At Ananka Fasteners Pvt Ltd, we manufacture and supply fasteners certified to ASTM F738M. Standard specification for stainless steel metric bolts, screws and studs (M1.6 through M36) for general use. Classifies fasteners by austenitic, ferritic, martensitic and precipitation-hardening steel groups and property classes designating strength (e.g., A2-70, A4-80). Note: input scope ‘Stud Bolts, Screws’ is correct but also includes bolts.
Standard specification for stainless steel metric bolts, screws and studs (M1.6 through M36) for general use. Classifies fasteners by austenitic, ferritic, martensitic and precipitation-hardening steel groups and property classes designating strength (e.g., A2-70, A4-80). Note: input scope ‘Stud Bolts, Screws’ is correct but also includes bolts.
| Grade / Class | UNS / Designation | Type / Notes |
|---|---|---|
| A1 | Free-machining austenitic (303/384) | Class 50/70/80 |
| A2 | Austenitic 304/321/347 | Class 50/70/80 (A2-70 most common) |
| A4 | Austenitic 316 (Mo-bearing) | Class 50/70/80 |
| F1 | Ferritic 430 | Class 45/60 |
| C1 | Martensitic 410 | Class 70/110 |
| C3 | Martensitic 431 | Class 80/120 |
| C4 | Martensitic free-machining 416 | Class 70/110 |
| P1 | Precipitation-hardening 630 (17-4PH) | Class 90 |
Minimum mechanical requirements per ASTM F738M.
| Grade / Class / Condition | Tensile Strength, min | Yield Strength, min | Elongation, min % | Hardness |
|---|---|---|---|---|
| A2-70 / A4-70 | 700 MPa (102 ksi) | 450 MPa (65 ksi) [A2]; 300 MPa (44 ksi) [A4] | 0.4D / 0.2D | Austenitic, cold worked |
| A2-80 / A4-80 | 800 MPa (116 ksi) | 600 MPa (87 ksi) | 0.3D | Austenitic, cold worked |
| A2-50 / A4-50 | 500 MPa (73 ksi) | 210 MPa (30 ksi) | 0.6D | Austenitic, annealed |
| F1-60 | 600 MPa (87 ksi) | 410 MPa (59 ksi) | 0.2D | Ferritic 430 |
| C3-80 | 800 MPa (116 ksi) | 640 MPa (93 ksi) | 0.2D | Martensitic 431 |
| C3-120 | 1200 MPa (174 ksi) | 950 MPa (138 ksi) | 0.1D | Martensitic, hardened |
| C1-110 / C4-110 | 1100 MPa (160 ksi) | 820 MPa (119 ksi) | 0.2D | Martensitic, hardened |
| P1-90 | 900 MPa (131 ksi) | 700 MPa (102 ksi) | 0.2D | 17-4PH (UNS S17400) |
| 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 |
| P1 (630/17-4PH) | Cr 15-17.5, Ni 3-5, Cu 3-5, Nb |
Broadly parallels ISO 3506-1 property classes for stainless bolts/screws/studs (A1/A2/A4-50/70/80, C1/C3/C4, F1). UNS grades: 304=S30400, 316=S31600.
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 F738M 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 bolts, screws and studs (M1.6 through M36) for general use. Classifies fasteners by austenitic, ferritic, martensitic and precipitation-hardening steel groups and property classes designating strength (e.g., A2-70, A4-80). Note: input scope ‘Stud Bolts, Screws’ is correct but also includes bolts.
Ananka Fasteners supplies A1, A2, A4, F1, C1, C3, C4, P1 to ASTM F738M. 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 F738M 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 F738M 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 F738M requirement, material grade, fastener type, nominal size, dimensional standard, quantity, inspection requirements and EN 10204 certificate requirements where applicable.
Data compiled per ASTM F738M and industry references; provided for reference only — confirm against the current edition of the standard and certified mill test reports before design use.
