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SKF 9878 nitrile shaft seal 1 x 1.499 x .25 in transparent finish

SKF

SKF 9878 Shaft Seal CRWA1 Nitrile 1 x 1.499 x .25 in

SKU CH-NKRF-1J90B

Rotary shaft seal with nitrile lips rated to 10 psi and 840 RPM for oils, grease, gasoline and hot water

  • ColorTransparent
  • Seals shafts against leaks with nitrile rubber lips
  • Handles oils, fuels, greases and hot water
  • Withstands up to 10 psi operating pressure
  • Rated for 3,840 RPM maximum rotational speed
  • Carbon-steel spring maintains consistent lip contact

SKF 9878 Rotary Shaft Seal

The SKF 9878 is a CRWA1-design rotary shaft seal built for 1 inch shafts with a 1.499 inch bore. Its nitrile rubber lips handle animal and vegetable oils, diesel, gasoline, greases, hot water, light heating oil and mineral oils. A carbon-steel garter spring maintains lip tension up to 3,840 rpm and 5.09 m/s surface speed.

Press-fit installation with acrylic-coated case

The seal presses into the housing bore; the acrylic coating on the metal case helps prevent bore corrosion and eases removal later. Ensure the shaft surface is clean, free of nicks and within recommended finish limits so the twin lips can seat without damage. Misalignment or a rough shaft finish are the most common causes of early leakage.

Suits rotary equipment needing 10 psi static sealing

This seal fits pumps, gearboxes and motors where the fluid is compatible with nitrile and pressure stays at or below 10 psi. It is not intended for high-pressure hydraulic systems, aggressive chemicals outside the listed fluid types or shafts larger than 1 inch. Buyers needing higher pressure ratings or different lip materials should look at alternative seal designs.

Highlights

  • Seals shafts against leaks with nitrile rubber lips
  • Handles oils, fuels, greases and hot water
  • Withstands up to 10 psi operating pressure
  • Rated for 3,840 RPM maximum rotational speed
  • Carbon-steel spring maintains consistent lip contact

Specifications

BrandSKF
ColorTransparent

Questions about this item

How can I confirm the SKF 9878 shaft seal is seated correctly after installation?

After fitting, the seal should sit flush in the bore with the spring visible behind the primary lip; rotate the shaft by hand — it should turn smoothly with only light drag from the nitrile lips and no binding.

What comes with the SKF 9878 seal and what must I supply separately?

The box contains the single CRWA1 rotary shaft seal (nitrile lips, carbon-steel spring, acrylic-coated case); you must provide the correct installation driver, clean lubricant compatible with mineral oils or grease, and a shaft measuring 1 in diameter with a 1.499 in bore.

Which SKF 9878 variant should I select for my application?

Only the 9878 part number is offered — it has a 1 in inside diameter, 1.499 in outside diameter, 0.25 in width, dual nitrile lips, 10 psi pressure rating and 3,840 RPM limit; choose it when those exact dimensions and fluid compatibility match your requirements.

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