Hastelloy B3 Nuts

Hastelloy B3 Nuts — Specifications & Dimensions

Hastelloy B3 nuts are internally threaded fasteners that mate with bolts and studs to form clamped joints. TorqBolt manufactures Hastelloy B3 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, Hastelloy B3 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

Hastelloy B3 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.

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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