If two or more recirculating units are positioned adjacent to each other or one behind another, they must be ordered with the additional designation GP (paired matching).
Types in bold are standard. Size 12 types are available on request.
Manufacturing Tolerances and Group Tolerances
| Type | Manufacturing tolerances (mm) | Group tolerances (µm) within pairs | ||
|---|---|---|---|---|
| A | B | A | B | |
| SK 1, 2 | 0/-0.1 | ±0.005 | 2 | 2 |
| SK 3, 6, 9, 121) | 0/-0.1 | ±0.005 | 3 | 3 |
| SKD 6, 9, 121) | 0/-0.1 | ±0.005 | 3 | 3 |
| SKC 6, 9 | 0/-0.1 | ±0.005 | 3 | 3 |
| SR 2 | 0/-0.1 | ±0.005 | 2 | 2 |
| SR 3, 6, 9, 121) | 0/-0.1 | ±0.005 | 3 | 3 |
Markings
Recirculating units within the same group are marked with a number. The same number indicates components with identical tolerance groups.
NRT Markings
| Type | Manufacturing tolerance A | Sorts (µm) | Markings |
|---|---|---|---|
| NRT | -0.025 | -20 to -25 | White |
| -15 to -20 | Green | ||
| -10 to -15 | Yellow | ||
| -5 to -10 | Blue | ||
| 0 to -5 | Red |
A colored ring around the lubrication nipple marks the corresponding tolerance group.
