Allen Guía Espaciador Calidad 12.9 – Métrico
| Medida nominal | Largo espaciador S (mm) |
| M6 | 9,25 – 9,75 |
| M8 | 10,25 – 10,75 |
| M10 | 12,75 – 13,25 |
| M12 | 15,60 – 16,40 |
| M16 | 17,60 – 18,40 |
| M20 | 21,60 – 22,40 |
| M25 | 26,60 – 27,40 |
Allen Guía Espaciador Calidad 12.9 – Pulgada
| Medida nominal | Largo espaciador S (inch) |
| 1/4″ | 0.365 – 0.373 |
| 5/16″ | 0.418 – 0.438 |
| 3/8″ | 0.480 – 0.500 |
| 7/16″ | 0.595 – 0.625 |
| 1/2″ | 0.720 – 0.750 |
| 5/8″ | 0.945 – 0.980 |
| 3/4″ | 1.095 – 1.125 |
| 1″ | 1.470 – 1.500 |
