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Transparent rubber shaft seal with metal spring, 1.875 x 2.75 x .313 in

SKF

SKF 18658 Shaft Seal 1.875 x 2.75 x .313 in CRWA1 NBR

SKU CH-RV7J-FCYMD

Rotary shaft seal with 1.875 in bore, 2.75 in OD and .313 in width handles oils, fuels and greases up to 3,060 RPM

  • ColorTransparent
  • Width5/16"
  • Seals shafts reliably with NBR lip material
  • Handles 10 psi pressure for oil containment
  • Fits 1.875 in bore and 2.75 in housing
  • Runs up to 3,060 RPM with carbon-steel spring
  • Resists diesel, gasoline and mineral oils

SKF 18658 Rotary Shaft Seal

The SKF 18658 is a new rotary shaft seal built to the CRWA1 design code with an inside diameter of 1.875 in and an outside diameter of 2.75 in. Its overall width measures .313 in and the lip material is nitrile rubber. A carbon steel spring maintains lip contact and the case carries an acrylic coating. The seal is rated for a maximum pressure of 10 psi and a maximum rotational speed of 3,060 RPM.

Mechanics repairing rotating equipment

This seal suits technicians who need a 1.875 in shaft seal rated for 10 psi and 3,060 RPM with nitrile rubber lips compatible with mineral oils, gasoline, diesel, greases, animal and vegetable oils, light heating oil and hot water. It is not intended for buyers who need a higher pressure rating, a different shaft diameter, a wider profile, or a lip material other than nitrile rubber.

CRWA1 design with dual nitrile lips

The deciding specification is the CRWA1 design code combined with two nitrile rubber lips, a carbon steel spring and an acrylic-coated case, which together define the sealing performance for the listed fluids and the 7.64 mps surface speed limit. This combination determines whether the seal matches the application requirements.

Highlights

  • Seals shafts reliably with NBR lip material
  • Handles 10 psi pressure for oil containment
  • Fits 1.875 in bore and 2.75 in housing
  • Runs up to 3,060 RPM with carbon-steel spring
  • Resists diesel, gasoline and mineral oils

Specifications

BrandSKF
ColorTransparent
Width5/16"

Questions about this item

How can I confirm the CRWA1 seal is seated correctly after installation?

Verify the outside diameter sits flush at 2.75 in against the housing bore and the spring remains visible behind the dual NBR lips.

What comes with the SKF 18658 shaft seal and what must I supply?

The box contains the single CRWA1 rotary seal with acrylic-coated case; you must provide the matching shaft, housing bore, and installation tools.

Which SKF 18658 variant fits a 1.875 in shaft and 2.75 in bore?

The listed 18658 CRWA1 NBR seal matches exactly 1.875 in inside diameter, 2.75 in outside diameter, and .313 in width for that shaft and bore.

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