FYH Metric adapter sleeves, 25mm

FYH H2300 series is a metric adapter sleeve (also spelt adaptor sleeve) for mounting a tapered bore bearing on a plain shaft. Choose the size from the Bore (mm) drop-down. The last two digits of the sleeve number are the bearing bore code, so UK206, UKX06 and UK306 inserts all use an H2306 on a 25mm shaft. Each adapter is a slotted sleeve with a lock nut and a lock washer. The insert bearing and the adapter are separate items, so order both.

Where this product is used

• Mounting UK200, UKX00 and UK300 tapered bore insert bearings on plain shafts
• Pillow block (plummer block), flange and take-up bearing units that use UK series inserts
• Equipment exposed to vibration or impact, where adapter fixing of the bearing is used

Features

• Slotted adapter sleeve with a lock nut and a lock washer: the washer tab engages the sleeve slot and one tab is bent into a slot in the nut to lock it
• Tapered bore with adapter gives 360-degree shaft contact along the whole length of the bearing inner ring
• Suited to applications where shock loads could damage other locking devices
• A looser shaft fit is allowed with an adapter sleeve: h8 or h9 shaft tolerance is recommended
• Sleeve, lock nut and lock washer part numbers, overall length, lock nut size, mass and the matching UK bearings are given for each size in the table

Key specifications

Fitting and use

Shaft: check the shaft for bends, burrs and other flaws before fitting. A looser shaft fit is allowable with an adapter sleeve: the recommended shaft tolerance is h8 or h9 (for example, a 50mm shaft is 0 to -39 µm at h8 or 0 to -62 µm at h9).

Fitting: slide the adapter sleeve onto the shaft at the bearing position; if it is too tight, open the slot with a screwdriver. Slide the bearing onto the sleeve, place a cylindrical reinforcing ring against the front face of the inner ring, and seat the sleeve by tapping lightly around its back. Fit the lock washer with its tab in the sleeve slot, then screw the lock nut on by hand with the tapered side facing the bearing.

Tightening: a lock nut that is too loose lets the sleeve slip, which wears the shaft and the bearing. A lock nut that is too tight expands the inner ring and reduces the internal clearance, which can cause overheating and early failure. Reference lock nut torques for UK, UKX and UK300 bearings by bore code, for standard and heavy load; the reference figures for each size are in its Model Details.

Choosing the right option

Match the sleeve to the bearing as well as the shaft. The last two digits of the sleeve number are the bearing bore code (UK206, UKX06 and UK306 all use the H2306), and the bearings for each size are shown in the table.

H2313 and H2314 both have a 60mm bore: choose by model number, not by shaft size alone.

For inch shafts use the HE2300 series. The UK insert bearing is a separate item: add the UK200 series insert or the UK300 series insert.

See also: FYH UK200 series tapered bore insert bearings, FYH UK300 series tapered bore insert bearings, P200 series pillow block housings, P300 series pillow block housings.