|Metric series||Inch series|
|Dimension standards||ISO 2982-1:1995, except for the bore diameter of sleeves for inch shafts||ANSI/ABMA Std. 8.2:1991|
|Tolerances||Bore diameter: JS9
||1:12 as standard
1:30 as standard in the 40 and 41 dimension series
For additional information, contact the SKF application engineering service.
||Bore diameter < 200 mm
(size ≤ 40): metric thread in accordance with ISO 965-3:1998, matching the appertaining SKF lock nut
Bore diameter ≥ 200 mm
(size ≥ 44): metric trapezoidal thread in accordance with ISO 2903:1993, matching the appertaining SKF lock nut
|Bore diameter ≤ 12 in.
(size ≤ 64): Unified Special Form ANSI/ASME B1
Bore diameter ≥ 12 7/16 in.
(size ≥ 68): ACME thread class 3G
Cylindricity: IT5/2 – ISO 1101:2012
Adapter sleeves adapt to the shaft diameter, so that wider diameter tolerances can be permitted compared to the seat of a bearing with a cylindrical bore. However, the form tolerances must be kept within narrow limits as the accuracy of form directly affects the running accuracy of the bearing.