SKF OR21.95X1.78-N70 — O-ring / back-up ring
SKF · Seals & Gaskets · O-Rings & Back-up Rings
SKF OR21.95X1.78-N70 o-ring / back-up ring. SKF O-ring in nitrile (NBR), hydrogenated nitrile (HNBR), fluoroelastomer (FKM / Viton), ethylene-propylene (EPDM) or silicone (VMQ). Dimensioned to AS 568A imperial, ISO 3601 metric, or JIS B 2401. Companion PTFE / thermoplastic back-up rings extend service pressure to 700 bar in dynamic hydraulic applications by preventing extrusion into the sealing gap. 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
- OR21.95X1.78-N70
- 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Also known as — OEM cross-references & superseded numbers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 219517870
- Parker 219517870
- Freudenberg 219517870
- Garlock 219517870
- Competitor equivalent: 219517870 (Trelleborg)
- Competitor equivalent: 219517870 (Parker)
- Competitor equivalent: 219517870 (Freudenberg)
- Competitor equivalent: 219517870 (Garlock)
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