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Transparent nitrile rubber shaft seal with metal spring, 3.375 x 4.376 x .375 in

SKF

SKF 33701 Shaft Seal 3.375 x 4.376 x .375 in

SKU CH-9DV2-DYZSK

Rotary shaft seal with 3.375 in inside diameter, 4.376 in outside diameter and .375 in width for oils, greases and fuels up to 2,220 RPM

  • ColorTransparent
  • Width3/8"
  • Precise fit for 3.375 in shafts
  • Nitrile rubber lips resist oil and fuel
  • Carbon steel spring maintains constant sealing pressure
  • CRWA1 design handles up to 220 RPM
  • Acrylic-coated case simplifies installation

Product Identity

The SKF 33701 is a rotary shaft seal built to CRWA1 design code for sealing rotating shafts in automotive and industrial engines. It suits mechanics and engineers who need a reliable lip seal for oil, fuel, water or grease containment.

Build Integration

The seal presses into a 4.376 in bore and fits a 3.375 in shaft with a .375 in width, requiring no special tools beyond standard installation practice. Its acrylic-coated case resists corrosion while the carbon-steel garter spring maintains lip tension, freeing the builder from frequent re-adjustment.

Upgrade Context

This unit replaces worn or leaking single-lip seals where the dual nitrile lips and 10 psi pressure rating deliver longer service life. The jump is worth it when the application sees up to 2,220 rpm and surface speeds of 10.02 m/s in compatible fluids such as mineral oils, diesel or gasoline.

Highlights

  • Precise fit for 3.375 in shafts
  • Nitrile rubber lips resist oil and fuel
  • Carbon steel spring maintains constant sealing pressure
  • CRWA1 design handles up to 220 RPM
  • Acrylic-coated case simplifies installation

Specifications

BrandSKF
ColorTransparent
Width3/8"

Questions about this item

How long will the seal last when run continuously at the 220 RPM limit?

The seal is rated for a maximum rotational speed of 220 RPM and a surface speed of 10.02 mps; continuous operation at those limits will generate heat and wear that reduce service life, so plan for regular inspection.

How much heat and friction noise should I expect at the 10.02 mps surface speed?

At the maximum 10.02 mps surface speed the nitrile lips produce measurable friction heat and a low whine; adequate lubrication and shaft finish are essential to keep temperature and noise in check.

What shaft diameter and bore finish do I need for the 3.375 in ID and 4.376 in OD to seal properly?

The seal requires a shaft of 3.375 in diameter with a suitable surface finish and a housing bore of 4.376 in; the acrylic-coated case presses into the bore while the dual nitrile lips ride on the shaft.

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