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Transparent rubber shaft seal with metal spring visible inside circular profile

SKF

SKF 12631 Shaft Seal 1.25 x 2.441 x .25 in CRW1 NBR

SKU CH-E10H-2CT6Y

Rotary shaft seal with nitrile rubber lip, 1.25 in inside diameter, 2.441 in outside diameter, 0.25 in width, rated to 10 psi and 3,600 RPM

  • ColorTransparent
  • NBR lip resists oil, fuel and grease
  • CRW1 design seals at 10 psi max pressure
  • Carbon-steel spring maintains lip force up to 3,600 RPM
  • Acrylic-coated case protects against corrosion
  • Fits 1.25 in shaft with 2.441 in bore

Product identity

The SKF 12631 is a rotary shaft seal built to the CRW1 design code. It suits mechanics and equipment operators who need a reliable lip seal for rotating shafts in automotive or industrial machinery.

Build integration

The seal fits a 1.25 in shaft inside a 2.441 in bore with a .25 in overall width. Its carbon-steel garter spring maintains lip contact up to 3,600 RPM and 6 m/s surface speed while the acrylic-coated case resists installation damage.

Accessory impact

The single nitrile-rubber lip handles animal and vegetable oils, diesel, gasoline, greases, hot water, light heating oil and mineral oils at pressures up to 10 psi. No additional installation tools or software are supplied with the seal.

Highlights

  • NBR lip resists oil, fuel and grease
  • CRW1 design seals at 10 psi max pressure
  • Carbon-steel spring maintains lip force up to 3,600 RPM
  • Acrylic-coated case protects against corrosion
  • Fits 1.25 in shaft with 2.441 in bore

Specifications

BrandSKF
ColorTransparent

Questions about this item

How long will the 10 psi pressure rating hold before the seal weeps under continuous operation?

The seal is rated for a maximum pressure of 10 psi; exceeding this limit can cause premature lip wear and leakage.

Does the carbon-steel spring and nitrile lip generate noticeable heat at 3,600 RPM?

At the maximum rotational speed of 3,600 RPM the lip material runs within its design envelope, so heat build-up stays minimal.

Which shaft diameter and housing bore does the 1.25 in × 2.441 in seal fit?

It fits a 1.25 in shaft and a 2.441 in housing bore with a 0.25 in overall width.

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