Sized 13.87 × 20.93 × 3.53 mm (inner × outer × width), the X-Type Seal 13.87×20.93×3.53 NBR seals a 13.87 mm rotating shaft inside a 20.93 mm bore — a size often found in small motors, power tools, pumps and instrument gearboxes.
Specifications
| Inner diameter (shaft) | 13.87 mm |
| Outer diameter (bore) | 20.93 mm |
| Width | 3.53 mm |
| Seal type | X-type — four-lobed radial seal ring |
| Material | NBR – Nitrile |
| Temperature range | -30 °C … +100 °C |
About the X-type profile
Four lobes give two sealing lines in each direction. The X-type profile holds a lubricating film in its grooves, starts with less friction than a compressed O-ring and shrugs off the spiral failure that kills round rings on reciprocating duty.
Material: NBR – Nitrile
NBR (Nitrile) is the standard compound for general industrial sealing. It handles mineral oils, greases and hydraulic fluids, which is why it is the default choice in gearboxes, electric motors and pumps. Keep it away from brake fluid, and store spare seals out of direct sunlight.
If your shaft measures a few tenths of a millimetre under the nominal size, that is normal — the sealing lip is designed with interference for exactly that.
Ordering & delivery
- Sold per piece — no minimum order, priced in US dollars.
- Prices exclude any import duties or taxes; if your customs authority charges them, they are the buyer’s responsibility.
- One flat shipping rate worldwide · tracking number by email.
- Not sure this is the right size? See how to measure an oil seal, or send us your dimensions — pre-sale size checks are free.
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