SKF
Withdrawal Sleeves
SKF withdrawal sleeves are used to mount bearings with tapered bores onto cylindrical stepped shafts, where the shaft has a shoulder for the sleeve to abut against. They feature an external thread at the small end. Mounting uses a hydraulic nut or a dismounting key, and the same mechanism assists in dismounting. Withdrawal sleeves are essential for large bearings where dismounting without a pre-designed extraction aid would be nearly impossible. The AOH (metric) and AOHX (metric, with oil grooves) series are widely used. They protect the shaft and bearing from damage during removal, which is critical for expensive, precision equipment. SKF’s sleeves with oil ducts and grooves further ease large-size dismounting by injecting oil between the sleeve and shaft surfaces.
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Facilitates Bearing Removal
External thread enables hydraulic nut to pull off the bearing.
Suits Shouldered Shafts
Abuts against shaft shoulder for precise axial location.
Hydraulic Integration
Oil grooves allow injection to break metal contacts for removal.
Durable Construction
Hardened and precision-threaded for repeated use.
Metric Standard Sizes
AOH(X) series cover a wide range of bore diameters.
Prevents Shaft Damage
Controlled dismounting avoids scoring or brinelling.
Using Withdrawal Sleeves with Hydraulic Nuts for Dismounting
Attach an SKF hydraulic nut to the withdrawal sleeve thread, apply pressure until the bearing inner ring slides off the taper. The oil injection method (using the sleeve’s oil groove) further eases removal by creating a thin lubricating film, reducing force.
Comparison: Adapter Sleeves vs. Withdrawal Sleeves
Use adapter sleeves for plain, non-shouldered shafts where axial location is optional or set by locknut. Use withdrawal sleeves on stepped shafts where a positive shoulder provides reliable location and easy extraction is needed for maintenance.