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Small circular shaft seal with dark flexible lip and metal spring visible inside transparent case

SKF

SKF 29951 Rotary Shaft Seal 3 x 4 x 7/16 in CRWH1 Nitrile Rubber

SKU CH-F8MW-QC3MB

Rotary shaft seal with 3 in inside diameter, 4.003 in outside diameter, 0.438 in width and single nitrile rubber lip rated to 10 psi and 2,400 RPM

  • ColorTransparent
  • Width7/16"
  • Reliable sealing for oils and fuels
  • Nitrile rubber lip resists petroleum fluids
  • 10 psi pressure rating suits low-pressure systems
  • 2,400 RPM max speed handles moderate rotation
  • Acrylic-coated case protects against corrosion

Shaft seal for 3 in shafts

The SKF 29951 rotary shaft seal fits a 3 in inside diameter and a 4.003 in outside diameter with a 0.438 in overall width. Its CRWH1 design uses a single nitrile rubber lip and a carbon steel spring to retain lubricant and exclude contaminants on rotating shafts.

Acrylic coated case and 10 psi limit

The case carries an acrylic coating that helps resist corrosion during installation and service. Rated for a maximum pressure of 10 psi and a top rotational speed of 2,400 RPM, the seal suits splash-lubricated housings rather than pressurised systems.

Replaces worn single lip seals in oil or grease

This unit upgrades a leaking or hardened single lip seal in equipment handling mineral oils, greases, gasoline, diesel, animal or vegetable oils and hot water. The jump is worth it when the old lip no longer holds a film at 9.55 mps surface speed or when the case coating has failed.

Highlights

  • Reliable sealing for oils and fuels
  • Nitrile rubber lip resists petroleum fluids
  • 10 psi pressure rating suits low-pressure systems
  • 2,400 RPM max speed handles moderate rotation
  • Acrylic-coated case protects against corrosion

Specifications

BrandSKF
ColorTransparent
Width7/16"

Questions about this item

What fluids is the CRWH1 nitrile rubber lip rated to seal?

The seal handles animal and vegetable oils, diesel, gasoline, greases, hot water, light heating oil and mineral oils.

What shaft and bore dimensions does the 29951 seal fit?

It installs on a 3 in shaft into a 4.003 in bore with a .438 in overall width.

How is the seal oriented during installation and what is the common mistake?

Press the metal case squarely into the bore with the spring-loaded lip facing the fluid side; reversing the lip direction is the frequent error.

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