Hastelloy B3 Bolts

Hastelloy B3 Bolts — Specifications & Dimensions

Hastelloy B3 bolts are externally threaded fasteners with an integral head, manufactured per ASME B18.2.1, ISO 4014/4017, and DIN 933/931. TorqBolt produces Hastelloy B3 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

Hastelloy B3 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

Hastelloy B3 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.

Hastelloy — Ni-Cr-Mo / Ni-Mo Corrosion Alloys

Hastelloy is the trade designation for nickel-chromium-molybdenum (and nickel-molybdenum) alloys formulated for severe wet-corrosion service: hydrochloric, sulfuric, chloride pitting, crevice corrosion, and sour wells.

Hastelloy C-276 (UNS N10276) is the workhorse: 16% Cr, 16% Mo, 4% W — the only nickel alloy resistant to wet chlorine + hypochlorite. C-22 upgrades Cr for oxidizing-acid performance. C-2000 adds Cu for full-pH service. B-3 is Ni-Mo for hot HCl. G-35 targets phosphoric-acid plants.

Hastelloy fasteners ship per ASTM B574 / B575 with EN 10204 3.1 / 3.2 certification including PMI and intergranular-corrosion testing per ASTM G28. NACE MR0175 / ISO 15156 sour-service compliance standard.

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