At Ananka Fasteners Pvt Ltd, we manufacture and supply fasteners certified to ASTM A638/A638M. Standard specification for precipitation-hardening iron-base superalloy bars, forgings and forging stock for high-temperature service. Principal grade 660 (A286) is used for high-temperature/high-strength bolting and pressure parts.
Standard specification for precipitation-hardening iron-base superalloy bars, forgings and forging stock for high-temperature service. Principal grade 660 (A286) is used for high-temperature/high-strength bolting and pressure parts.
| Grade / Class | UNS / Designation | Type / Notes |
|---|---|---|
| Grade 660 Type 1 | S66286 | A286, solution ~1650 F + age |
| Grade 660 Type 2 | S66286 | A286, solution ~1800 F + age (stress-rupture) |
| Grade 660 Type 3 | S66286 | A286 variant |
| Grade 660 Type 4 | S66286 | A286 variant |
| Grade 662 | S66220 | Fe-Ni-Cr PH superalloy |
Minimum mechanical requirements per ASTM A638/A638M.
| Grade / Class / Condition | Tensile Strength, min | Yield Strength, min | Elongation, min % | Hardness |
|---|---|---|---|---|
| 660 Type 1 | 130 ksi (895 MPa) | 95 ksi (655 MPa) | 15 | 248-341 HBW / 29-32 HRC |
| 660 Type 2 | 130 ksi (895 MPa) | 85 ksi (585 MPa) | 15 | 24-30 HRC |
| 660 (typical, RA) | – | – | RA 18% min | – |
| Grade | Key Composition, % |
|---|---|
| Grade 660 (A286) | Ni 24.0-27.0, Cr 13.5-16.0, Ti 1.90-2.35, Mo 1.00-1.50, V 0.10-0.50, Al 0.35 max, Fe balance |
ASME SA-638; grade 660 (UNS S66286) is A286 – the bar/forging analog of A453 Gr 660 bolting; comparable to AMS 5731/5737 and W.Nr 1.4980.
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 A638/A638M 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 precipitation-hardening iron-base superalloy bars, forgings and forging stock for high-temperature service. Principal grade 660 (A286) is used for high-temperature/high-strength bolting and pressure parts.
Ananka Fasteners supplies Grade 660 Type 1, Grade 660 Type 2, Grade 660 Type 3, Grade 660 Type 4, Grade 662 to ASTM A638/A638M. 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 A638/A638M 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 A638/A638M 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 A638/A638M requirement, material grade, fastener type, nominal size, dimensional standard, quantity, inspection requirements and EN 10204 certificate requirements where applicable.
Data compiled per ASTM A638/A638M and industry references; provided for reference only — confirm against the current edition of the standard and certified mill test reports before design use.
