At Ananka Fasteners Pvt Ltd, we manufacture and supply fasteners certified to ASTM A563. Chemical, mechanical and dimensional requirements for carbon and alloy steel nuts (inch series) used with bolts, studs and other externally threaded fasteners over a wide strength range. Grades O, A, B, C, C3, D, DH and DH3 in hex and heavy hex styles; grade governs proof load and hardness. Nut properties are specified as proof load stress (shown below in the tensile column) rather than tensile/yield.
Chemical, mechanical and dimensional requirements for carbon and alloy steel nuts (inch series) used with bolts, studs and other externally threaded fasteners over a wide strength range. Grades O, A, B, C, C3, D, DH and DH3 in hex and heavy hex styles; grade governs proof load and hardness. Nut properties are specified as proof load stress (shown below in the tensile column) rather than tensile/yield.
| Grade / Class | UNS / Designation | Type / Notes |
|---|---|---|
| Grade A | Carbon steel | Hex/heavy hex; low-carbon general purpose |
| Grade B | Carbon steel | Hex/heavy hex; mates with A307/A449 |
| Grade C | Carbon steel, Q&T | Heavy hex; A325 structural |
| Grade C3 | Weathering steel, Q&T | Heavy hex; weathering structural |
| Grade D | Carbon steel, Q&T | Heavy hex |
| Grade DH | Carbon steel, Q&T | Heavy hex; A325/A490 structural |
| Grade DH3 | Weathering steel, Q&T | Heavy hex; weathering A490 |
Minimum mechanical requirements per ASTM A563.
| Grade / Class / Condition | Tensile Strength, min | Yield Strength, min | Elongation, min % | Hardness |
|---|---|---|---|---|
| Grade A (proof load) | 90 ksi (620) | n/a | n/a | 116-302 HBW |
| Grade B (proof load) | 133 ksi (915) | n/a | n/a | 116-302 HBW |
| Grade C (proof load) | 144 ksi (990) | n/a | n/a | 143-352 HBW |
| Grade C3 (proof load) | 144 ksi (990) | n/a | n/a | 143-352 HBW |
| Grade D (proof load) | 150 ksi (1035) | n/a | n/a | 248-352 HBW |
| Grade DH (proof load) | 175 ksi (1205) | n/a | n/a | 248-352 HBW |
| Grade DH3 (proof load) | 175 ksi (1205) | n/a | n/a | 248-352 HBW |
| Grade | Key Composition, % |
|---|---|
| Grades A/B/D/DH | Carbon steel; C, Mn, P, S per grade; higher grades quenched and tempered |
| Grades C3/DH3 | Weathering steel with Cu, Cr, Ni, Si for atmospheric corrosion resistance |
ASME SA-563 (BPVC Sec. II) is the ASME adoption of ASTM A563 with essentially identical content. Grade selection follows F3125/A325 (Grade C/DH) and A490 (Grade DH/DH3). Metric counterpart is ASTM A563M. Galvanized nuts have reduced proof loads.
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 A563 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.
Chemical, mechanical and dimensional requirements for carbon and alloy steel nuts (inch series) used with bolts, studs and other externally threaded fasteners over a wide strength range. Grades O, A, B, C, C3, D, DH and DH3 in hex and heavy hex styles; grade governs proof load and hardness. Nut properties are specified as proof load stress (shown below in the tensile column) rather than tensile/yield.
Ananka Fasteners supplies Grade A, Grade B, Grade C, Grade C3, Grade D, Grade DH, Grade DH3 to ASTM A563. 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 A563 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 A563 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 A563 requirement, material grade, fastener type, nominal size, dimensional standard, quantity, inspection requirements and EN 10204 certificate requirements where applicable.
Data compiled per ASTM A563 and industry references; provided for reference only — confirm against the current edition of the standard and certified mill test reports before design use.
