At Ananka Fasteners Pvt Ltd, we manufacture and supply fasteners certified to ASTM F836M. Standard specification for stainless steel metric nuts (style 1 and style 2 hex, M1.6 through M36) for general use. Nuts are classified by stainless steel group (austenitic A1/A2/A4, ferritic F1, martensitic C1/C3/C4) and property class denoting proof-load stress, to mate with ASTM F738M / ISO 3506 bolts.
Standard specification for stainless steel metric nuts (style 1 and style 2 hex, M1.6 through M36) for general use. Nuts are classified by stainless steel group (austenitic A1/A2/A4, ferritic F1, martensitic C1/C3/C4) and property class denoting proof-load stress, to mate with ASTM F738M / ISO 3506 bolts.
| Grade / Class | UNS / Designation | Type / Notes |
|---|---|---|
| A1 | Free-machining austenitic (303/384) | Nut class 50/70/80 |
| A2 | Austenitic 304 (S30400) | Nut class 70/80 (A2-70 common) |
| A4 | Austenitic 316 (S31600) | Nut class 70/80 |
| F1 | Ferritic 430 | Nut class 45/60 |
| C1 | Martensitic 410 | Nut class 70/110 |
| C4 | Martensitic 416 | Nut class 70/110 |
Minimum mechanical requirements per ASTM F836M.
| Grade / Class / Condition | Tensile Strength, min | Yield Strength, min | Elongation, min % | Hardness |
|---|---|---|---|---|
| A2-70 / A4-70 | Proof stress 700 MPa (102 ksi) | n/a (nut) | n/a | Hardness <=250 HV |
| A2-80 / A4-80 | Proof stress 800 MPa (116 ksi) | n/a (nut) | n/a | Hardness <=320 HV |
| F1-60 | Proof stress 600 MPa (87 ksi) | n/a (nut) | n/a | Ferritic 430 |
| C1-110 | Proof stress 1100 MPa (160 ksi) | n/a (nut) | n/a | Martensitic, hardened |
| Grade | Key Composition, % |
|---|---|
| A2 (304) | C 0.08 max, Cr 17-19, Ni 8-11 |
| A4 (316) | C 0.08 max, Cr 16-18.5, Ni 10-14, Mo 2-3 |
| C1 (410) | C 0.09-0.15, Cr 11.5-13.5 |
Nut counterpart to ASTM F738M bolts; mirrors ISO 3506-2 stainless nut property classes.
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 F836M 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 stainless steel metric nuts (style 1 and style 2 hex, M1.6 through M36) for general use. Nuts are classified by stainless steel group (austenitic A1/A2/A4, ferritic F1, martensitic C1/C3/C4) and property class denoting proof-load stress, to mate with ASTM F738M / ISO 3506 bolts.
Ananka Fasteners supplies A1, A2, A4, F1, C1, C4 to ASTM F836M. 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 F836M 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 F836M 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 F836M requirement, material grade, fastener type, nominal size, dimensional standard, quantity, inspection requirements and EN 10204 certificate requirements where applicable.
Data compiled per ASTM F836M and industry references; provided for reference only — confirm against the current edition of the standard and certified mill test reports before design use.
