At Ananka Fasteners Pvt Ltd, we manufacture and supply fasteners certified to ASTM A194. ASTM A194/A194M covers carbon, alloy and stainless steel nuts for bolts for high-pressure or high-temperature service, or both. Nuts are qualified by hardness and proof load rather than by tension test bars. Grades include carbon (2, 2H, 2HM), alloy (4, 7, 7M) and austenitic stainless (8, 8M). ASME SA-194 is the identical BPVC Section II adoption.
ASTM A194/A194M covers carbon, alloy and stainless steel nuts for bolts for high-pressure or high-temperature service, or both. Nuts are qualified by hardness and proof load rather than by tension test bars. Grades include carbon (2, 2H, 2HM), alloy (4, 7, 7M) and austenitic stainless (8, 8M). ASME SA-194 is the identical BPVC Section II adoption.
| Grade / Class | UNS / Designation | Type / Notes |
|---|---|---|
| 2 | carbon steel | Medium-carbon steel heavy hex nuts |
| 2H | carbon steel | Q&T carbon steel, most common; pairs with B7 |
| 2HM | carbon steel | Q&T, lower hardness for NACE/sour service |
| 4 | C-Mo steel | Q&T carbon-molybdenum (withdrawn 2017) |
| 7 | G41400 | Q&T alloy steel (AISI 4140) |
| 7M | G41400 | Q&T alloy, hardness-controlled for sour service |
| 8 (304) | S30400 | Austenitic stainless heavy hex nuts |
| 8M (316) | S31600 | Austenitic stainless heavy hex nuts |
Minimum mechanical requirements per ASTM A194.
| Grade / Class / Condition | Tensile Strength, min | Yield Strength, min | Elongation, min % | Hardness |
|---|---|---|---|---|
| Grade 2 | proof-load governed | n/a | n/a | 159-352 HBW |
| Grade 2H | proof-load governed | n/a | n/a | 24-38 HRC (248-352 HBW) |
| Grade 2HM | proof-load governed | n/a | n/a | 159-237 HBW (≤22 HRC) |
| Grade 4 | proof-load governed | n/a | n/a | 24 HRC min |
| Grade 7 | proof-load governed | n/a | n/a | 24-38 HRC |
| Grade 7M | proof-load governed | n/a | n/a | 159-237 HBW |
| Grade 8 (304) | proof-load governed | n/a | n/a | 126-300 HBW |
| Grade 8M (316) | proof-load governed | n/a | n/a | 126-300 HBW |
| Grade | Key Composition, % |
|---|---|
| 2H | Carbon steel, C 0.40-0.50; qualified by hardness/proof load |
| 7 | C 0.37-0.49, Cr 0.75-1.20, Mo 0.15-0.25 (AISI 4140) |
| 8 (304) | C 0.08 max, Cr 18-20, Ni 8-11 |
| 8M (316) | C 0.08 max, Cr 16-18, Ni 10-14, Mo 2-3 |
Companion nut to ASTM A193 / A320 bolting: 2H with B7, 7 with B7M, 8/8M with B8/B8M. ASME SA194 is the identical BPVC adoption. Suffix M grades (2HM, 7M) meet NACE MR0175/MR0103 hardness limits for sour service.
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 A194 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 A194/A194M covers carbon, alloy and stainless steel nuts for bolts for high-pressure or high-temperature service, or both. Nuts are qualified by hardness and proof load rather than by tension test bars. Grades include carbon (2, 2H, 2HM), alloy (4, 7, 7M) and austenitic stainless (8, 8M). ASME SA-194 is the identical BPVC Section II adoption.
Ananka Fasteners supplies 2, 2H, 2HM, 4, 7, 7M, 8 (304), 8M (316) to ASTM A194. 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 A194 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 A194 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 A194 requirement, material grade, fastener type, nominal size, dimensional standard, quantity, inspection requirements and EN 10204 certificate requirements where applicable.
Data compiled per ASTM A194 and industry references; provided for reference only — confirm against the current edition of the standard and certified mill test reports before design use.
