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Transparent rubber shaft seal with metal spring visible inside the lip

SKF

SKF 14939 Shaft Seal 1.5 x 2.25 x .313 in CRWA1 NBR

SKU CH-K20T-1FJH4

Rotary shaft seal with 1.5 in ID, 2.25 in OD and .313 in width handles oils, greases and fuels up to 3,360 RPM

  • Product colorTransparent
  • Reliable sealing for common fluids with NBR lip material
  • Fits standard shaft sizes using 1.5 in ID and 2.25 in OD
  • Low-pressure systems supported up to 10 psi maximum
  • High-speed operation rated for 3,360 RPM rotational speed
  • Durable construction with carbon steel spring and acrylic-coated case

Shaft seal for rotating assemblies

This SKF rotary shaft seal suits equipment with a 1.5 inch shaft running in a 2.25 inch bore. The CRWA1 design uses twin nitrile lips and a carbon-steel spring to retain lubricants and exclude contaminants in automotive and industrial drivelines.

Thermals noise and power draw in normal use

The nitrile rubber lips handle continuous surface speeds up to 6.74 mps and rotational speeds to 3,360 RPM. Pressure capability is limited to 10 psi, so the seal runs cool with minimal drag in typical splash-lubricated housings.

Upgrade path from worn single-lip seals

Replaces hardened or leaking single-lip units where the bore and shaft dimensions match. The dual-lip CRWA1 design adds a dust lip for longer life in dirty environments, making the swap worthwhile when the original seal fails prematurely.

How it compares

Measured against everything we stock in Engine Service & Diagnostic Tools, at today’s prices. Recalculated every night.

Price $6.99
Cheaper than about 94% of the 1,113 comparable items (median $19.99).

Specifications

Product
Brand nameSKF
Product colorTransparent

Questions about this item

How do I press the SKF 14939 shaft seal into a 2.25 in bore without damaging the acrylic-coated case?

Use a flat installation sleeve that contacts only the outer case edge, tap evenly around the circumference, and stop when the seal face sits flush with the housing shoulder; the acrylic coating protects against corrosion but will peel if a drift punch hits it directly.

When should I replace the nitrile rubber lips on this 1.5 in ID seal?

Plan replacement at the first sign of lip hardening, cracking, or leakage — nitrile degrades faster with sustained temperatures near its limit or continuous exposure to diesel and hot water, so inspect during every scheduled oil change.

At what shaft speed does the 10 psi pressure limit become the limiting factor for this CRWA1 seal?

The 10 psi maximum pressure is the first constraint reached under sustained operation; even at the rated 3,360 RPM and 6.74 m/s surface speed, exceeding 10 psi will cause lip blow-by before heat or wear becomes critical.

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