Stainless Steel ASTM A 453 Gr.660 Class D Threaded Bars

A453 Gr660 Class D Threaded Bars — Specifications & Dimensions

A453 Gr660 Class D threaded bars (also called threaded rods or all-thread bars) are continuously threaded rod stock used as anchor bolts, hanger rods, U-bolts, custom stud bolts, and structural tie-rods. TorqBolt manufactures A453 Gr660 Class D threaded bars per ASTM A193 / A320 / A354 / A540 / EN 10269, in diameters from M6 / 1/4" up to M100 / 4" and lengths up to 3 metres.

Thread Patterns

Length & Custom Cuts

A453 Gr660 Class D threaded bar stock is supplied in standard 1 m, 2 m, 3 m mill lengths or custom-cut to drawing. End chamfer per customer drawing (45° standard for thread protection). Bend-and-thread combinations (J-bolts, U-bolts, eye-rod) available on request.

Mechanical & Certification

A453 Gr660 Class D threaded bars achieve the parent material's full mechanical envelope — tensile, yield, hardness per the heat-treat condition. EN 10204 3.1 / 3.2 certificates standard, including through-length straightness (max 1.5 mm/m) and coating-thickness verification where applicable. 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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