Silicon Bronze Socket Head Screws & Grub Screws – Manufacturer, Supplier & Exporter | Conex India

Conex Screws and Fasteners is a leading manufacturer and exporter of Silicon Bronze Socket Head Screws and Silicon Bronze Grub Screws (also known as Silicon Bronze Set Screws or Silicon Bronze Socket Set Screws) from Jamnagar, India. With over 30 years of precision fastener manufacturing experience, we supply silicon bronze screws to customers across the USA, UK, Australia, Europe, Canada, the Middle East, and beyond. Silicon bronze fasteners are the premier choice for marine, architectural, and chemical processing applications requiring exceptional corrosion resistance combined with high strength.

What Is Silicon Bronze?

Silicon Bronze is a copper alloy containing approximately 96% copper, 3% silicon, and small amounts of manganese or zinc. It combines the excellent corrosion resistance of copper with significantly higher strength than pure copper, making it ideal for demanding marine, architectural, and industrial applications. Silicon bronze offers outstanding weldability, excellent machinability, and a beautiful golden-brown appearance that weathers gracefully in outdoor environments.

What Are Silicon Bronze Socket Head Screws?

Silicon Bronze Socket Head Cap Screws feature a cylindrical head with an internal hexagonal (Allen key) drive. They are manufactured from C65100 or C65500 silicon bronze alloy and are used extensively in boat building, dock hardware, wooden structures, architectural metalwork, and marine electrical systems. Their superior corrosion resistance in salt water environments far exceeds that of standard 316 stainless steel in many conditions.

What Are Silicon Bronze Grub Screws?

Silicon Bronze Grub Screws are fully threaded, headless fasteners used to secure collars, hubs, and pulleys onto shafts. These Silicon Bronze Set Screws are driven by an Allen (hex) key and are available with cup point, flat point, dog point, and cone point configurations. Their non-sparking and corrosion-resistant properties make them ideal for marine and offshore applications.

Material Grades & International Equivalents

Size & Dimensional Chart – Metric Socket Head (ISO 4762 / DIN 912)

Size & Dimensional Chart – Inch UNC (ASME B18.3)

Key Features & Performance Metrics

• Corrosion Resistance: Excellent in seawater, salt spray, and marine environments – superior to 316 SS in many conditions
• Tensile Strength: 400–550 MPa (C65500 – High Silicon Bronze A)
• Yield Strength: 170–240 MPa depending on temper
• Hardness: 80–100 HRB
• Non-Magnetic: Ideal near sensitive instrumentation
• Non-Sparking: Safe in explosive atmospheres and flammable environments
• Thermal Conductivity: 36 W/m·K
• Electrical Conductivity: 7% IACS
• Operating Temperature: -200°C to +200°C
• Weldability: Excellent – silicon bronze is one of the most weldable copper alloys

Applications

Silicon Bronze Socket Head Screws and Grub Screws are widely used in marine boat building and yacht construction, dock and harbour hardware, underwater ROV and instrumentation, wooden structure fastening (decking, pergolas, boardwalks), architectural metalwork and cladding, chemical processing equipment, offshore oil and gas platforms, water treatment plants, food processing equipment, and marine electrical systems.

Why Choose Conex Over Other Manufacturers?

• 30+ Years of Experience: Three decades of specialised copper alloy fastener manufacturing from Jamnagar, India
• Faster Turnaround: Standard orders ready in 7–14 working days; urgent shipments accommodated
• Superior Customer Support: Dedicated account managers, responsive across all time zones
• Excellent Communication: English-fluent technical team provides prompt RFQ responses and material guidance
• Global Exposure: Regular exporters to USA, Australia, UK, Canada, UAE, Germany, and 50+ countries
• Competitive Pricing: Direct factory pricing with no intermediaries
• Full Documentation: MTC, CoC, RoHS, and REACH compliance certificates provided
• Custom Capability: Special alloys, non-standard sizes, custom finishes, and private labelling available

Our Flexibility to Customise

We manufacture silicon bronze screws in custom thread forms (Metric, UNC, UNF, BSW, BSF), non-standard head styles, special drive types, custom lengths and diameters, and special surface treatments. We can also supply silicon bronze fasteners to customer-supplied drawings and specifications. Both small prototype quantities and large production runs are accommodated.

What Separates Conex from Other Manufacturers

Conex is a direct manufacturer – not a trader or stockist. Our in-house cold forging, thread rolling, and CNC turning capabilities allow us to produce precise, consistent silicon bronze fasteners to international standards. We maintain full traceability from raw material to finished product, supported by comprehensive quality documentation. Our dedicated export team ensures smooth logistics for customers in the Americas, Europe, Oceania, and Asia.

Export-Worthy Packaging

• Inner: Polybags sealed and sorted by size and specification
• Outer: Heavy-duty double-wall corrugated export cartons
• Labelling: Full identification on every carton – part number, alloy, size, quantity, batch, and origin
• Moisture protection: Desiccant packs included for sea freight shipments
• Palletisation: ISPM-15 compliant heat-treated wooden pallets for full container load shipments

Technical Q&A – Silicon Bronze Socket Head Screws & Grub Screws

Q1. What are silicon bronze socket head screws used for?
A: Silicon bronze socket head screws are primarily used in marine and boat building applications, wooden structure fastening, architectural metalwork, and chemical processing equipment where high corrosion resistance and attractive appearance are required. They are the preferred fastener for wooden boat construction.

Q2. How does silicon bronze compare to stainless steel for marine use?
A: Silicon bronze typically outperforms 316 stainless steel in highly oxygenated seawater, in crevice corrosion resistance, and in galvanic compatibility with copper-based systems (such as copper alloy fittings and bronze through-hulls). Stainless steel can suffer crevice corrosion in stagnant seawater conditions, while silicon bronze does not.

Q3. What grade of silicon bronze is used for your fasteners?
A: We primarily use C65500 (High Silicon Bronze A – 97% Cu, 3% Si) conforming to ASTM B98 and UNS C65500. This grade offers the best combination of strength (tensile strength 400–550 MPa) and corrosion resistance for marine and structural applications.

Q4. Are silicon bronze grub screws available in UNC thread?
A: Yes. We supply silicon bronze set screws (grub screws) in both metric and UNC/UNF thread forms to meet American boat building and marine hardware specifications.

Q5. What point styles are available for silicon bronze grub screws?
A: We supply silicon bronze grub screws with cup point (most common for shaft locking), flat point, dog point (for permanent shaft positioning), cone point (for hard materials), and knurled cup point variants.

Q6. Are silicon bronze fasteners non-magnetic?
A: Yes. Silicon bronze is a non-magnetic alloy, making silicon bronze socket head screws and grub screws suitable for compass mounts, electronic navigation equipment, and sensitive instrumentation on vessels and offshore platforms.

Q7. What is the corrosion resistance of silicon bronze in seawater?
A: Silicon bronze offers excellent resistance to seawater, salt spray, and atmospheric marine corrosion. It does not suffer from pitting or crevice corrosion in the way that austenitic stainless steels can. Silicon bronze is widely regarded as the optimal fastener material for wooden boat construction and marine joinery.

Q8. Can silicon bronze screws be welded?
A: Yes. Silicon bronze has excellent weldability using TIG (GTAW) or MIG (GMAW) welding with matching silicon bronze filler wire. This makes silicon bronze socket head screws and related fasteners useful in fabricated marine assemblies.

Q9. What is the minimum order quantity for silicon bronze screws?
A: We supply from as low as 100 pieces for samples and prototypes, up to full container load quantities for production requirements. Please contact our sales team with your specifications for a competitive quotation.

Q10. Do you supply silicon bronze screws with material test certificates?
A: Yes. Material Test Certificates (MTC) with chemical composition analysis and mechanical test data are provided for all export orders. EN 10204 Type 3.1 certificates are available on request.

Q11. What standards do your silicon bronze socket head screws conform to?
A: Our silicon bronze socket head cap screws conform to ISO 4762 and DIN 912 (metric) and ASME B18.3 (inch). Material conforms to ASTM B98 (C65500). Grub screws conform to ISO 4026–4029 and DIN 913–916.

Q12. Are silicon bronze screws RoHS compliant?
A: Yes. Silicon bronze C65500 is free from all RoHS-restricted substances. We provide RoHS compliance declarations with each export shipment.

Q13. What is the lead time for silicon bronze screws from Conex?
A: Standard sizes are typically dispatched within 7–14 working days. Custom dimensions or special specifications may require 3–4 weeks production time. Contact us for urgent requirement scheduling.

Q14. Can silicon bronze screws be used in contact with aluminium?
A: Caution is required. Silicon bronze and aluminium have a galvanic potential difference and can cause galvanic corrosion when in direct contact in the presence of electrolytes. An insulating barrier or compatible sealant is recommended when using silicon bronze fasteners with aluminium structures.

Q15. Do you offer custom silicon bronze fastener specifications?
A: Absolutely. Conex specialises in custom silicon bronze fasteners to customer drawings and specifications, including non-standard diameters, thread pitches, head styles, and special surface treatments. MOQ for custom items starts at 500 pieces. Contact us to discuss your requirements.

Customer Testimonials

Michael Thornton, Marine Surveyor – Sydney, Australia
“Conex has been our go-to supplier for silicon bronze fasteners for wooden boat restorations and new builds for over five years. The quality is consistent, the MTC documentation is always in order, and their communication is excellent. Highly recommended for anyone in the marine industry.”

David Hartmann, Procurement Engineer – Hamburg, Germany
“We sourced a large batch of silicon bronze socket head cap screws to DIN 912 and ASTM B98 from Conex for an offshore instrumentation project. Delivery was on schedule, quality was to specification, and the price was very competitive. We will definitely use Conex again.”

Glossary of Related Terms

Silicon Bronze: A copper alloy with 3% silicon offering high strength and excellent marine corrosion resistance | C65500: UNS designation for High Silicon Bronze A – the primary grade for marine fasteners | Socket Head Cap Screw: Cylindrical-head fastener with internal hexagonal drive | Grub Screw: Headless, fully threaded set screw driven by Allen key | ASTM B98: American standard for silicon bronze rod, bar, and shapes | DIN 912: German standard for socket head cap screws | Cup Point: The most common grub screw tip, providing positive shaft engagement | Crevice Corrosion: Corrosion occurring in shielded areas – silicon bronze resists this unlike some stainless grades | Non-Sparking: Property of silicon bronze preventing ignition sparks | MTC: Material Test Certificate confirming material composition and mechanical properties

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Request a Quote for Silicon Bronze Socket Head Screws & Grub Screws

Looking for a reliable manufacturer and exporter of Silicon Bronze Socket Head Screws and Silicon Bronze Grub Screws? Contact Conex today for competitive pricing, fast delivery, full documentation, and expert technical support.

📧 Email us at sales@conexscrews.com | 📞 Call us at +91-22-43449323 | 🌐 Request a Quote Online