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Black rubber shaft seal with metal spring, 1.25 in ID, 1.752 in OD, .25 in wide

SKF

SKF 12363 Shaft Seal 1.25 in ID 1.752 in OD 0.25 in Nitrile

SKU CH-QYYW-RRKNQ

Rotary shaft seal with 1.25 in inside diameter, 1.752 in outside diameter and 0.25 in width, nitrile lip rated to 10 psi and 3,600 RPM

  • Precision sealing with nitrile rubber lip material
  • Exact fit for 1.25 in shaft and 1.752 in bore
  • Reliable operation up to 3,600 RPM and 6 m/s surface speed
  • Compatible with oils, fuels, greases and hot water
  • Durable carbon steel spring maintains consistent lip pressure

SKF 12363 Shaft Seal for Rotating Shafts

The SKF 12363 is a rotary shaft seal built for rotating equipment that uses animal or vegetable oils, diesel, gasoline, greases, hot water, light heating oil or mineral oils. It fits a shaft diameter of 1.25 in and a bore of 1.752 in with an overall width of 0.25 in. The CRW1 design uses a single nitrile rubber lip and a carbon steel spring to retain lubricant and exclude contaminants at speeds up to 3,600 RPM.

Press-Fit Installation with Standard Tooling

The seal installs by pressing the acrylic-coated case into the housing bore using a suitable driver or sleeve that contacts the outer case evenly. The 0.25 in width demands accurate axial positioning so the lip seats squarely on the shaft without distortion. Common issues arise when the bore is undersized, the shaft surface is rough or the installation force is applied to the lip instead of the case, which can roll or cut the nitrile material.

Suited for Low-Pressure Rotary Applications

This seal suits maintenance on RV drivetrain components, power take-off units or industrial gearboxes that operate at or below 10 psi and 6 m/s surface speed with compatible fluids. It is not intended for high-pressure hydraulic systems, vacuum service or shafts that exceed the stated speed limit. Buyers needing double-lip exclusion, higher pressure ratings or metric dimensions should select a different design code.

Highlights

  • Precision sealing with nitrile rubber lip material
  • Exact fit for 1.25 in shaft and 1.752 in bore
  • Reliable operation up to 3,600 RPM and 6 m/s surface speed
  • Compatible with oils, fuels, greases and hot water
  • Durable carbon steel spring maintains consistent lip pressure

Specifications

BrandSKF

Questions about this item

How can I confirm the SKF 12363 shaft seal is seated correctly after installation?

After fitting the 1.25 in ID seal into the housing, check that the nitrile lip contacts the shaft evenly and the carbon-steel spring holds uniform tension around the circumference; the acrylic-coated case should sit flush without visible gaps.

What comes with the SKF 12363 and what must I source separately?

The box contains the single CRW1-design rotary shaft seal measuring 1.25 in ID by 1.752 in OD by 0.25 in width; you will need to supply any installation tools, lubricant compatible with nitrile rubber, and the mating shaft or housing.

Which SKF 12363 version suits my application — are there capacity options?

This part number identifies one specific nitrile CRW1 seal rated for 10 psi maximum pressure, 3,600 RPM rotational speed and 6 m/s surface speed; no alternative capacities or lip configurations exist under the same 12363 code.

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