Home / Products / Fasteners
High-temperature bolts, studs and nuts
Studs are judged on the certificate. A193 B7, B8, B8M or B16, A194 2H nuts, ±0.01 mm, 100% PMI.
Product range
| Stud | Matched nut | Service ceiling | Specified for |
|---|---|---|---|
| A193 B7 studs | A194 2H nuts | 454 °C | General high-temperature and high-pressure service |
| A193 B8 studs | A194 8 nuts | 538 °C | Corrosive service at moderate temperature |
| A193 B8M studs | A194 8M nuts | 538 °C | Chloride-bearing and marine-adjacent service |
| A193 B16 studs | A194 4 / 7 nuts | 593 °C | Higher temperature than B7 |
Bolting is bought against a code
A stud is not specified by material alone; it is specified by the code that names the grade, the test and the marking. That is why the enquiry needs the specification rather than a description, and why the certificate is the deliverable as much as the part.
Why PMI is 100%
A mixed lot of bolting on a pressure boundary is a failure waiting to happen, and sampling cannot find one wrong piece in a box. Every piece is identified.
Where it is used
- Flange and pressure-vessel bolting
- Furnace and kiln assembly
- Sour service, NACE MR0175
- Power generation
- Heat exchanger assembly
Where to read next
| Grades & composition | Which bolting grades and what each is used for. |
| Sizes & tolerances | 1/2 in to 4 in and M12 to M100, with the tolerance held. |
| Supply forms | Studs, bolts, nuts and washers; plain, PTFE or zinc flake. |
| Testing | 100% PMI, hardness, tensile, and UT or MPI on request. |
| Ordering | The six details that produce a quotation. |