Silicon Bronze C651 Washers

Silicon Bronze C651 Washers, Specifications & Dimensions

Silicon Bronze C651 washers distribute clamp load over a wider bearing area. TorqBolt manufactures Silicon Bronze C651 washers per ASME B18.21.1 / B18.22.1, DIN 125 / 126 / 127 / 9021, and ISO 7089 / 7090 / 7093 / 7094, in metric (M3–M100) and imperial (#4–4") sizes.

Plain Washer Dimensions

Silicon Bronze C651 plain washers are characterized by ID (clearance), OD (load distribution area), and thickness. Standard tolerances h13 on OD, H13 on ID per ISO 286-2; flatness and parallelism 0.05 mm/100 mm verified per lot.

Form Variants

Hardness & Surface

Silicon Bronze C651 washers are hardness-controlled to balance load-distribution stiffness against surface damage. Typical Vickers HV: plain 140–180; spring 380–440; Belleville 460–540. Surface finish Ra 1.6 µm or better. EN 10204 3.1 / 3.2 certs standard; NACE MR0175 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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