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Transparent nitrile rubber shaft seal with metal spring, 3-7/8 by 4-63/64 by 3/8 inches

SKF

SKF 38692 Shaft Seal CRWA1 NBR 3-7/8 x 4-63/64 x 3/8

SKU CH-THGD-17RNY

A CRWA1 rotary shaft seal in nitrile rubber with 3.875 in inside diameter, 4.999 in outside diameter and .375 in width for oils, fuels, greases and hot water up to 10 psi and 2,040 RPM

  • ColorTransparent
  • Width3/8"
  • Seals 3.875 in shafts against leaks with NBR lip material
  • Handles 10 psi pressure for reliable fluid containment
  • Resists animal oils, diesel, gasoline, greases and hot water
  • Operates up to 2,040 RPM with carbon steel spring
  • Fits 4.999 in bore with 0.375 in width

SKF 38692 Shaft Seal CRWA1 NBR

This SKF 38692 rotary shaft seal uses a CRWA1 design with nitrile rubber lips. It fits shafts with a 3.875 in inside diameter and a 4.999 in bore. The seal handles animal and vegetable oils, diesel, gasoline, greases, hot water, light heating oil and mineral oils. It is built for new engine service work.

Dual-lip seal with carbon-steel spring

The acrylic-coated case presses into the housing bore to seal the outside diameter. Two lips and a carbon-steel garter spring maintain contact pressure on the shaft. The assembly tolerates up to 10 psi and surface speeds of 10.58 mps at 2 040 RPM. The 0.375 in overall width leaves room for standard retaining features.

Replaces worn lip seals on rotating shafts

Install this seal when an original lip seal leaks or hardens from heat and chemical exposure. The nitrile material resists the listed fluids better than aged original rubber. The jump is worth it when the shaft surface is still smooth and the bore is within tolerance. It is not for applications exceeding the pressure or speed limits.

Highlights

  • Seals 3.875 in shafts against leaks with NBR lip material
  • Handles 10 psi pressure for reliable fluid containment
  • Resists animal oils, diesel, gasoline, greases and hot water
  • Operates up to 2,040 RPM with carbon steel spring
  • Fits 4.999 in bore with 0.375 in width

Specifications

BrandSKF
ColorTransparent
Width3/8"

Questions about this item

How long will the 0.375 in wide NBR lip last at the 2,040 RPM limit?

The nitrile rubber lip is rated for 2,040 RPM and 10.58 m/s surface speed; life depends on shaft finish, lubrication and temperature in your application.

How hot does the seal run when it spins continuously at 2,040 RPM?

Frictional heat at the rated 10.58 m/s surface speed is modest; the NBR material handles normal operating temperatures for the listed fluids without overheating.

What shaft diameter and tolerance are needed for the 3.875 in inside diameter?

The seal fits a 3.875 in shaft; the mating surface must meet standard rotary-seal finish and hardness specs for the CRWA1 design to seal properly.

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