We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
SKF 4985 shaft seal, translucent nitrile rubber ring with metal case, .5 in ID .999 in OD .25 in wide

SKF

SKF 4985 CRWA1 Shaft Seal 0.5 x 0.999 x 0.25 in Nitrile Rubber

SKU CH-B8VD-8H6SQ

Rotary shaft seal with 0.5 in inside diameter, 0.999 in outside diameter, 0.25 in width, nitrile rubber lips, carbon steel spring, rated to 10 psi and 3,420 RPM

  • ColorTransparent
  • SKF brand trusted for reliable sealing performance
  • CRWA1 design with dual lips blocks leaks effectively
  • Nitrile rubber lip resists oil, fuel, water and grease
  • 5 in ID × 0.999 in OD × 0.25 in width fits precise shaft dimensions
  • Rated for 420 RPM and 2.28 m/s surface speed

SKF 4985 CRWA1 Rotary Shaft Seal

This SKF rotary shaft seal suits maintenance on engines and rotating equipment where a 0.5 in shaft requires sealing. The CRWA1 design handles common automotive fluids including gasoline, diesel, mineral oils and greases. Mechanics and plant technicians fitting original-spec replacements will find the dimensions match the 4985 part number.

Nitrile rubber lips with carbon steel spring

Dual nitrile rubber lips and a carbon steel garter spring maintain contact pressure up to 10 psi. The acrylic-coated case resists corrosion during installation and service. An inch-series 0.999 in outside diameter and 0.25 in overall width allow direct fit into standard bores without machining changes.

Replaces worn seals on 0.5 in shafts

Use this seal when leakage appears at the shaft exit or during scheduled overhauls of pumps, gearboxes or engine accessories. The 3,420 RPM and 2.28 m/s speed ratings cover typical light-duty rotating applications. It is not suited for high-pressure hydraulic systems or shafts larger than the stated inside diameter.

Highlights

  • SKF brand trusted for reliable sealing performance
  • CRWA1 design with dual lips blocks leaks effectively
  • Nitrile rubber lip resists oil, fuel, water and grease
  • 5 in ID × 0.999 in OD × 0.25 in width fits precise shaft dimensions
  • Rated for 420 RPM and 2.28 m/s surface speed

Specifications

BrandSKF
ColorTransparent

Questions about this item

What rotational speed does the CRWA1 design cap at?

The CRWA1 seal is rated for a maximum rotational speed of 3,420 RPM and a maximum surface speed of 2.28 mps.

What shaft and bore diameters does the 0.5 x 0.999 x 0.25 in seal require?

It fits a 0.5 in shaft and a 0.999 in housing bore with a 0.25 in overall width.

How is the nitrile rubber lip installed and what step is often missed?

Press the seal evenly into the bore with the spring side facing the fluid; the step often missed is lubricating the lip and shaft before installation to prevent dry-start damage.

Also in this aisle

People compared these

Same shelf, same checkout — eight coins and a 30-minute rate lock.