At Ananka Fasteners Pvt Ltd, we manufacture and supply fasteners certified to ASTM A1099. ASTM A1099/A1099M covers modified high-strength alloy steel forgings, forged bar, and rolled bar commonly used in oil-and-gas pressure vessels and oilfield equipment (wellhead components, subsea systems, riser couplings, hoisting equipment) per API standards. Grades are quenched-and-tempered low-alloy steels supplied to a range of strength classes. Note: this standard is modified alloy steel, not duplex stainless.
ASTM A1099/A1099M covers modified high-strength alloy steel forgings, forged bar, and rolled bar commonly used in oil-and-gas pressure vessels and oilfield equipment (wellhead components, subsea systems, riser couplings, hoisting equipment) per API standards. Grades are quenched-and-tempered low-alloy steels supplied to a range of strength classes. Note: this standard is modified alloy steel, not duplex stainless.
| Grade / Class | UNS / Designation | Type / Notes |
|---|---|---|
| F22OF | K21590 (2.25Cr-1Mo modified) | Classes 75, 80, 85 |
| F22OFA | – | Class 105 |
| 4130OF | G41300 modified | Classes 60, 75, 80, 95, 110, 125 |
| 8630OF | G86300 modified | Classes 75, 80, 85, 95, 100, 110, 120, 135 |
Minimum mechanical requirements per ASTM A1099.
| Grade / Class / Condition | Tensile Strength, min | Yield Strength, min | Elongation, min % | Hardness |
|---|---|---|---|---|
| F22OF Class 85 | 105 (725) min | 85 (585) min | 18 | 217-237 HBW |
| 4130OF Class 110 | 125 (860) min | 110 (760) min | 16 | 255-311 HBW |
| 4130OF Class 125 | 135 (925) min | 125 (860) min | 15 | 277-321 HBW |
| 8630OF Class 135 | 150 (1025) min | 135 (930) min | 15 | 321-375 HBW |
| Grade | Key Composition, % |
|---|---|
| F22OF | Cr 2.00-2.50, Mo 0.90-1.10, C 0.15 max (modified 2.25Cr-1Mo) |
| 4130OF | Cr 0.80-1.10, Mo 0.15-0.25, C 0.28-0.33, Mn 0.40-0.60 |
| 8630OF | Ni 0.40-0.70, Cr 0.40-0.60, Mo 0.15-0.25, C 0.28-0.33 |
Closely related to ASTM A182 (F22), A320/A193 low-alloy bolting chemistries, and to API 6A / API 20B forging requirements for oilfield equipment. Grade base chemistries follow SAE 4130 and 8630.
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 A1099 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.
ASTM A1099/A1099M covers modified high-strength alloy steel forgings, forged bar, and rolled bar commonly used in oil-and-gas pressure vessels and oilfield equipment (wellhead components, subsea systems, riser couplings, hoisting equipment) per API standards. Grades are quenched-and-tempered low-alloy steels supplied to a range of strength classes. Note: this standard is modified alloy steel, not duplex stainless.
Ananka Fasteners supplies F22OF, F22OFA, 4130OF, 8630OF to ASTM A1099. 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 A1099 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 A1099 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 A1099 requirement, material grade, fastener type, nominal size, dimensional standard, quantity, inspection requirements and EN 10204 certificate requirements where applicable.
Data compiled per ASTM A1099 and industry references; provided for reference only — confirm against the current edition of the standard and certified mill test reports before design use.
