Silicon Bronze C651 Nuts

Silicon Bronze C651 Nuts — Specifications & Dimensions

Silicon Bronze C651 nuts are internally threaded fasteners that mate with bolts and studs to form clamped joints. TorqBolt manufactures Silicon Bronze C651 nuts per ASME B18.2.2, ISO 4032/4033/4034, DIN 934/EN 24032, and DIN 6915 (heavy hex), in sizes M6–M100 and 1/4"–4".

Nut Height Categories

Locking Variants

For vibration-loaded joints, Silicon Bronze C651 nuts are available as nyloc, all-metal prevailing-torque (DIN 980), flange-serrated (DIN 6923), and castle / slotted (DIN 935, cotter-pin retention).

Mechanical & Certification

Silicon Bronze C651 nut threads are gauged per ASME B1.1 / ISO 965 to Class 2B / 6H. Proof-load testing per ASTM F606 verifies the nut develops the bolt's full strength without thread strip. Each lot ships with EN 10204 3.1 / 3.2 certificates. NACE MR0175 / ISO 15156 sour-service certification available.

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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