Basic Thread Dimensions
*Â The below values are nomoinal (without tolerances) and are valid for both external and internal threads.
| Thread Family |
BSPP (G) |
| Relevant Standards |
ISO 228-1, ISO 228-2 |
Tolerances for all Classes
BSPP G 2 (Internal Thread)
| Property |
Minimum |
Maximum |
| Minor Diameter (D1) |
56.657 mm (2.2306 ") |
57.297 mm (2.2558 ") |
| Pitch Diameter (D2) |
58.135 mm (2.2888 ") |
58.315 mm (2.2959 ") |
BSPP G 2-A (External Higher precision)
| Property |
Minimum |
Maximum |
| Major Diameter (d) |
59.254 mm (2.3328 ") |
59.614 mm (2.347 ") |
| Pitch Diameter (d2) |
57.955 mm (2.2817 ") |
58.135 mm (2.2888 ") |
BSPP G 2-A (External Low precision
| Property |
Minimum |
Maximum |
| Major Diameter (d) |
59.254 mm (2.3328 ") |
59.614 mm (2.347 ") |
| Pitch Diameter (d2) |
57.775 mm (2.2746 ") |
58.135 mm (2.2888 ") |
* For More Threadibg Information go to the BSP Thread Calculator
