At Ananka Fasteners Pvt Ltd, we manufacture and supply fasteners certified to ISO 898-2. International standard specifying the mechanical and physical properties of nuts with coarse and fine pitch thread made of carbon steel and alloy steel, when tested at an ambient temperature range of 10 C to 35 C. Defines property classes and proof-load requirements for style 1 and style 2 nuts.
International standard specifying the mechanical and physical properties of nuts with coarse and fine pitch thread made of carbon steel and alloy steel, when tested at an ambient temperature range of 10 C to 35 C. Defines property classes and proof-load requirements for style 1 and style 2 nuts.
| Grade / Class | UNS / Designation | Type / Notes |
|---|---|---|
| Class 4 | – | Low-strength nut, mates with 3.6/4.6/4.8 bolts |
| Class 5 | – | Mates with 3.6/4.6/4.8/5.6/5.8 bolts |
| Class 6 | – | Mates with 6.8 bolts |
| Class 8 | – | Style 1, mates with 8.8 bolts |
| Class 9 | – | Style 2, mates with 9.8 bolts |
| Class 10 | – | Mates with 10.9 bolts |
| Class 12 | – | Mates with 12.9 bolts |
Minimum mechanical requirements per ISO 898-2.
| Grade / Class / Condition | Tensile Strength, min | Yield Strength, min | Elongation, min % | Hardness |
|---|---|---|---|---|
| Class 4 | – | – | – | Sp 510 MPa (74,000 psi); HV 302 max |
| Class 5 | – | – | – | Sp 580 MPa (84,100 psi); HV 130-302 |
| Class 6 | – | – | – | Sp 670 MPa (97,200 psi); HV 150-302 |
| Class 8 (style 1) | – | – | – | Sp 800 MPa (116,000 psi); HV 200-302 |
| Class 9 (style 2) | – | – | – | Sp 900 MPa (130,500 psi); HV 188-302 |
| Class 10 | – | – | – | Sp 1040 MPa (150,800 psi); HV 272-353 |
| Class 12 | – | – | – | Sp 1150 MPa (166,800 psi); HV 295-353 |
| Grade | Key Composition, % |
|---|---|
| All classes (carbon/alloy steel) | C 0.58 max; P 0.060 max; S 0.150 max (class-dependent). Higher classes may use alloying and be quenched & tempered. |
Part 2 of ISO 898 (bolts are Part 1). Aligns with dimensional standards ISO 4032/4033/4034 (hex nuts) and ISO 8673/8674/8675 (fine pitch). ASTM equivalents for carbon-steel nuts are ASTM A563 / A563M; SAE J995 grades broadly correspond.
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 898-2 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.
International standard specifying the mechanical and physical properties of nuts with coarse and fine pitch thread made of carbon steel and alloy steel, when tested at an ambient temperature range of 10 C to 35 C. Defines property classes and proof-load requirements for style 1 and style 2 nuts.
Ananka Fasteners supplies Class 4, Class 5, Class 6, Class 8, Class 9, Class 10, Class 12 to ISO 898-2. 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 898-2 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 898-2 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 898-2 requirement, material grade, fastener type, nominal size, dimensional standard, quantity, inspection requirements and EN 10204 certificate requirements where applicable.
Data compiled per ISO 898-2 and industry references; provided for reference only — confirm against the current edition of the standard and certified mill test reports before design use.
