ASTM F3148 Bolts

ASTM F3148 Bolts, Specifications & Dimensions

ASTM F3148 bolts are Grade 144 fixed-spline structural bolts with a round head to ASME B18.2.6 (all dimensions except spline geometry), supplied as assemblies with an ASTM A563 DH (DH3 for Type 3) heavy hex nut and an ASTM F436 washer. ASTM F3148 covers nominal diameters 1/2 to 1-1/4 in. inclusive, in inch dimensions only.

Head Style

Thread & Shank

ASTM F3148 bolts have UNC threads to ASME B1.1 Class 2A, rolled or cut. Thread length shall not be changed except as provided in Supplementary Requirement S1.

Mechanical & Certification

ASTM F3148 bolts have 144 ksi minimum tensile strength, 115 ksi minimum yield (machined specimen), 14% elongation, 35% reduction of area and 31 to 35 HRC, tested per ASTM F606/F606M; assemblies are also tension tested to ASTM F3148 Table 5. 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.

: specification facts on this page checked against ASTM F3148.

Specialty Fastener Alloys

TorqBolt manufactures specialty fasteners across the full range of corrosion-resistant alloys, high-temperature superalloys, and engineered metallurgies required by process industries. Beyond high-volume Inconel, Hastelloy, Duplex, and stainless grades, our supply chain covers the long tail of specification-driven alloys for unique service envelopes.

Each specialty alloy is sourced from approved mills with full melt traceability through a closed forging route. Heat-treat condition, mechanical properties, and corrosion testing are controlled to the customer's drawing or governing specification, ASTM, ASME, AMS, MIL, NORSOK, NACE, or proprietary end-user codes. EN 10204 3.1 / 3.2 material test certificates issued with every lot.

Third-party inspection by TUV, Lloyd's, BV, DNV, SGS, and Intertek arrangeable. NACE MR0175 / ISO 15156, NORSOK M-650, API 6A, API 20E, and PED 2014/68/EU compliance available across the alloy range.

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