ASTM A193 B8 • A194 GR 8
We supply stainless steel hex bolts, hex nuts, stud bolts, threaded rods, washers, screws, anchor bolts and U-bolts in metric and imperial threads, from M3 to M64 and ¼″ to 2½″, for flange bolting and general fabrication.
Bolting is sourced to ASTM A193 B8 / B8M (Class 1 & 2) and A194 Gr 8 / 8M for pressure-flange service, and to ISO 3506 A2-70 / A4-80 for structural and equipment use. Each lot is traceable to its heat number and supplied with test certificates.
Grades marked with a light-blue diamond are duplex / super duplex. Other austenitic, ferritic and nickel-alloy grades on request.
| Size | Pitch (mm) | Across Flats s | Head Height k | Nut Height m |
|---|---|---|---|---|
| M6 | 1.0 | 10 | 4 | 5.2 |
| M8 | 1.25 | 13 | 5.3 | 6.8 |
| M10 | 1.5 | 16 | 6.4 | 8.4 |
| M12 | 1.75 | 18 | 7.5 | 10.8 |
| M14 | 2.0 | 21 | 8.8 | 12.8 |
| M16 | 2.0 | 24 | 10 | 14.8 |
| M20 | 2.5 | 30 | 12.5 | 18 |
| M24 | 3.0 | 36 | 15 | 21.5 |
| M27 | 3.0 | 41 | 17 | 23.8 |
| M30 | 3.5 | 46 | 18.7 | 25.6 |
| M36 | 4.0 | 55 | 22.5 | 31 |
| Flange NPS | Stud Dia | Stud Length (RF) | Qty per Flange |
|---|---|---|---|
| 1/2 | 1/2" | 2 1/4" | 4 |
| 3/4 | 1/2" | 2 1/2" | 4 |
| 1 | 1/2" | 2 1/2" | 4 |
| 1 1/2 | 1/2" | 2 3/4" | 4 |
| 2 | 5/8" | 3 1/4" | 4 |
| 3 | 5/8" | 3 1/2" | 4 |
| 4 | 5/8" | 3 1/2" | 8 |
| 6 | 3/4" | 4" | 8 |
| 8 | 3/4" | 4 1/4" | 8 |
| 10 | 7/8" | 4 3/4" | 12 |
| 12 | 7/8" | 4 3/4" | 12 |
