, mill-finish, which naturally develops a protective patina over time, but other finishes like polished or lacquered are available upon request.

Silicon Bronze Hex Cap Screws

A Silicon Bronze Hex Cap Screw is distinguished from a standard hex bolt by its tighter dimensional tolerances, particularly under the head and on the body diameter, and a chamfered end. They are designed for applications where precision and a finished appearance are paramount. These cap screws are machined to meet the stringent requirements of ISO 4762 (metric) and ASME B18.2.1 (imperial). The term “cap screw” often implies a higher quality product, and ours are manufactured from certified C65500 or C65600 (higher silicon content for wear resistance) material. They are commonly used in heavy-duty marine hardware, pump assemblies, and valve manifolds where disassembly and reassembly are frequent, thanks to the alloy’s excellent anti-seize characteristics.

Silicon Bronze Hex Set Screws

Our Silicon Bronze Hex Set Screws are headless fasteners designed to secure one object within or against another. They are manufactured with a hexagonal socket (Allen drive) and are available in various point styles: cup point, flat point, cone point, and dog point. These set screws are precision-machined from Silicon Bronze round bar on CNC lathes and milling machines to ensure perfect form and function. They conform to ISO 4026 and ASME B18.3 standards. The primary application is to secure pulleys, gears, and collars onto shafts in a marine environment where corrosion would render standard Steel set screws inoperable. The non-magnetic properties of Silicon Bronze also make them ideal for use in sensitive instrumentation and electrical applications.

Technical Specifications & Data

Material Grades and International Equivalents

Typical Mechanical Properties (C65500)

Dimensional Chart for Hex Bolts/Cap Screws (ASME B18.2.1 – Inch Series)

(Illustrative Data – Full charts available on request)

Note: We manufacture in both Metric (ISO) and Imperial (ANSI) standards. Dimensions are subject to standard manufacturing tolerances.

Why Choose Our Silicon Bronze Fasteners?

For over thirty years, our name has been synonymous with quality and reliability in the global fastener market. Our global exposure and extensive experience mean we understand the nuanced requirements of different industries and regions. Here’s what sets us apart:

• Uncompromising Quality Control: Every batch of raw material is spectroscopically analyzed, and finished products undergo rigorous dimensional checks and mechanical testing.

• Customization & Flexibility: We specialize in customized non-standard sizes, special threads, and unique head markings. We offer customized packaging with your company’s labels and logo for seamless brand integration.

• Superior Customer Support & Communication: Our technical sales team provides expert guidance. We maintain excellent communication skills throughout the order process, from inquiry to delivery, ensuring you are always informed.

• Competitive Turnaround Time: Despite our meticulous processes, we maintain an efficient production flow. Our standard lead time is 4-6 weeks for most orders, which is highly competitive for custom-made, high-quality fasteners.

• Global Logistics Expertise: As experienced exporters, we handle all shipping, documentation, and customs formalities seamlessly, delivering to your port or doorstep.

Packaging and Shipping

To ensure our products reach you in pristine condition, we use robust, corrosion-inhibiting packaging like VCI paper and plastic. Options include wooden boxes, cartons, or pallets, all tailored to your needs. We ship via air or sea from our manufacturing units in India to destinations worldwide.

Performance Metrics & Applications

Industries Served: Shipbuilding & Repair, Offshore Drilling Platforms, Naval Architecture, Chemical Processing, Water Treatment, Power Generation, Architectural & Restoration Building, and Aquaculture.

Performance Highlights:

• Corrosion Resistance: Excellent resistance to saltwater, brackish water, and a wide range of chemicals.

• Strength: High tensile strength comparable to many grades of steel.

• Non-Sparking: Ideal for use in explosive atmospheres (ATEX environments).

• Non-Magnetic: Essential for applications in marine electronics and MRI facilities.

• Biocompatibility: Safe for use in desalination plants and potable water systems.

Customer Testimonials

“We’ve been sourcing Silicon Bronze Hex Cap Screws for our custom yacht fittings for five years. The quality is consistently exceptional, and they withstand the harsh Florida coast perfectly. Their team’s technical knowledge and willingness to accommodate our tight production schedules make them a valued partner.” – Michael Roberts, Naval Architect, USA

Frequently Asked Questions (Q&A)

Q1: How does Silicon Bronze compare to 316 Stainless Steel in marine environments?
A: While 316 Stainless Steel is good, Silicon Bronze is often superior in stagnant or low-oxygen seawater, as it is immune to crevice and pitting corrosion, which can plague stainless steels.

Q2: Are your bolts suitable for use in potable water systems?
A: Yes, our C65500 Silicon Bronze fasteners are compliant with standards for potable water contact and are lead-free, making them an excellent, safe choice.

Q3: Can you provide bolts with a specific certification?
A: Absolutely. We can provide 3.1 Material Certification as per EN 10204, along with test reports for chemical and physical properties.

Q4: Do you offer smaller, non-standard quantity orders?
A: Yes, we are flexible and can accommodate both large-volume projects and smaller, custom prototype orders.

Q5: What is the primary difference between a hex bolt and a hex cap screw?
A: The main differences are in the tolerances. A hex cap screw has tighter tolerances on the body diameter and the underside of the head, and it features a chamfered end, giving it a more finished appearance.

Q6: Are Silicon Bronze fasteners magnetic?
A: No, they are completely non-magnetic, which is a critical requirement in many marine and scientific applications.

Q7: What is the maximum operating temperature for these fasteners?
A: Silicon Bronze retains its strength at elevated temperatures better than many brasses. It can be used continuously in services up to approximately 250°C (480°F).

Q8: Can I get a sample before placing a bulk order?
A: Certainly. We encourage potential clients to evaluate our quality firsthand and are happy to provide sample fasteners.

Q9: What drive types do you offer for set screws?
A: We primarily manufacture hex socket (Allen) drive set screws, but other drive types can be custom-manufactured.

Q10: Do you provide CAD drawings of your products?
A: Yes, we can provide 2D and 3D CAD models for our standard product range upon request to aid in your design process.

Glossary of Terms

• Anti-Galling: A property of a material that resists friction-induced wear and seizing, common in threaded components. Silicon Bronze has excellent anti-galling properties.

• Cold Heading: A manufacturing process where metal wire is cut and formed into a bolt blank at room temperature using high pressure, creating a strong grain flow.

• Crevice Corrosion: A form of localized corrosion occurring in shielded areas (crevices) where a stagnant solution is present. Silicon Bronze is highly resistant to it.

• Patina: A thin, protective layer that forms on the surface of copper alloys over time due to oxidation, which enhances corrosion resistance.

• Thread Rolling: A process of forming threads by plastically deforming the blank between two dies, which creates stronger threads than cutting.

• UNS (Unified Numbering System): A system for classifying metals and alloys, e.g., C65500 for High-Silicon Bronze.

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Call to Action

Ready to secure your projects with the best? Contact our technical sales team today for a competitive quotation, detailed product brochures, or to discuss your specific Silicon Bronze fasteners requirement.