At Ananka Fasteners Pvt Ltd, we manufacture and supply fasteners certified to ISO 898-1. ISO 898-1 specifies the mechanical and physical properties of bolts, screws, and studs made of carbon steel and alloy steel, tested at ambient temperature, for thread diameters M1.6 to M39 (coarse and fine pitch). Property classes are given as two numbers (e.g., 8.8) where the first indicates 1/100 of nominal tensile strength in MPa and the second is 10x the yield-to-tensile ratio.
ISO 898-1 specifies the mechanical and physical properties of bolts, screws, and studs made of carbon steel and alloy steel, tested at ambient temperature, for thread diameters M1.6 to M39 (coarse and fine pitch). Property classes are given as two numbers (e.g., 8.8) where the first indicates 1/100 of nominal tensile strength in MPa and the second is 10x the yield-to-tensile ratio.
| Grade / Class | UNS / Designation | Type / Notes |
|---|---|---|
| Class 4.6 | – | Low or medium carbon steel |
| Class 4.8 | – | Low or medium carbon steel, optionally quenched & tempered |
| Class 5.8 | – | Low or medium carbon steel, cold-worked |
| Class 8.8 | – | Medium carbon or carbon boron steel, quenched & tempered |
| Class 10.9 | – | Medium carbon alloy/boron steel, quenched & tempered |
| Class 12.9 | – | Alloy steel, quenched & tempered |
Minimum mechanical requirements per ISO 898-1.
| Grade / Class / Condition | Tensile Strength, min | Yield Strength, min | Elongation, min % | Hardness |
|---|---|---|---|---|
| Class 4.6 | 400 MPa (58 ksi) min | 240 MPa (35 ksi) min | 22 | 120-220 HV |
| Class 5.8 | 520 MPa (75 ksi) min | 420 MPa (61 ksi) min | 10 | 155-220 HV |
| Class 8.8 (M16 and under) | 800 MPa (116 ksi) min | 640 MPa (93 ksi) min | 12 | 250-320 HV |
| Class 8.8 (over M16) | 830 MPa (120 ksi) min | 660 MPa (96 ksi) min | 12 | 255-335 HV |
| Class 10.9 | 1040 MPa (151 ksi) min | 940 MPa (136 ksi) min | 9 | 320-380 HV |
| Class 12.9 | 1220 MPa (177 ksi) min | 1100 MPa (160 ksi) min | 8 | 385-435 HV |
| Grade | Key Composition, % |
|---|---|
| Class 8.8 | Medium carbon or carbon boron steel, C 0.15-0.40, P 0.025 max, S 0.025 max, Q&T |
| Class 10.9 | Alloy or medium-carbon boron steel with Cr/Mo/B, Q&T; P 0.025 max, S 0.025 max |
| Class 12.9 | Alloy steel with Cr/Mo/V, Q&T; P 0.025 max, S 0.025 max |
Companion nut standard is ISO 898-2 and washers ISO 887; stainless equivalent is ISO 3506-1. Adopted as EN ISO 898-1 and mirrored by IS 1367 (Part 3). Class 8.8/10.9 broadly parallel SAE J429 grades 5/8 and ASTM A325/A490.
For the official ISO standards catalogue, see the ISO standards listing. This external reference is provided for standards identification; the purchaser should verify the current edition applicable to the order.
We supply ISO 898-1 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.
ISO 898-1 specifies the mechanical and physical properties of bolts, screws, and studs made of carbon steel and alloy steel, tested at ambient temperature, for thread diameters M1.6 to M39 (coarse and fine pitch). Property classes are given as two numbers (e.g., 8.8) where the first indicates 1/100 of nominal tensile strength in MPa and the second is 10x the yield-to-tensile ratio.
Ananka Fasteners supplies Class 4.6, Class 4.8, Class 5.8, Class 8.8, Class 10.9, Class 12.9 to ISO 898-1. 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 ISO 898-1 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 ISO 898-1 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: ISO 898-1 requirement, material grade, fastener type, nominal size, dimensional standard, quantity, inspection requirements and EN 10204 certificate requirements where applicable.
Data compiled per ISO 898-1 and industry references; provided for reference only — confirm against the current edition of the standard and certified mill test reports before design use.
