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 5 1/2 (Internal Thread)
Property |
Minimum |
Maximum |
Minor Diameter (D1) |
148.173 mm (5.8336 ") |
148.813 mm (5.8588 ") |
Pitch Diameter (D2) |
149.651 mm (5.8918 ") |
149.868 mm (5.9003 ") |
BSPP G 5 1/2-A (External Higher precision)
Property |
Minimum |
Maximum |
Major Diameter (d) |
150.696 mm (5.9329 ") |
151.13 mm (5.95 ") |
Pitch Diameter (d2) |
149.434 mm (5.8832 ") |
149.651 mm (5.8918 ") |
BSPP G 5 1/2-A (External Low precision
Property |
Minimum |
Maximum |
Major Diameter (d) |
150.696 mm (5.9329 ") |
151.13 mm (5.95 ") |
Pitch Diameter (d2) |
149.217 mm (5.8747 ") |
149.651 mm (5.8918 ") |
* For More Threadibg Information go to the BSP Thread Calculator