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Back to IndexAdapter sleeves with inch dimensionsDucts and grooves for oil injection are optional for inch dimension sleeves of 77/8 inch bore and above. These sleeves are not shown in this catalogue. Please consult SKF for more information.

Oil injection equipmentThe equipment required for the oil injection method is also supplied by SKF (fig 7). This includes appropriate pumps to supply oil to the hydraulic nuts (fig 8) used to assist the mounting of bearings with a tapered bore, or for the oil injection method (fig 9 and fig 10) as well as for dismounting using the oil injection method. More detailed information regarding the mounting and dismounting procedures can be found in the online catalogue "Maintenance and Lubrication Products".

Designs for CARB toroidal roller bearings

Where appropriate, modified adapter sleeves of the E, L and TL designs are available for CARB bearings, to prevent the locking device from chafing the cage:

  • With E-design sleeves, the standard KM lock nut and MB locking washer are replaced by a KMFE lock nut (fig 11), and the standard HM 30 lock nut is replaced by an HME lock nut with a recessed outside diameter (fig 12).
  • L-design sleeves (fig 13) differ from the standard design in that the standard KM lock nut and MB locking washer have been replaced by a KML lock nut and MBL locking washer; these have a lower sectional height.
  • With the TL-design sleeve (fig 14), the standard HM .. T lock nut and MB locking washer have been replaced by the corresponding HM 30 lock nut and MS 30 locking clip; these have a lower sectional height.

Design for sealed bearings

When using sealed bearings on adapter sleeves, make sure that the lock nut or locking washer will not damage the seal. Sleeves in the E, C, L or TL designs are suitable for sealed bearings. The locking washer used with the H 3 .. C series adapter sleeve has a protrusion on the side directed towards the bearing (fig 5).

DimensionsThe dimensions of metric SKF adapter sleeves are in accordance with ISO 2982-1:1995; except the bore diameter of metric sleeves for inch shafts.

The dimensions of SKF adapter sleeves with inch dimensions are in accordance with ANSI/ABMA Std. 8.2-1991.

TolerancesThe bore diameter of metric SKF adapter sleeves is to tolerance JS9, the width to h15.

The tolerances of SKF adapter sleeves with inch dimensions are in accordance with ANSI/ABMA Std. 8.2-1991.

ThreadMetric SKF adapter sleeves up to size 40 have metric threads with 6g tolerances, according to ISO 965-3:1998. Larger adapter sleeves have metric trapezoidal threads with 7e tolerances, according to ISO 2903:1993.

SKF adapter sleeves with inch dimensions up to and including size 64 (12 inch shaft diameter) have Unified Special Form threads (based on the old American National form, class 3 design). Larger sleeves have Acme Class 3G, General Purpose threads.

Shaft tolerancesAs the name implies, adapter sleeves adapt themselves to the shaft diameter, so that wider diameter tolerances can be permitted than for 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. Generally, shafts should be to an h9 tolerance but the cylindricity should be to IT5/2 according to ISO 1101:2004.


Bearing accessories | Adapter sleeves | Withdrawal sleeves | Lock nuts | Lock nuts with locking washer or clip | Lock nuts with locking screw | Lock nuts with integral locking device | Precision lock nuts with locking pins | Hydraulic nuts

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This page is still under construction. All bearing information remains the property and copyright of SKF Group.