Self-centred freewheels are models used as intermittent, backstop and overspeed supported by bearings or bushings integrated in the wheel body.
 

GF wheels (sizes 8-130) are steel-on-steel (sizes 8-20) or bearing-mounted (sizes 25-130) freewheels which are mainly used inside closed casings and can be lubricated with either oil or grease.
 

The GL wheels (sizes 12-150) are oil and grease lubricated bearing-centred freewheels which can be supplied with a wide range of end caps and fixing flanges or in combination with a flexible coupling (GL.TR). They are mainly used on the outside of housings, e.g. in combination with pulleys or shaft ends, and are lubricated with both oil and grease.
 

The GLG (sizes 25-80) are free running wheels with bearing-centred contact body cages supplied with for-life grease lubrication and used in applications requiring long periods of idle operation at high speeds. Can be fitted with all accessories available for the GL series (flanges, covers and flexible couplings)
 

GO are freewheels with contact body cages centred on bearings supplied with for-life grease lubrication available with both metric and inch bore (see catalogue page for available bores)

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GV (sizes 20-120) are self-centred freewheels on bushings supplied with for-life lubrication used mainly as backstops on shaft ends due to the locking bracket mounted on the outer ring

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GVG (sizes 20-90) are for-life lubricated, bushing-centred freewheels with contact body cages which are mainly used as backstops on the shaft ends due to the locking bracket mounted on the outer ring. Unlike GVs they are used for applications requiring long periods of idle operation

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The UK (sizes 8-40) are contact body freewheels with integral single-row ball bearing supplied with for-life grease lubrication. They have the same dimensions as the 62. series bearings and are available in versions without keyway (UK), with keyway on the inner ring (UKC) and with keyway on both inner and outer ring (UKCC) with either ZZ dust seal or 2RS sealing (see catalogue for available bore sizes in the various configurations)

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The CKN (sizes 20-25-30) are loose contact body wheels with integral single-row ball bearing supplied with for-life grease lubrication. They are only available with inner ring groove and sealed 2RS and are used instead of UKC..2RS if a wheel with smaller axial clearance is required.