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Transparent nitrile shaft seal with metal spring, 2.25 x 3.251 x .375 in

SKF

SKF 22440 Shaft Seal 2.25 x 3.251 x .375 in CRW1 Nitrile

SKU CH-BY5F-15FVX

Rotary shaft seal with 2.25 in inside diameter, 3.251 in outside diameter and .375 in width handles 10 psi and 820 RPM

  • ColorTransparent
  • Width3/8"
  • Reliable sealing up to 10 psi with nitrile rubber lip
  • Handles shaft speeds to 820 RPM and 8.38 m/s surface speed
  • Fits 2.25 in shaft and 3.251 in bore with .375 in width
  • Single-lip CRW1 design with carbon-steel spring for consistent contact
  • Compatible with oils, fuels, greases and hot water per spec

SKF 22440 Shaft Seal Application

The SKF 22440 is a rotary shaft seal designed for retaining lubricants and excluding contaminants in rotating equipment. It suits maintenance technicians and engineers working with shafts measuring 2.25 in diameter where a CRW1 design is specified.

Installation Practicalities

The seal installs by pressing the acrylic-coated case into a matching bore until fully seated. Care is needed to avoid damaging the single nitrile lip or dislodging the carbon-steel garter spring during insertion. Using a proper driver prevents cocking, which is the most common cause of early leakage.

Operational Limits

This seal handles a maximum pressure of 10 psi and a top rotational speed of 820 rpm, yielding a surface speed limit of 8.38 mps. It is rated for animal and vegetable oils, diesel, gasoline, greases, hot water, light heating oil and mineral oils. It is not suited for higher-pressure systems or speeds exceeding the stated limits.

Highlights

  • Reliable sealing up to 10 psi with nitrile rubber lip
  • Handles shaft speeds to 820 RPM and 8.38 m/s surface speed
  • Fits 2.25 in shaft and 3.251 in bore with .375 in width
  • Single-lip CRW1 design with carbon-steel spring for consistent contact
  • Compatible with oils, fuels, greases and hot water per spec

Specifications

BrandSKF
ColorTransparent
Width3/8"

Questions about this item

How can I confirm the seal is seated correctly after installation?

After installation, verify the seal sits flush in the bore with the spring side facing the fluid and check for no visible gaps; a short test run at up to 2,820 RPM should show no leakage at the 10 psi limit.

What comes in the package and what extra items might I need?

The box contains the single SKF 22440 nitrile shaft seal; you may need a seal driver or sleeve matching the 2.25 in inside diameter and a compatible lubricant for the 0.375 in width lip.

Which size should I select for my application?

Choose the 22440 part when your shaft measures 2.25 in, the housing bore is 3.251 in, and the available groove width is 0.375 in; the CRW1 design and nitrile lip suit the listed fluids and speeds.

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