Removal sleeves
Withdrawal sleeves are externally tapered sleeves used to fix tapered-bore spherical roller bearings (such as self-aligning roller bearings) to a cylindrical shaft. They are driven between the shaft and the bearing inner ring to create an interference fit, and for removal, a withdrawal nut is fitted to the thread at the sleeve end to pull the sleeve out and release the bearing. They are used in configurations where the bearing is positioned against the shoulder of a stepped shaft. The standard outer taper ratio is 1:12, and 1:30 is also used for wide bearing series. Large sizes are equipped with oil holes and oil grooves, and are combined with oil injection or hydraulic nuts to ease removal. They are used in equipment requiring frequent maintenance, such as rolling mills and large rotating machinery.
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Removal sleeves
Withdrawal Sleeve (AH and AHX Series)
Withdrawal sleeve inserted into the bearing bore to remove the bearing using a hydraulic nut. Shaft diameter range 35 mm to 260 mm.
SKF
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Removal sleeves
Withdrawal Sleeves (AOH / AOHX)
Sleeve inserted into the bore of a bearing and used together with a hydraulic nut to remove the bearing. Available in many sizes with bore diameters from 460 mm to 1060 mm or more.
SKF
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Removal sleeves
Withdrawal Sleeve
A sleeve pressed into the bore of a tapered-bore bearing inner ring when mounting the bearing onto the cylindrical seat of a stepped shaft.
SKF
How to choose Removal sleeves
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1. Select inner diameter d1 to match shaft diameter
The inner diameter d1 is the applicable shaft diameter. Listed products range from 35 to 1060 mm. Also confirm that shaft machining can meet the recommended shaft tolerance and cylindricity. Poor roundness or cylindricity causes uneven interference, which can lead to inner ring cracking or creep (slip rotation).
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2. Match outer diameter d to bearing bore
The outer diameter d is the nominal outer diameter of the tapered section and corresponds to the bore of the bearing to be combined. Even for the same shaft diameter, the outer diameter and width vary by bearing series. Therefore, verify the combination with the bearing to be used against the applicable bearing series and bearing number table when selecting.
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3. Match taper ratio to the bearing
The outer taper ratio of the sleeve must match the tapered bore of the bearing inner ring. Generally it is 1:12, and wide series (such as the 240 and 241 series) use 1:30. A mismatched taper ratio will not clamp correctly and internal clearance cannot be adjusted properly. Check against the suffix of the bearing number (K or K30).
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4. Check width B1 and shaft mounting length
Width B1 is the total width of the sleeve. It equals the bearing width plus the press-in allowance and nut engagement allowance, so confirm it fits within the dimension from the shoulder of the stepped shaft to the shaft end. If it does not fit, the bearing cannot be pushed to its specified position.
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5. Match thread size and withdrawal nut
During removal, the withdrawal nut is fitted to the thread on the sleeve and used to pull it out. Confirm the thread designation and applicable nut number, and arrange the nut at the same time. Generally, small sizes use metric threads, and large sizes with inner diameter of 190 mm or more use trapezoidal threads.
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6. Select hydraulic-removal type for large sizes
Large bearings have high clamping force, making mechanical extraction difficult. Selecting the H-type model with oil holes and oil grooves (such as AOH) allows pressure oil to be injected to relieve the interference. Combined with a hydraulic nut, it reduces the maintenance workload.
This guide was written by AI based on the listed products' documents and specification items. Check each manufacturer's documents before adopting.