Related Specifications
Surface Treatments
Certifications
- ISO 9001 - 2015 Certified
- PED 2014/68/EC
- NACE MR0175/ISO 15156-2
- NORSOK M-650
- DFAR
- MERKBLATT AD 2000 W2/W7/W10
Standard stud bolts used in flange assemblies for piping systems and pressure vessels
ASME B16.5 Inch Stud Bolts Dimension Standard define standard lengths, diameters, and threading used in flange connections across piping systems, ensuring leak-proof and secure fastening.

| Nominal Size | Diameter, D | Chamfered Thread Distance, U | |||||
|---|---|---|---|---|---|---|---|
| UNC Threads | UNF Threads | 8UN Threads | |||||
| Min. | Max. | Min. | Max. | Min. | Max. | ||
| 1/4 | 0.2500 | 0.050 | 0.100 | 0.036 | 0.071 | … | … |
| 5/16 | 0.3125 | 0.056 | 0.111 | 0.042 | 0.083 | … | … |
| 3/8 | 0.3750 | 0.063 | 0.125 | 0.042 | 0.083 | … | … |
| 7/16 | 0.4375 | 0.072 | 0.143 | 0.050 | 0.100 | … | … |
| 1/2 | 0.5000 | 0.077 | 0.154 | 0.050 | 0.100 | … | … |
| 9/16 | 0.5625 | 0.084 | 0.167 | 0.056 | 0.111 | … | … |
| 5/8 | 0.6250 | 0.091 | 0.182 | 0.056 | 0.111 | … | … |
| 3/4 | 0.7500 | 0.100 | 0.200 | 0.063 | 0.125 | … | … |
| 7/8 | 0.8750 | 0.111 | 0.222 | 0.072 | 0.143 | … | … |
| 1 | 1.0000 | 0.125 | 0.250 | 0.084 | 0.167 | … | … |
| 1 1/8 | 1.1250 | 0.143 | 0.286 | 0.084 | 0.167 | 0.125 | 0.250 |
| 1 1/4 | 1.2500 | 0.143 | 0.286 | 0.084 | 0.167 | 0.125 | 0.250 |
| 1 3/8 | 1.3750 | 0.167 | 0.333 | 0.084 | 0.167 | 0.125 | 0.250 |
| 1 1/2 | 1.5000 | 0.167 | 0.333 | 0.084 | 0.167 | 0.125 | 0.250 |
| 1 5/8 | 1.6250 | … | … | … | … | 0.125 | 0.250 |
| 1 3/4 | 1.7500 | 0.200 | 0.400 | … | … | 0.125 | 0.250 |
| 1 7/8 | 1.8750 | … | … | … | … | 0.125 | 0.250 |
| 2 | 2.0000 | 0.222 | 0.444 | … | … | 0.125 | 0.250 |
| 2 1/4 | 2.2500 | 0.222 | 0.444 | … | … | 0.125 | 0.250 |
| 2 1/2 | 2.5000 | 0.250 | 0.500 | … | … | 0.125 | 0.250 |
| 2 3/4 | 2.7500 | 0.250 | 0.500 | … | … | 0.125 | 0.250 |
| 3 | 3.0000 | 0.250 | 0.500 | … | … | 0.125 | 0.250 |
| 3 1/4 | 3.2500 | 0.250 | 0.500 | … | … | 0.125 | 0.250 |
| 3 1/2 | 3.5000 | 0.250 | 0.500 | … | … | 0.125 | 0.250 |
| 3 3/4 | 3.7500 | 0.250 | 0.500 | … | … | 0.125 | 0.250 |
| 4 | 4.0000 | 0.250 | 0.500 | … | … | 0.125 | 0.250 |
| Range, LT | Tolerances |
|---|---|
| From ¾ through 2½ | ±0.04 |
| Over 2½ through 4 | ±0.08 |
| Over 4 through 8 | ±0.10 |
| Over 8 through 16 | ±0.12 |
| Over 16 | ±0.18 |