Hastelloy B2 Screws

Hastelloy B2 Screws — Specifications & Dimensions

Hastelloy B2 screws are externally threaded fasteners typically driven into a tapped hole. TorqBolt manufactures Hastelloy B2 screws per ASME B18.3 (socket products), ASME B18.6.3 (machine screws), DIN 912 / 7991 / 6912, and ISO 4762 / 10642, in metric M3–M48 and imperial 0–1/2".

Drive Types

Head Styles

Hastelloy B2 screws are available in cap, button, countersunk / flat (82° or 90°), pan, fillister, truss, and shoulder configurations.

Specialty Screws

TorqBolt produces Hastelloy B2 set screws (cup-point, cone-point, dog-point, flat-point, hex-socket DIN 913/914/915/916), shoulder screws, and self-tapping screws. Each lot certified per EN 10204 3.1 / 3.2 with optional NACE MR0175 sour-service compliance.

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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