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Small transparent rubber seal with black metal spring visible inside circular metal case

SKF

SKF 11372 Rotary Shaft Seal 1.125 x 2.125 x .313 in CRW1 NBR

SKU CH-31ZJ-3Z1KE

Rotary shaft seal with 1.125 in inside diameter, 2.125 in outside diameter and .313 in width, nitrile rubber lip rated for 10 psi and 3,720 RPM

  • ColorTransparent
  • Prevents fluid loss with 1.125 in inside diameter
  • Resists oil and fuel using nitrile rubber lip
  • Withstands 3,720 RPM maximum rotational speed
  • Handles 10 psi pressure with single-lip contact seal
  • Operates at 5.57 m/s surface speed with carbon steel spring

SKF 11372 Rotary Shaft Seal

The SKF 11372 is a CRW1-design rotary shaft seal built for 1.125 in inside diameter and 2.125 in outside diameter. Its nitrile rubber lip and carbon steel spring suit engines and gearboxes handling animal or vegetable oils, diesel, gasoline, greases, hot water, light heating oil and mineral oils.

Operating Limits

Maximum pressure is rated at 10 psi and maximum rotational speed at 3,720 RPM with a surface speed up to 5.57 mps. The single-lip contact seal and acrylic-coated case are intended for standard lubrication environments rather than high-pressure or extreme-speed applications.

Replacement Guidance

This seal directly replaces a worn CRW1 unit of the same 1.125 x 2.125 x .313 in dimensions. The upgrade is worthwhile when the old lip shows hardening, leakage at the rated 10 psi or groove wear that exceeds the single-lip sealing capability.

Highlights

  • Prevents fluid loss with 1.125 in inside diameter
  • Resists oil and fuel using nitrile rubber lip
  • Withstands 3,720 RPM maximum rotational speed
  • Handles 10 psi pressure with single-lip contact seal
  • Operates at 5.57 m/s surface speed with carbon steel spring

Specifications

BrandSKF
ColorTransparent

Questions about this item

Should I pick the 1.125 in ID or the 2.125 in OD version for my shaft?

The seal has a 1.125 in inside diameter and a 2.125 in outside diameter; choose the one that matches your shaft and housing dimensions.

What does the 3,720 RPM rating mean when the seal is installed?

It is the maximum rotational speed the lip can handle; exceeding it can cause overheating and premature wear.

How does the CRW1 design and NBR material limit pressure and fluid use?

The CRW1 single-lip nitrile seal is rated for 10 psi and suits oils, greases, diesel, gasoline, hot water and light heating oil.

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