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SKF 21061 rotary shaft seal, transparent nitrile rubber, 2.125 in ID, 2.75 in OD, .5 in wide

SKF

SKF 21061 Shaft Seal 2.125 x 2.75 x .5 in

SKU CH-8PQ5-MTJ5P

Rotary shaft seal with 2.125 in inside diameter and 2.75 in outside diameter for oils, greases and fuels up to 880 RPM

  • ColorTransparent
  • Width1/2"
  • Reliable sealing with nitrile rubber lips
  • Handles up to 2,880 RPM for engine use
  • Resists oil, fuel and grease effectively
  • Double-lip design blocks contaminants securely
  • Spring-loaded carbon steel maintains constant pressure

SKF 21061 Shaft Seal

The SKF 21061 is a rotary shaft seal designed for engine and drivetrain sealing tasks. It features a CRWA1 design code with an inside diameter of 2.125 in and an outside diameter of 2.75 in. The overall width measures .5 in and uses a double-lip nitrile rubber contact seal. A carbon steel spring maintains consistent lip pressure against the shaft.

Replaces worn original seals

This seal fits shafts measuring 2.125 in where the housing bore is 2.75 in and the groove width is .5 in. It handles fluids including gasoline, diesel, mineral oils, greases, hot water, light heating oil, and animal or vegetable oils. The maximum pressure rating is 10 psi and maximum rotational speed is 2 880 RPM. The jump is worth it when the old seal leaks, hardens, or the lip groove shows wear.

Suits repair shops and DIY mechanics

Mechanics servicing gearboxes, pumps, or axle housings with these exact dimensions will find it a direct fit. Builders who need a different shaft diameter, bore size, or width should look at other SKF references. The seal is not intended for pressures above 10 psi or surface speeds beyond 8.15 mps.

Highlights

  • Reliable sealing with nitrile rubber lips
  • Handles up to 2,880 RPM for engine use
  • Resists oil, fuel and grease effectively
  • Double-lip design blocks contaminants securely
  • Spring-loaded carbon steel maintains constant pressure

Specifications

BrandSKF
ColorTransparent
Width1/2"

Questions about this item

What bore diameter does the 2.125 in shaft seal fit?

The seal installs into a 2.75 in bore and seats on a 2.125 in shaft, so the housing must accept the 2.75 in outside diameter.

Which way round does the CRWA1 seal go, and what step is often missed?

The carbon-steel spring side faces the fluid; press the 0.5 in wide case squarely until the acrylic-coated shell bottoms out, and lubricate the nitrile lips before sliding over the shaft.

When should the nitrile lip seal be replaced?

Replace it if leakage appears, the lip hardens or cracks from heat, or after the shaft exceeds 2,880 rpm or 8.15 m/s surface speed for extended periods.

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