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Transparent nitrile shaft seal with carbon steel spring, 1.25 in ID x 1.983 in OD x .25 in width

SKF

SKF 12428 Shaft Seal 1.25 in x 1.983 in x .25 in CRWA1 Nitrile

SKU CH-AC4C-E2VM7

Rotary shaft seal handles 3,600 RPM with dual nitrile lips for oils and fuels

  • ColorTransparent
  • SKF quality seal prevents leaks with nitrile rubber lips
  • 25 in shaft fit matches standard inch dimensions
  • Dual-lip design handles 10 psi pressure for reliable sealing
  • CRWA1 construction rated to 3,600 RPM for rotary use
  • Compatible with oils, fuels, greases and hot water

Product Identity

The SKF 12428 is a rotary shaft seal designed for industrial and automotive sealing tasks. It suits maintenance engineers and mechanics who need a reliable lip seal for rotating equipment.

Build and Mounting

A CRWA1 design code defines the case and lip geometry, while an acrylic case coating aids installation. The carbon steel spring maintains lip tension, and the nitrile rubber lips handle animal and vegetable oils, diesel, gasoline, greases, hot water, light heating oil and mineral oils.

Operational Limits

Maximum pressure is rated at 10 psi, and the seal accepts speeds up to 3, 600 RPM with a surface speed limit of 6 mps. It is not intended for high-pressure hydraulic systems or applications exceeding these rotational and surface velocity thresholds.

Highlights

  • SKF quality seal prevents leaks with nitrile rubber lips
  • 25 in shaft fit matches standard inch dimensions
  • Dual-lip design handles 10 psi pressure for reliable sealing
  • CRWA1 construction rated to 3,600 RPM for rotary use
  • Compatible with oils, fuels, greases and hot water

Specifications

BrandSKF
ColorTransparent

Questions about this item

What does the CRWA1 design code mean for the 1.25 in shaft seal?

The CRWA1 code identifies a rotary shaft seal with two nitrile rubber lips, a carbon steel spring and an acrylic-coated case, rated for 10 psi maximum pressure and 3,600 RPM.

What bore and shaft dimensions does the 1.983 in outside diameter seal require?

The seal fits a 1.983 in housing bore and a 1.25 in shaft, with an overall width of 0.25 in once seated.

How is the SKF 12428 seal installed and which step is commonly missed?

Press the seal squarely into the bore until flush, lubricating the lips with compatible oil; the step often missed is verifying the spring stays seated behind the primary lip.

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