
| Overall length | Thread length | Thread + Neck length | Shank length | Shank dia. | Size of square | Length of square | |||||||
| L | ℓ | ℓn | ℓs | Ds | K | ℓk | |||||||
| Size | Class | Code | Chamfer | L (mm) | ℓ (mm) | ℓn (mm) | ℓs (mm) | Ds (mm) | K (mm) | ℓk (mm) | Lobe | TYPE | |
| M16 × 1.5 | ISO2X | RM016OBOCTB | 2P | 100 | 18 | - | 51 | 12 | 9 | 12 | 8 | 3 | |
| M18 × 1.5 | ISO2X | RM018OBOCTP | 4P | 110 | 20 | - | 56 | 14 | 11 | 14 | 8 | 3 | |
| M18 × 1.5 | ISO2X | RM018OBOCTB | 2P | 110 | 20 | - | 56 | 14 | 11 | 14 | 8 | 3 | |
| M20 × 1.5 | ISO2X | RM020OBOCTP | 4P | 125 | 20 | - | 64 | 16 | 12 | 15 | 8 | 3 | |
| M20 × 1.5 | ISO2X | RM020OBOCTB | 2P | 125 | 20 | - | 64 | 16 | 12 | 15 | 8 | 3 |
Number of oil grooves: M6 = 5, M8 = 6, M10 and larger = 8 For M6 and smaller, external centers of 2 thread chamfer taps are removed.