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SKF 21100 rotary shaft seal CRWA1 transparent nitrile rubber lip carbon steel spring acrylic coated case 2.125 inch inside diameter

SKF

SKF 21100 Rotary Shaft Seal CRWA1 NBR 2.125x2.875x.438

SKU CH-7XXW-RKWRE

Seals rotating shafts up to 2,880 RPM with dual nitrile lips rated for 10 psi and 8.15 mps surface speed

  • ColorTransparent
  • Width7/16"
  • Seals rotary shafts up to 2,880 RPM
  • NBR lip resists oils, fuels, greases and hot water
  • Spring-loaded double lip maintains contact at 10 psi max
  • Inch-dimension 2.125 in ID × 2.875 in OD fits standard housings
  • Acrylic-coated case eases installation and protects bore

SKF 21100 Rotary Shaft Seal CRWA1

This SKF 21100 rotary shaft seal suits engines and gearboxes that require a 2.125 in bore and 2.875 in housing diameter. It is built for mechanics and maintenance teams who need a reliable lip seal for rotating shafts in industrial or automotive equipment.

Dual-lip nitrile rubber with carbon-steel spring

The decisive specification is the CRWA1 design with two NBR lips and a carbon-steel garter spring that maintains contact pressure on the shaft. This combination handles mineral oils, diesel, gasoline, greases, hot water, light heating oil and animal or vegetable oils at pressures up to 10 psi.

Rated for 880 RPM and 8.15 m/s surface speed

Under sustained rotation the seal operates continuously at up to 880 RPM with a maximum surface speed of 8.15 m/s. The acrylic-coated case and 0.438 in width provide stable retention in the housing during extended duty cycles.

Highlights

  • Seals rotary shafts up to 2,880 RPM
  • NBR lip resists oils, fuels, greases and hot water
  • Spring-loaded double lip maintains contact at 10 psi max
  • Inch-dimension 2.125 in ID × 2.875 in OD fits standard housings
  • Acrylic-coated case eases installation and protects bore

Specifications

BrandSKF
ColorTransparent
Width7/16"

Questions about this item

What does the 2.125 in inside diameter mean when the seal is installed on a shaft?

The 2.125 in inside diameter matches a shaft of that exact size so the two sealing lips contact the surface and hold fluid up to 10 psi at speeds up to 2,880 RPM.

How does the CRWA1 design code limit pressure and speed in service?

The CRWA1 design with nitrile lips, carbon-steel spring and acrylic-coated case is rated for 10 psi maximum pressure and 2,880 RPM or 8.15 m/s surface speed.

What bore and shaft dimensions are required for this 2.875 x 2.125 x .438 in seal?

The seal needs a 2.875 in housing bore, a 2.125 in shaft and .438 in axial space; the case coating helps it seat in steel or cast-iron bores.

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