SKF 11378 Shaft Seal 1.125 x 2.25 x .25 in CRW1 Nitrile
Rotary shaft seal with 1.125 in inner diameter, 2.25 in outer diameter and .25 in width for oils, fuels and greases up to 10 psi
- Product colorTransparent
- Overall width1/4 in
- Seals shafts reliably with nitrile rubber lip
- Fits 1.125 in bore and 2.25 in housing
- Handles 3,720 RPM for high-speed applications
- Resists oil, fuel and hot water exposure
- CRW1 design with carbon-steel spring maintains contact
SKF 11378 Shaft Seal Specifications
The SKF 11378 is a CRW1 rotary shaft seal built for engine repair and maintenance. It fits a 1.125 inch shaft inside a 2.25 inch bore with a .25 inch width. Mechanics and technicians use it to retain lubricants and exclude contaminants in rotating assemblies.
Pressure and Speed Limits
This nitrile rubber lip seal handles a maximum pressure of 10 psi. It is rated for surface speeds up to 5.57 mps and rotational speeds up to 3,720 RPM. The design suits animal and vegetable oils, diesel, gasoline, greases, hot water, light heating oil and mineral oils. Exceeding these limits can cause premature lip wear or leakage.
Installation Notes
Press the seal squarely into the bore using a suitable driver to avoid cocking the metal case. The carbon steel garter spring must stay seated behind the lip during assembly. Nitrile material resists the listed fluids, but chemical attack or shaft damage often causes early failure if surfaces are not clean and within tolerance.
How it compares
Measured against everything we stock in Engine Service & Diagnostic Tools, at today’s prices. Recalculated every night.
- Price $12.99
- Cheaper than about 75% of the 1,113 comparable items (median $19.99).
Specifications
| Product | |
|---|---|
| Brand name | SKF |
| Product color | Transparent |
| Size & build | |
| Overall width | 1/4 in |
Questions about this item
Which shaft seal dimensions match my application?
The SKF 11378 has a 1.125 in inside diameter, 2.25 in outside diameter and 0.25 in overall width.
What does the 3,720 RPM rating mean once the seal is installed?
It is the maximum rotational speed the CRW1 design can sustain without exceeding the lip material limits.
How does the nitrile lip and 10 psi pressure cap affect fluid sealing?
The single nitrile lip with carbon-steel spring handles animal and vegetable oils, diesel, gasoline, greases, hot water, light heating oil and mineral oils up to 10 psi.
More in Engine Service & Diagnostic Tools
