At Ananka Fasteners Pvt Ltd, we manufacture and supply fasteners certified to IS 3757. IS 3757 is the Indian Standard for high-strength friction-grip (HSFG) structural bolts, covering large hexagon-head bolts with short thread lengths in sizes M16 to M36, in property classes 8.8S and 10.9S. Bolts are intended for friction-type and bearing-type structural steel joints and are matched with IS 6623 nuts and IS 6649 washers. Mechanical requirements are drawn from IS 1367 (Part 3), which mirrors ISO 898-1.
IS 3757 is the Indian Standard for high-strength friction-grip (HSFG) structural bolts, covering large hexagon-head bolts with short thread lengths in sizes M16 to M36, in property classes 8.8S and 10.9S. Bolts are intended for friction-type and bearing-type structural steel joints and are matched with IS 6623 nuts and IS 6649 washers. Mechanical requirements are drawn from IS 1367 (Part 3), which mirrors ISO 898-1.
| Grade / Class | UNS / Designation | Type / Notes |
|---|---|---|
| Class 8.8S | – | High-strength structural bolt, quenched & tempered carbon/boron steel |
| Class 10.9S | – | Higher-strength structural bolt, quenched & tempered alloy steel |
Minimum mechanical requirements per IS 3757.
| Grade / Class / Condition | Tensile Strength, min | Yield Strength, min | Elongation, min % | Hardness |
|---|---|---|---|---|
| Class 8.8S | 830 MPa (120 ksi) min | 660 MPa (96 ksi) min | 12 | 255-336 HV |
| Class 10.9S | 1040 MPa (151 ksi) min | 940 MPa (136 ksi) min | 9 | 312-434 HV |
| Grade | Key Composition, % |
|---|---|
| Class 8.8S | Carbon/boron or carbon steel, quenched & tempered; C 0.15-0.40 typical |
| Class 10.9S | Alloy steel or medium-carbon boron steel, quenched & tempered |
Directly equivalent to ISO 898-1 property classes 8.8 and 10.9 and comparable to ASTM A325/A490 (F3125). Matching Indian nut standard is IS 6623 and washer standard IS 6649; supersedes older HSFG assemblies in Indian structural practice.
For the official Bureau of Indian Standards (BIS) standards catalogue, see the Bureau of Indian Standards (BIS) standards listing. This external reference is provided for standards identification; the purchaser should verify the current edition applicable to the order.
We supply IS 3757 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.
IS 3757 is the Indian Standard for high-strength friction-grip (HSFG) structural bolts, covering large hexagon-head bolts with short thread lengths in sizes M16 to M36, in property classes 8.8S and 10.9S. Bolts are intended for friction-type and bearing-type structural steel joints and are matched with IS 6623 nuts and IS 6649 washers. Mechanical requirements are drawn from IS 1367 (Part 3), which mirrors ISO 898-1.
Ananka Fasteners supplies Class 8.8S, Class 10.9S to IS 3757. 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 IS 3757 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 IS 3757 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: IS 3757 requirement, material grade, fastener type, nominal size, dimensional standard, quantity, inspection requirements and EN 10204 certificate requirements where applicable.
Data compiled per IS 3757 and industry references; provided for reference only — confirm against the current edition of the standard and certified mill test reports before design use.
