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Transparent nitrile rubber shaft seal, double-lip design with carbon steel spring and acrylic-coated case

SKF

SKF 29907 Shaft Seal CRWA1 Nitrile Rubber 3 x 4 x 3/8

SKU CH-KXQT-3XZ5N

Rotary shaft seal with nitrile rubber lips rated for 10 psi and 2,400 RPM

  • ColorTransparent
  • Width3/8"
  • CRWA1 design handles 10 psi pressure
  • Nitrile rubber lip resists oil and fuel
  • 2 400 RPM max speed for engine use
  • 3 x 4 x .375 in size fits shaft
  • Carbon steel spring maintains seal tension

SKF 29907 Shaft Seal CRWA1 Nitrile Rubber

This SKF rotary shaft seal suits maintenance crews and OEM rebuilds where a 3-inch bore and 4.003-inch housing meet. The CRWA1 design with twin nitrile lips handles animal and vegetable oils, diesel, gasoline, greases, hot water, light heating oil and mineral oils.

Thermals Noise and Power Draw

As a static elastomer component the seal generates no heat, draws no power and produces no audible noise during operation. Its acrylic-coated case and carbon-steel garter spring maintain lip contact up to 2,400 RPM and 9.55 m/s surface speed while limiting system pressure to 10 psi.

Bundled Accessories and Software

The unit ships as a single seal with no supplementary hardware, installation tools or software; fitment relies on standard press-in procedures and the user’s own lubricant compatible with the listed fluid types.

Highlights

  • CRWA1 design handles 10 psi pressure
  • Nitrile rubber lip resists oil and fuel
  • 2 400 RPM max speed for engine use
  • 3 x 4 x .375 in size fits shaft
  • Carbon steel spring maintains seal tension

Specifications

BrandSKF
ColorTransparent
Width3/8"

Questions about this item

How do I press the 4.003 in outside diameter seal into the housing without damaging the acrylic case coating?

Use a flat press plate that contacts only the outer metal case, apply even force, and stop when the seal face is flush with the housing shoulder; tapping the lip directly tears the nitrile rubber.

When should I plan to replace the nitrile rubber lips given the 10 psi maximum pressure and 2,400 RPM limit?

Inspect the two lips at every oil change; replace the seal if you see hardening, cracking, or leakage, because nitrile degrades faster when run continuously near the 10 psi or 2,400 RPM ratings.

What is the first limit reached if the shaft runs continuously at 2,400 RPM with mineral oil?

The 9.55 mps maximum surface speed is reached at the 3 in inside diameter, so sustained operation at 2,400 RPM hits the speed limit before the 10 psi pressure ceiling becomes critical.

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