ASTM A307 Bolts

ASTM A307 Bolts — Specifications & Dimensions

ASTM A307 bolts are externally threaded fasteners with an integral head, manufactured per ASME B18.2.1, ISO 4014/4017, and DIN 933/931. TorqBolt produces ASTM A307 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

ASTM A307 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

ASTM A307 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.

ASTM Carbon & Alloy Steel Bolting Specifications

The ASTM A193 / A194 / A320 / A325 / A490 / F568 family covers carbon and low-alloy steel bolting standards for pressure vessels, structural steel, and high-temperature service.

ASTM A193 Grade B7 is the workhorse: AISI 4140 chrome-moly, quench + temper to 105 ksi yield min — the default for ASME flanged-joint stud bolts to 500°C. B7M is hardness-controlled (≤ HRC 22) for sour service. B16 uses Cr-Mo-V for service to 600°C. ASTM A320 L7 / L7M / L43 are cryogenic variants per Charpy at -101°C. A194 grade 2H / 7 / 7M / 16 are matching nut grades.

EN 10204 3.1 / 3.2 certificates standard, with hardness, tensile, Charpy, and through-hardening checks per the lot release procedure.

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