Silicon Bronze Fasteners

Silicon Bronze Fasteners, Material Overview & Form Factors

Silicon Bronze is a high-performance alloy used wherever standard fasteners cannot meet the corrosion, temperature, or strength envelope. TorqBolt manufactures the full Silicon Bronze fastener range, bolts, nuts, screws, washers, studs, and custom forgings, under one ISO 9001:2015 quality system, with PED 2014/68/EU module-H qualification for pressure-equipment service.

Where Silicon Bronze Excels

Silicon Bronze is specified in oil & gas wellhead components, refinery heat exchangers, petrochemical reactors, power-generation turbines, marine offshore platforms, and pharmaceutical / food-grade processing. Its corrosion resistance, high-temperature strength, and weldability make it the default for service conditions outside the carbon and standard-stainless envelope.

Form Factors Available

Standards & Certification

Silicon Bronze fasteners are supplied with EN 10204 3.1 (mill cert) or 3.2 (third-party witnessed) material test reports as standard. Additional certification packages: NACE MR0175 / ISO 15156, NORSOK M-650, API 6A (wellhead), API 20E (subsea bolting), PED 2014/68/EU. Third-party inspection by TUV, Lloyd's, BV, DNV, SGS, and Intertek arrangeable on order.

Bronze Alloys (Phosphor, Silicon, Aluminium, Gunmetal, Leaded)

Bronze alloys are copper-based alloys with tin, aluminium, silicon, manganese, or phosphorus additions. Excellent bearing properties, marine corrosion resistance, and non-sparking + non-magnetic characteristics.

Phosphor bronze combines high yield + fatigue with seawater corrosion resistance. Silicon bronze (C65500) is marine-grade weldable. Aluminium bronze (C95400/C95500/C95800) achieves yield ~310-585 MPa with cavitation resistance, the workhorse for marine pump impellers and propeller hub bolting. Gunmetal is the historic naval bronze for valves and trim.

Bronze fasteners ship per ASTM B98 (rod/bar) and B584 (cast) with EN 10204 3.1 / 3.2 certificates and ASTM B66 ammonia stress-corrosion testing where service warrants.

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