Eisen Thread Plug Gauge SPW series for metric threads made of tungsten carbide (half-type and single-type) by MSP Metrology (M) Sdn Bhd from Eisen Japan.


| Type of thread | Pitch | Type of gauge | Class | |
| M1.4 | 0.3 | coarse | GPIP (for JIS inspection) GPWP (for JIS work) |
Ⅱ (JISClass |
| M1.6 | 0.35 | coarse | ||
| M1.7 | 0.35 | coarse | ||
| M1.8 | 0.35 | coarse | ||
| M2 | 0.4 | coarse | ||
| M2.3 | 0.4 | coarse | ||
| M2.5 | 0.45 | coarse | ||
| M2.6 | 0.45 | coarse | ||
| M3 | 0.5 | coarse | ||
| M4 | 0.7 | coarse | ||
| M5 | 0.8 | coarse | ||
| M6 | 1.0 | coarse | ||
| M8 | 1.25 | coarse | ||
| M8 | 1.0 | fine | GPNP (ISO) | 6H (ISOClass) ※M1.4[5H] |
| M10 | 1.5 | coarse | ||
| M10 | 1.25 | fine | ||
| M10 | 1.0 | fine | ||
| M12 | 1.75 | coarse | ||
| M12 | 1.5 | fine | ||
| M12 | 1.25 | fine | ||