ASTM A194 Gr 8 ( AISI SS 304 ) Nuts

ASTM A194 8 AISI SS 304 Nuts, Specifications & Dimensions

ASTM A194 8 AISI SS 304 nuts are internally threaded fasteners that mate with bolts and studs to form clamped joints. TorqBolt manufactures ASTM A194 8 AISI SS 304 nuts per ASME B18.2.2 (inch) or ASME B18.2.4.6M (metric), heavy hex series unless otherwise specified (ASTM A194/A194M 9.1), in sizes M12–M100 and 1/4"–4" (A194 1.1 covers austenitic nuts from 1/4 in. and M12).

Nut Height Categories

Locking Variants

ASTM A194/A194M nuts are hexagonal and either double chamfered or with a machined or forged washer face (9.1). Nuts made to other dimensions or configurations are proof load tested only when Supplementary Requirement S9 is ordered; otherwise they are cross-sectional hardness tested (8.2.1).

Mechanical & Certification

ASTM A194 8 AISI SS 304 nut threads are ASME B1.1 Class 2B or ASME B1.13M 6H, gauged per ASME B1.2 and B1.13M (9.2). Grade 8 nuts are proof load tested on a threaded mandrel or test bolt to 80 ksi (heavy hex) or 75 ksi (hex) proof stress per Tables 3 and 4, with hardness 126-300 HBW per Table 2. Each lot ships with EN 10204 3.1 / 3.2 certificates. For sour service, ISO 15156-3 (NACE MR0175) Table A.2 requires austenitic stainless steel to be solution annealed, free of cold work and 22 HRC max; Grade 8A nuts are carbide solution treated after forming (ASTM A194/A194M 6.6, 126-192 HBW per Table 2).

: specification facts on this page checked against ASTM A194/A194M, NACE MR0175 / ISO 15156, ASTM A193/A193M, ASTM A320/A320M, ISO 15156-2.

ASTM Carbon & Alloy Steel Bolting Specifications

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

ASTM A193 Grade B7 is the workhorse: AISI 4140 chrome-moly, liquid quenched and tempered at 1100°F [593°C] min, 105 ksi yield min up to 2-1/2 in. B7M is hardness-controlled (235 HBW or 99 HRB max, ASTM A193/A193M 9.2.2) and is the A193 grade listed for sour service in ISO 15156-2 Table A.4. B16 uses Cr-Mo-V steel tempered at 1200°F [650°C] min. ASTM A320 L7 / L7M / L43 are low-temperature grades, Charpy tested at -150°F [-101°C] (L7, L43) and -100°F [-73°C] (L7M). 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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