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SKF 37525 rotary shaft seal, transparent nitrile rubber ring with carbon steel spring, 3.75 in ID, 4.999 in OD, .375 in width

SKF

SKF 37525 Rotary Shaft Seal 3.75 in ID 4.999 in OD .375 in Width CRW1 NBR

SKU CH-92H1-ESNNB

Rotary shaft seal with 3.75 in inside diameter, 4.999 in outside diameter and .375 in width for oil and grease retention

  • ColorTransparent
  • Width3/8"
  • Precise fit for 3.75 in shafts
  • Nitrile rubber handles oils and fuels
  • Single lip seals at 10 psi max
  • Carbon steel spring maintains lip pressure
  • Rated to 2 100 RPM and 10.45 mps

SKF 37525 Rotary Shaft Seal

The SKF 37525 is a rotary shaft seal designed for sealing rotating shafts in automotive and industrial equipment. It features a CRW1 design code with a single nitrile rubber lip and a carbon steel spring. This new component suits maintenance technicians and engineers replacing worn seals on shafts measuring 3.75 inches in diameter.

Sealing limits: 10 psi and 2,100 RPM

The seal handles a maximum pressure of 10 psi and a maximum rotational speed of 2,100 RPM. Its maximum surface speed is rated at 10.45 mps. The nitrile rubber lip material is compatible with mineral oils, gasoline, diesel, greases, animal and vegetable oils, light heating oil, and hot water. Exceeding these pressure or speed limits will cause premature failure.

Replaces worn CRW1 seals on 3.75 in shafts

This part directly replaces a failed CRW1-type seal with identical inside diameter, outside diameter, and width dimensions. The upgrade is worth it when the original seal leaks due to lip wear, spring fatigue, or chemical degradation from the listed fluids. It is not for applications requiring higher pressure ratings, higher shaft speeds, or multi-lip designs for heavy contamination exclusion.

Highlights

  • Precise fit for 3.75 in shafts
  • Nitrile rubber handles oils and fuels
  • Single lip seals at 10 psi max
  • Carbon steel spring maintains lip pressure
  • Rated to 2 100 RPM and 10.45 mps

Specifications

BrandSKF
ColorTransparent
Width3/8"

Questions about this item

Should I choose the 3.75 in ID or the 4.999 in OD version?

The seal has a single size: 3.75 in inside diameter, 4.999 in outside diameter and .375 in width. Both diameters are fixed for this part.

What does the 2,100 RPM rating mean once the seal is installed?

It is the maximum rotational speed the lip can handle without overheating; above that the nitrile rubber and carbon-steel spring degrade faster.

What does the CRW1 design code cap in practice?

CRW1 defines a single-lip, contact-type seal with an acrylic-coated case, limiting pressure to 10 psi and surface speed to 10.45 mps.

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