| Width | B | 60 | mm |
| Height | T | 50 | mm |
| Diameter | D | 20 | mm |
| length | L | 20 | mm |
| Width across Flat | W | 3 | mm |
| Mounting dimension | JB | 10 | mm |
| Upper tolerance | Tol A5 | +0,15 |
| Size thread fixing screws above | K5 | M4 | |
| Lower tolerance | Tol H2 | -0,15 | |
| Tolerance | ±0,15 |
| Fabricante | Referencia |
|---|---|
| Rodriguez | WBAS 20 |
| Thomson | SB M20 |
| minitec | WB 20 |
| Nadella | WB20 |
| Dr-Tretter | WB55 020 |
| Rodriguez | WBS 20 |
