SKF MD63X51X20.5-L hydraulic piston seal. Hydraulic cylinder piston seal — single-acting or double-acting execution. Materials cover filled PTFE, polyurethane, NBR / HNBR elastomer with anti-extrusion back-up ring. Groove dimensions per ISO 7425-1. Standard temperature range -30 to +110 °C for elastomer, -30 to +200 °C for PTFE. Suitable for marine hydraulic winches, deck cranes, steering-gear rams, hatch-cover actuators.
| Type | Hydraulic piston seal |
| Designation | SKF MD63X51X20.5-L |
| HS code | 4016.93 |
| Cylinder bore diameter | 63 mm |
| Piston groove diameter | 51 mm |
| Piston groove width | 20.5 mm |
| Pressure limit, maximum | 25 N/mm² |
| Design | MD-L |
| Primary sealing element | Nitrile Rubber (N80/047) |
| Compound 2 | Acetal (POM POM/076) |
| Compound 3 | Polyester (TPC-ET72/075) |
| Unit system | Metric |
| Product net weight | 0.0297 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.