Stud bolts and studs, made in-house.
A stud bolt – also called a stud or studbolt – is a rod threaded over its full length or at both ends that clamps a flange joint with two nuts. We make them to ASTM A193 B7, B7M and B16 and ASTM A320 L7, and to DIN 976 and DIN 2510, with the matching nuts such as 2H.
Stud bolts (studbolts) cut, chamfered and marked in our own Dutch production – B7 / 2H, B7M / 2HM, L7 and B8M to DIN, ISO, ASTM and ASME, in every major coating. Configure yours below, or send us your list.
Stud bolt sizes and threads.
Inch stud bolts for ASME B16.5 flanges with UNC / 8UN threads, metric stud bolts to DIN 976-1 – each with its matching nut. B7 / 2H stud bolts from stock: lead time within 1 week. Other sizes and lengths on request.
Inch stud bolts – thread and heavy hex nut (ASME B18.2.2)
| Size | Thread | Heavy hex nut, across flats |
|---|---|---|
| 1/2" | 1/2"-13 UNC | 7/8" |
| 5/8" | 5/8"-11 UNC | 1-1/16" |
| 3/4" | 3/4"-10 UNC | 1-1/4" |
| 7/8" | 7/8"-9 UNC | 1-7/16" |
| 1" | 1"-8 UNC | 1-5/8" |
| 1-1/8" | 1-1/8"-8 UN | 1-13/16" |
| 1-1/4" | 1-1/4"-8 UN | 2" |
| 1-3/8" | 1-3/8"-8 UN | 2-3/16" |
| 1-1/2" | 1-1/2"-8 UN | 2-3/8" |
| 1-5/8" | 1-5/8"-8 UN | 2-9/16" |
| 1-3/4" | 1-3/4"-8 UN | 2-3/4" |
| 1-7/8" | 1-7/8"-8 UN | 2-15/16" |
| 2" | 2"-8 UN | 3-1/8" |
| 2-1/4" | 2-1/4"-8 UN | 3-1/2" |
| 2-1/2" | 2-1/2"-8 UN | 3-7/8" |
Metric stud bolts – thread pitch (DIN 976-1)
| Size | Pitch, coarse (mm) | Fine thread |
|---|---|---|
| M12 | 1.75 | M12 × 1.25 · M12 × 1.5 |
| (M14) | 2 | M14 × 1.5 |
| M16 | 2 | M16 × 1.5 |
| (M18) | 2.5 | M18 × 1.5 |
| M20 | 2.5 | M20 × 1.5 |
| (M22) | 2.5 | M22 × 1.5 |
| M24 | 3 | M24 × 2 |
| (M27) | 3 | M27 × 2 |
| M30 | 3.5 | M30 × 2 |
| (M33) | 3.5 | M33 × 2 |
| M36 | 4 | M36 × 3 |
| (M39) | 4 | M39 × 3 |
| M42 | 4.5 | M42 × 3 |
| (M45) | 4.5 | M45 × 3 |
| M48 | 5 | M48 × 3 |
| (M52) | 5 | M52 × 3 |
| M56 | 5.5 | M56 × 4 |
| (M60) | 5.5 | M60 × 4 |
| M64 | 6 | M64 × 4 |
Sizes in brackets are non-preferred sizes in DIN 976-1.
42CrMo4 (1.7225) stud bolts
For pressure equipment to European standards we supply stud bolts in 42CrMo4 (material number 1.7225), quenched and tempered to EN 10269 – the European counterpart of ASTM A193 B7. Supplied with EN 10204 3.1 certificate, 3.2 on request.
Every major grade, standard and coating.
| Grade | Standard | Service | Matching nut | Select |
|---|---|---|---|---|
| B7 | ASTM A193 | Alloy steel · high-temperature service | ASTM A194 2H | |
| B7M | ASTM A193 | Alloy steel · sour service (NACE MR0175) | ASTM A194 2HM | |
| L7 | ASTM A320 | Low temperature · impact-tested for cold service | ASTM A194 7 | |
| L7M | ASTM A320 | Low temperature · impact-tested for cold service | ASTM A194 7M | |
| B8 | ASTM A193 | Stainless · AISI 304 | ASTM A194 8 | |
| B8M | ASTM A193 | Stainless · AISI 316 | ASTM A194 8M | |
| A2-70 | ISO 3506 | Stainless · A2 | ISO 3506-2 A2-70 | |
| A4-70 | ISO 3506 | Stainless · A4 | ISO 3506-2 A4-70 | |
| A4-80 | ISO 3506 | Stainless · A4 | ISO 3506-2 A4-80 | |
| 8.8 | ISO 898-1 | Carbon steel property class | ISO 898-2 class 8 | |
| 10.9 | ISO 898-1 | Alloy steel property class | ISO 898-2 class 10 | |
| 12.9 | ISO 898-1 | Alloy steel property class | ISO 898-2 class 12 | |
| 42CrMo4 | EN 10269 | Alloy steel for pressure applications | grade on request | |
| 25CrMo4 | EN 10269 | Alloy steel for pressure applications | grade on request | |
| X5CrNiMo17-12-2 | EN 10269 | Stainless · 1.4401 | grade on request |
Dimensions per standard.
Technical datasheets with drawings and dimension tables – free to download.
Quality you can trace.
Every stud bolt carries its grade, heat number and manufacturer's symbol – permanently marked and traceable to its EN 10204 3.1 / 3.2 certificate. Quality you can audit, on every joint, in every country.
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