SKF PTB-45X56X7.7-J1S — Hydraulic rod seal / buffer seal
SKF · Seals & Gaskets · Hydraulic Rod & Buffer Seals
SKF PTB-45X56X7.7-J1S hydraulic rod seal / buffer seal. Hydraulic cylinder rod-side sealing element — primary rod seal (PU / thermoplastic polyurethane, filled PTFE, elastomer) or upstream buffer seal absorbing pressure spikes. Rated to 400-700 bar depending on execution. Groove per ISO 5597 / ISO 7425-2. Suitable for deck cranes, hatch covers, steering gear, hydraulic winches. Designation follows the SKF alphanumeric identification convention where the numeric block encodes the boundary plan and the suffix declares execution options (material, sealing, cage, precision, clearance, lubricant). Genuine SKF supply carries the SKF logo etch or moulded mark and hologram-authenticated packaging.
Specifications
- Part number
- PTB-45X56X7.7-J1S
- HS code
- 4016.93
- Material
- As declared by SKF designation suffix
- Temperature range
- Per SKF product data
- Standard
- SKF designation convention (see description for governing ISO / DIN)
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Also known as — OEM cross-references & superseded numbers
- Trelleborg 4556771
- Parker 4556771
- Freudenberg 4556771
- Hallite 4556771
- Competitor equivalent: 4556771 (Trelleborg)
- Competitor equivalent: 4556771 (Parker)
- Competitor equivalent: 4556771 (Freudenberg)
- Competitor equivalent: 4556771 (Hallite)
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