| Size Dim. (mm) | Min. ID Min. Dia. (mm) |
|---|---|
| NPU 50 | 1600 |
| NPU 65 | 2000 |
| NPU 80 | 3000 |
| NPU 100 | 5000 |
| NPU 120 | 6000 |
| NPU 140 | 6500 |
| NPU 160 | 7000 |
| NPU 180 | 8000 |
| NPU 200 | 9000 |
| NPU 220 | 10000 |
| NPU 240 | 11000 |
| NPU 260 | 13000 |
| NPU 280 | 14500 |
| NPU 300 | 16000 |
| NPU 320 | 18000 |
| NPU 350 | 20000 |
| NPU 380 | 22000 |
| NPU 400 | 24000 |