Silicon Bronze C655 Bolts

Silicon Bronze C655 Bolts, Specifications & Dimensions

Silicon Bronze C655 bolts are externally threaded fasteners with an integral head, manufactured per ASME B18.2.1, ISO 4014/4017, and DIN 933/931. TorqBolt produces Silicon Bronze C655 bolts in metric (M6–M100) and imperial (1/4"–4") diameters with custom lengths from 10 mm up to 3000 mm.

Head Styles Available

Thread & Shank

Silicon Bronze C655 bolts are supplied with full or partial threading. Full-thread (UNC, UNF, ISO metric coarse/fine) for tension-only joints; partial-thread shank for shear loads. Thread fits per ASME B1.1 (Class 2A) or ISO 965 (6g) by default; tighter Class 3A / 4h6h on request.

Mechanical & Certification

Silicon Bronze C655 bolts achieve characteristic tensile, yield, and elongation per the source-material spec, with proof-load testing and hardness verification per ASTM F606 / ISO 898-1. Each lot ships with EN 10204 3.1 (or 3.2) certificates listing chemistry, mechanicals, hardness, and dimensional inspection. NACE MR0175 / ISO 15156 sour-service certification on request.

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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