At Ananka Fasteners Pvt Ltd, we manufacture and supply fasteners certified to ASME SA320. ASME SA-320 – Standard Specification for Alloy-Steel and Stainless Steel Bolting for Low-Temperature Service. ASME B&PV Code adoption of ASTM A320, technically identical; covers bolting with guaranteed Charpy V-notch toughness at low temperature for cryogenic/refrigeration and cold-service flanged joints.
ASME SA-320 – Standard Specification for Alloy-Steel and Stainless Steel Bolting for Low-Temperature Service. ASME B&PV Code adoption of ASTM A320, technically identical; covers bolting with guaranteed Charpy V-notch toughness at low temperature for cryogenic/refrigeration and cold-service flanged joints.
| Grade / Class | UNS / Designation | Type / Notes |
|---|---|---|
| L7 | SA-320 L7 (UNS G41400) | Cr-Mo (4140-type) Q&T, impact tested at -101 C |
| L7M | SA-320 L7M | Lower-hardness L7 for sour/H2S service |
| L43 | SA-320 L43 (4340-type) | Ni-Cr-Mo Q&T for larger diameters to 4 in |
| B8 Class 2 | SA-320 B8 (304 / S30400) | Strain-hardened austenitic stainless |
| B8M Class 2 | SA-320 B8M (316 / S31600) | Strain-hardened Mo austenitic stainless |
Minimum mechanical requirements per ASME SA320.
| Grade / Class / Condition | Tensile Strength, min | Yield Strength, min | Elongation, min % | Hardness |
|---|---|---|---|---|
| L7 (<=2.5 in) | 125 (860) min | 105 (725) min | 16 | 321 HB / 35 HRC max |
| L7M (<=2.5 in) | 100 (690) min | 80 (550) min | 18 | 235 HB / 99 HRB max |
| L43 (<=4 in) | 125 (860) min | 105 (725) min | 16 | 321 HB / 35 HRC max |
| B8 Cl2 (<=0.75 in) | 125 (860) min | 100 (690) min | 12 | 321 HB max |
| B8M Cl2 (<=0.75 in) | 110 (760) min | 95 (655) min | 15 | 321 HB max |
| Grade | Key Composition, % |
|---|---|
| L7 | AISI 4140: C 0.38-0.48, Cr 0.80-1.10, Mo 0.15-0.25 |
| L43 | AISI 4340: Ni 1.65-2.00, Cr 0.70-0.90, Mo 0.20-0.30 |
| B8 | AISI 304: Cr 18-20, Ni 8-11 |
| B8M | AISI 316: Cr 16-18, Ni 10-14, Mo 2-3 |
Identical to ASTM A320. L7/L43 mirror A193 B7/B7M chemistry but add mandatory low-temperature Charpy impact testing; B8/B8M mirror A193 B8/B8M but strain-hardened Class 2 with impact requirements.
For the official ASME standards catalogue, see the ASME standards listing. This external reference is provided for standards identification; the purchaser should verify the current edition applicable to the order.
We supply ASME SA320 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.
ASME SA-320 – Standard Specification for Alloy-Steel and Stainless Steel Bolting for Low-Temperature Service. ASME B&PV Code adoption of ASTM A320, technically identical; covers bolting with guaranteed Charpy V-notch toughness at low temperature for cryogenic/refrigeration and cold-service flanged joints.
Ananka Fasteners supplies L7, L7M, L43, B8 Class 2, B8M Class 2 to ASME SA320. 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 ASME SA320 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 ASME SA320 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: ASME SA320 requirement, material grade, fastener type, nominal size, dimensional standard, quantity, inspection requirements and EN 10204 certificate requirements where applicable.
Data compiled per ASME SA320 and industry references; provided for reference only — confirm against the current edition of the standard and certified mill test reports before design use.
