SKF PHFFX51-28X55 — Keyless shaft bushing / locking assembly
SKF · Bearings & Power Transmission · Keyless Shaft Bushings
SKF PHFFX51-28X55 keyless shaft bushing / locking assembly. Frictional shaft-to-hub coupling that transmits torque without a key or splined joint, by radial-elastic clamping between the shaft and hub. Executed as a double-taper collet (self-centring), a single-taper Ringfeder-style assembly, or a stepped-piston hydraulic clamp. Removed and re-installed non-destructively; excellent choice for high-precision or high-torque locations where a keyway would fatigue the shaft. Designation follows the SKF alphanumeric identification convention where the numeric block encodes the boundary plan and the suffix declares execution options.
Specifications
- Part number
- PHFFX51-28X55
- HS code
- 8483.60
- Material
- As declared by SKF designation suffix
- Temperature range
- Per SKF product data
- Standard
- SKF designation convention
Compatibility
Interchange with peer OEM equivalents on identical boundary plan and execution — confirm cage, clearance, sealing and precision-class suffix before substitution.
Also known as — OEM cross-references & superseded numbers
- Ringfeder 512855
- Fenner 512855
- KTR 512855
- Tollok 512855
- Competitor equivalent: 512855 (Ringfeder)
- Competitor equivalent: 512855 (Fenner)
- Competitor equivalent: 512855 (KTR)
- Competitor equivalent: 512855 (Tollok)
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