ASTM A194 — Nuts for pressure and temperature service
Nuts associated with bolting enquiries for high pressure and/or temperature service. Pairing depends on grade and service requirements.
- Reference
- ASTM A194/A194M — 26
- Configuration
- To specification and drawing
- Dimensions
- Specify units and tolerances
- Supply
- Confirm feasibility and documents
Technical drawing and dimensions to specify
Family selection guide. The drawing only identifies dimensions to specify; it does not identify a certified item, an available size range or a complete assembly. Final geometry and dimensions must match the approved drawing.
Dimensional data for the request
| Symbol | Required information | Units |
|---|---|---|
| d | Nominal thread and pitch | mm or inches, specify |
| s | Width across flats | mm or inches, specify |
| m | Nut height | mm or inches, specify |
Attach the dimensional standard or drawing, tolerances, quantity and configuration. Mechanical properties and grades appear below; they are not geometric dimensions.
Materials, grades and technical requirements
Which A194 nut?
| Grade | Material family | Characteristic |
|---|---|---|
| 2H | Quenched and tempered carbon steel | Nut for pressure / temperature service |
| 2HM | Quenched and tempered carbon steel | Specific hardness requirements |
| 7 / 7M | Quenched and tempered alloy steel | Separate grades; specify required tests |
| 8 | Type 304 stainless steel | Specify condition and marking |
| 8M | Type 316 stainless steel | Specify condition and marking |
Matching bolts and studs
Examples to check against the specification: A193 B7 with 2H; B8 with 8; B8M with 8M. For Class 2, specify any supplementary nut requirements. Establish the temperature rating for the entire joint, not from the nut designation alone.
Specify the nut alongside the bolting
State the nut grade, material, thread and finish. Any supplementary tests must be included in the enquiry and supply documentation.
Technical documentation
Dueemme technical sheet
Download technical PDF ↓Assembly and traceability
Lot, markings, component list and conformity documents relevant to the supply.
EN 10204 3.1 · DoP · CoC
State the required documents. Applicability and availability are confirmed during enquiry review.
Testing and coatings
Dimensional reports, mechanical tests, coating reports and ROCAP where applicable to the specification.
Application sectors
Industrial and EPC projects, according to the specified application.
Dueemme industries →Have a structural or ASTM specification?
Build your enquiry. In the next step, add your contact details and attach the specification, bill of materials or drawing.