At Ananka Fasteners Pvt Ltd, we manufacture and supply fasteners certified to ASME SA194. ASME SA-194/SA-194M is the ASME Boiler & Pressure Vessel Code (Section II, Part A) adoption of ASTM A194/A194M. It covers carbon, alloy and stainless steel nuts intended for use in high-pressure or high-temperature service, or both. Content is essentially identical to ASTM A194; SA194 is the code-stamped version for ASME BPVC construction and is the standard companion nut to SA193 bolting.
ASME SA-194/SA-194M is the ASME Boiler & Pressure Vessel Code (Section II, Part A) adoption of ASTM A194/A194M. It covers carbon, alloy and stainless steel nuts intended for use in high-pressure or high-temperature service, or both. Content is essentially identical to ASTM A194; SA194 is the code-stamped version for ASME BPVC construction and is the standard companion nut to SA193 bolting.
| Grade / Class | UNS / Designation | Type / Notes |
|---|---|---|
| 2 | carbon steel | Medium-carbon steel heavy hex nuts |
| 2H | carbon steel | Quenched & tempered carbon steel, most common |
| 2HM | carbon steel | Q&T, lower hardness for sour/NACE 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| 4 | C-Mo steel | Q&T carbon-molybdenum (withdrawn 2017) |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 ASME SA194.
| Grade / Class / Condition | Tensile Strength, min | Yield Strength, min | Elongation, min % | Hardness |
|---|---|---|---|---|
| Grade 2 | n/a (proof load) | n/a | n/a | 159-352 HBW |
| Grade 2H | n/a (proof load) | n/a | n/a | 24-38 HRC (Brinell 248-352) |
| Grade 2HM | n/a (proof load) | n/a | n/a | 159-237 HBW (max 22 HRC) |
| Grade 4 | n/a (proof load) | n/a | n/a | 24 HRC min |
| Grade 7 | n/a (proof load) | n/a | n/a | 24-38 HRC |
| Grade 7M | n/a (proof load) | n/a | n/a | 159-237 HBW |
| Grade 8 (304) | n/a (proof load) | n/a | n/a | 126-300 HBW (Class 1) |
| Grade 8M (316) | n/a (proof load) | n/a | n/a | 126-300 HBW (Class 1) |
| Grade | Key Composition, % |
|---|---|
| 2 / 2H | C 0.40-0.50 (2H), carbon steel; proof-load & hardness governed |
| 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 |
Equivalent to ASTM A194/A194M (identical technical content). Standard companion nut for ASME SA193/ASTM A193 studs and bolts: 2H nuts with B7, grade 7 with B7M, grade 8/8M with B8/B8M. Suffix numbers denote material; A194 nuts are qualified by hardness and proof load rather than tensile bars.
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 SA194 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-194/SA-194M is the ASME Boiler & Pressure Vessel Code (Section II, Part A) adoption of ASTM A194/A194M. It covers carbon, alloy and stainless steel nuts intended for use in high-pressure or high-temperature service, or both. Content is essentially identical to ASTM A194; SA194 is the code-stamped version for ASME BPVC construction and is the standard companion nut to SA193 bolting.
Ananka Fasteners supplies 2, 2H, 2HM, 4, 7, 7M, 8 (304), 8M (316) to ASME SA194. 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 SA194 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 SA194 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 SA194 requirement, material grade, fastener type, nominal size, dimensional standard, quantity, inspection requirements and EN 10204 certificate requirements where applicable.
Data compiled per ASME SA194 and industry references; provided for reference only — confirm against the current edition of the standard and certified mill test reports before design use.
