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Transparent rubber shaft seal with metal spring, SKF 13671

SKF

SKF 13671 Shaft Seal 1.375 x 2.25 x .313 in CRW1 NBR

SKU CH-SXMA-R0D2S

Rotary shaft seal with 1.375 in inside diameter, 2.25 in outside diameter, .313 in width, CRW1 design, nitrile rubber lip and carbon steel spring for oil and grease retention up to 3,480 RPM

  • ColorTransparent
  • Reliable sealing for shafts up to 3,480 RPM
  • Nitrile rubber lip resists oils, greases and fuels
  • Acrylic-coated case protects against corrosion
  • CRW1 design with carbon-steel spring maintains contact pressure
  • Precise 1.375 in ID × 2.25 in OD × .313 in width fits specified housings

Application Fit

The SKF 13671 rotary shaft seal suits engines and gearboxes that require a 1.375 in bore, 2.25 in housing and 0.313 in width. It is not for applications needing higher pressure capability, larger diameters or dual-lip designs.

Interface Limits

The CRW1 design handles up to 10 psi and 3,480 RPM with a maximum surface speed of 6.38 mps. Nitrile rubber lips resist animal and vegetable oils, diesel, gasoline, greases, hot water, light heating oil and mineral oils. Exceeding the pressure or speed ratings will cause premature leakage.

Installation Notes

Press the seal squarely into the housing using a suitable driver that contacts the outer case only. The acrylic coating assists initial seating but offers no corrosion protection once installed. Damage to the single lip or carbon-steel spring during fitting is the most common cause of early failure.

Highlights

  • Reliable sealing for shafts up to 3,480 RPM
  • Nitrile rubber lip resists oils, greases and fuels
  • Acrylic-coated case protects against corrosion
  • CRW1 design with carbon-steel spring maintains contact pressure
  • Precise 1.375 in ID × 2.25 in OD × .313 in width fits specified housings

Specifications

BrandSKF
ColorTransparent

Questions about this item

Should I choose this 1.375 in bore seal or a different size?

Select this 13671 seal only when the shaft measures 1.375 in, the housing bore is 2.25 in and the groove depth matches the .313 in width; any other dimension requires a different part number.

What does the 3,480 RPM rating mean once the seal is installed?

It indicates the maximum shaft speed the NBR lip can sustain without overheating; running faster than 3,480 RPM risks premature wear and leakage.

How does the CRW1 design code limit the seal in practice?

CRW1 denotes a single-lip, spring-loaded nitrile seal rated to 10 psi and 6.38 m/s surface speed, so it suits low-pressure rotary applications with compatible fluids.

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