SKF PTB312-2125-375-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.
| Type | Hydraulic rod seal / buffer seal |
| Designation | SKF PTB312-2125-375-J1S |
| HS code | 4016.93 |
| Rod diameter | 53.98 mm |
| Housing groove diameter | 69.82 mm |
| Housing groove width | 10.48 mm |
| Pressure limit, maximum | 40 N/mm² |
| Design | PTB |
| Primary sealing element | Polyurethane (TPU U-1003) |
| Compound 2 | Nitrile Rubber (NBR A-8501) |
| Unit system | Inch |
| Product net weight | 0.025 kg |
| eClass code | 23-07-01-90 |
| UNSPSC code | 31181602 |
| Material | As declared by SKF designation suffix |
| Temperature range | Per SKF product data |
| Primary standard | SKF designation convention (see description for governing ISO / DIN) |
| MOQ | 1 |
Interchange with peer OEM equivalents on identical boundary plan and execution — confirm cage, clearance, sealing and precision-class suffix before substitution.