Stainless Steel A182 F44 Studbolts

A182 F44 Stud Bolts — Specifications & Dimensions

A182 F44 stud bolts are double-end threaded rods used in flanged-joint pressure-vessel and piping assemblies. TorqBolt manufactures A182 F44 stud bolts per ASTM A193 (alloy steel) / ASTM A453 (high-temperature) / EN 10269, in diameters from 1/4" to 4" and lengths from 25 mm to 3 m.

End Configurations

Thread & Length

A182 F44 stud bolt threads per ASME B1.1 (UNC for <1", 8UN for ≥1.125", per ASME B16.5 §A); ISO metric on request. Length under nut measured per ASME B16.5 Annex A. Standard end-chamfer 45° for thread protection in handling.

Mechanical & Certification

A182 F44 stud bolts ship with matching ASTM A194 nuts (2H, 7, 7M, 16 grades) per the parent stud spec. Each lot includes EN 10204 3.1 / 3.2 certificates with chemistry, mechanicals, hardness, and through-hardness traverse testing per ASTM A370. NACE MR0175 / ISO 15156 sour-service certification standard. Pre-stretched / pre-loaded studs supplied per customer specification.

Duplex & Super Duplex Stainless Steels

Duplex stainless steels have ~50/50 ferrite-austenite microstructure, doubling yield strength of 304/316 grades while improving chloride pitting resistance.

Duplex 2205 (UNS S32205) is standard with PREN ~35. Super Duplex 2507 (S32750) and Zeron 100 (S32760) push PREN to 41-42. SA-182 F51 / F53 / F55 / F60 are the ASME forged-flange equivalents.

Phase balance is critical: ferrite must stay 35-65% in weld + HAZ (ASTM A923 testing). Solution anneal at 1040-1100°C followed by water quench. Fasteners ship per ASTM A276 / A479 with EN 10204 3.1 / 3.2 certs including ferrite count and Charpy at -46°C.

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