Metric MJ Threads Chart
| BASIC DIMENSIONS AND PITCH | |||
|---|---|---|---|
| MJ designation | Basic major diameter (mm) | Pitch (mm) | Minimum external root radius |
| MJ 2 × 0.4 | 2 | 0.4 | 0.15011P |
| MJ 3 × 0.5 | 3 | 0.5 | 0.15011P |
| MJ 4 × 0.7 | 4 | 0.7 | 0.15011P |
| MJ 5 × 0.8 | 5 | 0.8 | 0.15011P |
| MJ 6 × 1 | 6 | 1 | 0.15011P |
| MJ 8 × 1.25 | 8 | 1.25 | 0.15011P |
| MJ 10 × 1.5 | 10 | 1.5 | 0.15011P |
| MJ 12 × 1.75 | 12 | 1.75 | 0.15011P |
| MJ 16 × 2 | 16 | 2 | 0.15011P |
| MJ 20 × 2.5 | 20 | 2.5 | 0.15011P |
The MJ root radius is a controlled profile feature, and the minor diameters differ from the general M profile. These are common size/pitch callouts; ASME B1.21M covers the standard series from 1.6 to 200 mm and its limits.