Stainless Steel ASTM A 453 Gr.660 Class A Hex Bolts

A453 Gr660 Class A Bolts — Specifications & Dimensions

A453 Gr660 Class A bolts are externally threaded fasteners with an integral head, manufactured per ASME B18.2.1, ISO 4014/4017, and DIN 933/931. TorqBolt produces A453 Gr660 Class A 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

A453 Gr660 Class A 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

A453 Gr660 Class A 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.

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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