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Black rubber shaft seal with metal spring, 1 inch inner diameter, 1.752 inch outer diameter, .25 inch wide

SKF

SKF 9998 Shaft Seal CRWA1 Nitrile 1 x 1-3/4 x 1/4

SKU CH-63H1-0Q1RS

Rotary shaft seal with nitrile rubber lips, 1 in bore and 1.752 in OD, rated to 3,840 RPM and 10 psi for oils, grease and fuels

  • Nitrile lip handles animal and vegetable oils, diesel, gasoline, greases, hot water, light heating oil, mineral oils
  • Twin-lip CRWA1 design rated to 10 psi and 3,840 RPM for reliable rotary sealing
  • 1 in ID × 1.752 in OD × .25 in width fits standard inch-dimension shafts
  • Acrylic-coated case resists corrosion in harsh fluid environments
  • Carbon-steel spring maintains consistent lip contact at up to 5.09 m/s surface speed

SKF 9998 Rotary Shaft Seal

The SKF 9998 is a CRWA1-design rotary shaft seal built for industrial and automotive rotating equipment. It fits a 1-inch shaft inside a 1.752-inch bore with an overall width of 0.25 inch. The nitrile rubber lips handle animal and vegetable oils, diesel, gasoline, greases, hot water, light heating oil and mineral oils.

Double-Lip Nitrile Construction

Two nitrile lips with a carbon-steel spring maintain contact pressure up to 10 psi. The acrylic-coated case resists corrosion during installation and service. This combination extends seal life in contaminated or splash-prone environments where single-lip designs can leak.

3,840 RPM Speed Limit

The seal is rated for 3,840 RPM and a maximum surface speed of 5.09 mps. Applications that exceed these speeds or require higher pressure ratings should use a different seal design. Buyers needing metric dimensions or alternative lip materials must select another part number.

Highlights

  • Nitrile lip handles animal and vegetable oils, diesel, gasoline, greases, hot water, light heating oil, mineral oils
  • Twin-lip CRWA1 design rated to 10 psi and 3,840 RPM for reliable rotary sealing
  • 1 in ID × 1.752 in OD × .25 in width fits standard inch-dimension shafts
  • Acrylic-coated case resists corrosion in harsh fluid environments
  • Carbon-steel spring maintains consistent lip contact at up to 5.09 m/s surface speed

Specifications

BrandSKF

Questions about this item

How often will the nitrile lips need replacement on the SKF 9998 seal?

The nitrile lips are designed for continuous contact with oils and greases; replacement intervals depend on shaft condition, fluid cleanliness and operating hours rather than a fixed schedule.

What is the first limit reached during sustained high-speed operation of this 1.752 in OD seal?

The maximum rotational speed of 3,840 RPM or the surface speed of 5.09 mps will be reached before the 10 psi pressure rating becomes a constraint.

How much heat and power loss should I expect when the CRWA1 seal runs all day at 3,840 RPM?

At the rated speed the seal generates only frictional heat from the twin nitrile lips and carbon-steel spring; no external power is consumed and temperature rise stays within normal nitrile operating limits.

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