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SKF linear bearing unit LUNF

Self-aligning | Open design | Clearance adjustable | 12 - 50 mm

The SKF linear bearing unit LUNF consists of a solid extruded aluminium housing provided with a SKF ball bearing LBCF inside. The LBCF D is self-aligning up to +/- 0,5º. This tilting feature compensates for misalignment, which may be caused by inaccuracies in fitting or manufacturing, or by significant bending of an unsupported shaft. This ball bearing is manufactured according to ISO 10285 and therefore interchangeable on all ISO-compliant brands. The LUNF has a slotted housing with an adjustment screw. With the purchase of a complete LUNF bearing unit, you get a complete bearing including bearing house which is ready to be installed. This makes the LUNF great if you like to buy a ready-made bearing. In contrast tot the LUC. versions of SKF, the aluminium housing of the LUN. versions comprises the entire bearing. This decreases the risk of pollution and ensures that LUN. versions can be mounted differently. The bearing unit is provided with pre-drilled holes on the bottom so that it can be secured to prevent movement. Thanks to the open design of both the housing and the bearing, the LUNF is suitable for shafts with shaft support.

The SKF linear bearing unit LUNF is available in sizes between 12 and 50 mm. For each size there are two different versions available so you always get the appropriate bearing unit. If you are unsure which version is the most suitable, the differences are indicated below. If you are still in doubt you can always contact us on +31 (0)85 – 0661258.

Which SKF linear bearing unit LUNF do I need:

SKF offers two different versions of the linear bearing unit LUNF per diameter size. It is therefore important to make a choice for the inner diameter first. If you want to replace a defective or damaged bearing unit, we recommend you to look at the code indicated in the bearing unit and to order the same new bearing unit.

And last, there is a choice to be made between a bearing -2LS with double lip seals or without seals. The advantage of a two-sided sealed bearing is that it is extra maintenance-friendly. This is because you don’t need to worry about the amount or type of grease to be used. It is also no longer necessary for you to provide the bearings with new grease. Also, the bearings are protected against dust, dirt and moisture. The downside is that these seals provide some friction. This means that about 30% of the power will be lost, it is important to take this into account (bearings with two seal have the code -2LS).


The two different SKF linear bearing unit LUNF versions briefly explained:

  • LUNF: The standard version of the powerful SKF linear bearing unit LUNF
  • LUNF-2LS: Features a two-sided seal, enabling it to be used in a dusty environment.
SKF linear bearing unit LUNF

From: €62.45
Available within 72 hours
(This may differ by variant)


CAD LUNF bearing unit
Standard implementation (Fw)2 double lip sealsWidth (L)Heart size (H)Length (A)Dynamic load ratingsStatic load ratings
LUNF 12LUNF 12-2LS43 mm18 mm32 mm1080 N815 N
LUNF 16LUNF 16-2LS53 mm22 mm37 mm1320 N865 N
LUNF 20LUNF 20-2LS60 mm25 mm45 mm2000 N1370 N
LUNF 25LUNF 25-2LS78 mm30 mm58 mm2900 N2040 N
LUNF 30LUNF 30-2LS87 mm35 mm68 mm4650 N3250 N
LUNF 40LUNF 40-2LS108 mm45 mm80 mm7800 N5200 N
LUNF 50LUNF 50-2LS132 mm50 mm100 mm11200 N6950 N
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SKF Bearings

SKF is the worldwide leader in the field of bearing technology. The company had acquired this positions thanks to the excellent quality and serviceability of its bearings. The company offers all kinds of bearings from a deep groove ball bearing to a cylindrical roller bearing and from a linear ball bearing to a linear shaft support block. With the purchase of a SKF bearing you are sure to have bought top quality.