SKF MD30X21X13.5-L — Hydraulic piston seal
SKF · Seals & Gaskets · Hydraulic Piston Seals
SKF MD30X21X13.5-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. 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
- MD30X21X13.5-L
- 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Also known as — OEM cross-references & superseded numbers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 3021135
- Parker 3021135
- Freudenberg 3021135
- Hallite 3021135
- Competitor equivalent: 3021135 (Trelleborg)
- Competitor equivalent: 3021135 (Parker)
- Competitor equivalent: 3021135 (Freudenberg)
- Competitor equivalent: 3021135 (Hallite)
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