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BSPP Spec Table
BSPP KS Specifications — 9 sizes
ISO 228-1
ISOBSPP
9 sizes| Nominal | TPI | Major Dia (mm) | Minor Dia (mm) | Pitch Dia (mm) | Standard |
|---|---|---|---|---|---|
| G 1/8 | 28 | 9.728 | 8.566 | 9.147 | ISO 228-1 |
| G 1/4 | 19 | 13.157 | 11.445 | 12.301 | ISO 228-1 |
| G 3/8 | 19 | 16.662 | 14.95 | 15.806 | ISO 228-1 |
| G 1/2 | 14 | 20.955 | 18.631 | 19.793 | ISO 228-1 |
| G 3/4 | 14 | 26.441 | 24.117 | 25.279 | ISO 228-1 |
| G 1 | 11 | 33.249 | 30.291 | 31.77 | ISO 228-1 |
| G 1 1/4 | 11 | 41.91 | 38.952 | 40.431 | ISO 228-1 |
| G 1 1/2 | 11 | 47.803 | 44.845 | 46.324 | ISO 228-1 |
| G 2 | 11 | 59.614 | 56.656 | 58.135 | ISO 228-1 |
This specification follows ISO (International Organization for Standardization) standards. ISO ensures cross-border compatibility, making it ideal for multinational projects, export equipment design, and global parts procurement.
BSPP (British Standard Pipe Parallel), also called "G thread," is the parallel pipe thread per ISO 228-1. Being non-tapered, it cannot self-seal — a flat washer, O-ring, or bonded seal is required. This table lists major diameter, TPI, minor diameter, and pitch diameter from G 1/8 to G 2. Widely used on European, Japanese, and Chinese industrial equipment for hydraulic and pneumatic ports, sensors, and gauge connections.