Stainless Steel ASTM A 453 Gr.660 Class B Heavy Hex Nuts

A453 Gr660 Class B Heavy Hex Nuts — Specifications & Dimensions

A453 Gr660 Class B Heavy Hex nuts are internally threaded fasteners that mate with bolts and studs to form clamped joints. TorqBolt manufactures A453 Gr660 Class B Heavy Hex 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, A453 Gr660 Class B Heavy Hex 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

A453 Gr660 Class B Heavy Hex 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.

A286 — Iron-Nickel-Chromium Superalloy

A-286 (UNS S66286, AISI 660) is an iron-nickel-chromium age-hardenable superalloy positioned between austenitic stainless and Inconel for high-temperature bolting at 700-1300°F (370-700°C). 26% Ni + 15% Cr + 1.25% Mo with Ti-Al precipitation hardening.

A-286 is the standard for steam-turbine bolting, gas-turbine combustor cases, jet-engine shafts, and superheater bolting. Two-step heat treatment: solution at 980°C (water quench) + ageing at 720°C for 16 hours yields tensile ~895 MPa, yield ~585 MPa, elongation >15%.

A-286 fasteners ship per ASTM A453 grade 660 (classes A/B/C/D) and AMS 5731 / 5732 / 5734 / 5737 with EN 10204 3.1 / 3.2 certification and stress-rupture testing. NACE MR0175 / ISO 15156 sour-service compliance achievable in specific heat-treat conditions.

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