At Ananka Fasteners Pvt Ltd, we manufacture and supply fasteners certified to ASTM F3148. Standard specification for high-strength structural bolt assemblies of steel and alloy steel, quenched and tempered (heat treated), 144 ksi minimum tensile strength, in inch dimensions. Covers the complete assembly of a heavy-hex structural bolt with a spline (twist-off) end furnished with a matched heavy-hex nut and washer, tested and marked as a single lot for pretensioned/slip-critical connections. Sizes 1/2 to 1-1/2 in.
Standard specification for high-strength structural bolt assemblies of steel and alloy steel, quenched and tempered (heat treated), 144 ksi minimum tensile strength, in inch dimensions. Covers the complete assembly of a heavy-hex structural bolt with a spline (twist-off) end furnished with a matched heavy-hex nut and washer, tested and marked as a single lot for pretensioned/slip-critical connections. Sizes 1/2 to 1-1/2 in.
| Grade / Class | UNS / Designation | Type / Notes |
|---|---|---|
| Grade 144 | Steel / alloy steel | Heavy-hex head, spline (twist-off) drive end; supplied as bolt-nut-washer assembly, one strength grade |
Minimum mechanical requirements per ASTM F3148.
| Grade / Class / Condition | Tensile Strength, min | Yield Strength, min | Elongation, min % | Hardness |
|---|---|---|---|---|
| Grade 144 (1/2-1-1/2 in) | 144 (993) | 130 (896) | 14 | 33-38 HRC |
| Grade | Key Composition, % |
|---|---|
| Grade 144 | Medium-carbon or alloy steel, quenched & tempered; B, Cr, Mo, V additions permitted to meet hardenability; P 0.030 max, S 0.030 max |
Higher-strength analogue to ASTM F3125 Grade A490 / A490 assemblies; related to F2280 (twist-off A490). Metric equivalent conceptually EN 14399-10 (HRC) class 10.9.
For the official ASTM International standards catalogue, see the ASTM International standards listing. This external reference is provided for standards identification; the purchaser should verify the current edition applicable to the order.
We supply ASTM F3148 fasteners — bolts, screws, studs, nuts and washers as applicable — for energy, petrochemical, marine, structural and general engineering service, in a full range of sizes and finishes.
For technical documentation and quotations, buyers can also review the Ananka Fasteners manufacturing and supply range or contact the team through the fastener enquiry and technical support page.
Ananka Fasteners supplies every lot with full material traceability and third-party testing on request.
Standard specification for high-strength structural bolt assemblies of steel and alloy steel, quenched and tempered (heat treated), 144 ksi minimum tensile strength, in inch dimensions. Covers the complete assembly of a heavy-hex structural bolt with a spline (twist-off) end furnished with a matched heavy-hex nut and washer, tested and marked as a single lot for pretensioned/slip-critical connections. Sizes 1/2 to 1-1/2 in.
Ananka Fasteners supplies Grade 144 to ASTM F3148. See the Grades / Classes Covered table above for full details of each grade.
Minimum tensile strength, yield strength, elongation and hardness requirements vary by grade — see the Mechanical Properties table above for the complete breakdown.
We supply ASTM F3148 fasteners — bolts, screws, studs, nuts and washers as applicable — for energy, petrochemical, marine, structural and general engineering service, in a full range of sizes and finishes.
Yes. For a quotation, provide the required fastener type, grade, nominal size, dimensional standard, quantity and any inspection or certificate requirements.
Need a fastener released to ASTM F3148 for an industrial project? Send the required fastener type, grade, size, quantity and certification requirements to Ananka Fasteners. Our team can review the requirement and provide technical and commercial information for standard or custom configurations.
Recommended RFQ details: ASTM F3148 requirement, material grade, fastener type, nominal size, dimensional standard, quantity, inspection requirements and EN 10204 certificate requirements where applicable.
Data compiled per ASTM F3148 and industry references; provided for reference only — confirm against the current edition of the standard and certified mill test reports before design use.
