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SKF 13698 rotary shaft seal, transparent nitrile rubber, 1.375 in ID, 2.25 in OD, .25 in width

SKF

SKF 13698 Shaft Seal CRWA1 NBR 1.375 in ID 2.25 in OD 0.25 in Width

SKU CH-80Z0-S8K4F

Rotary shaft seal with 1.375 in ID, 2.25 in OD, 0.25 in width, NBR lips and carbon steel spring for up to 3,480 RPM

  • ColorTransparent
  • Width1/4"
  • Reliable sealing for rotary shafts with 1.375 in inside diameter
  • Durable nitrile rubber lips handle 10 psi maximum pressure
  • Carbon steel spring maintains lip contact up to 480 RPM
  • Compatible with oils, fuels, grease and hot water
  • Compact 0.25 in width fits tight engine spaces

Precision Engine Seal

The SKF 13698 is a CRWA1 rotary shaft seal built for automotive engine repair. Its nitrile rubber lips suit gasoline, diesel, mineral oils, greases and hot water. Mechanics and DIY technicians use it to replace worn crankshaft or gearbox seals on inch-dimensioned housings.

Thermal and Friction Behaviour

Rated for a maximum surface speed of 6.38 m/s and 3,480 RPM, the twin-lip design limits heat build-up at the contact face. Carbon steel spring tension keeps the lips seated without excessive drag. The 10 psi pressure ceiling means the seal stays cool and quiet in normal splash-lubricated engine cavities.

Critical Fit Dimension

The inside diameter is 1.375 in and the outside diameter is 2.25 in. If the shaft or bore differs from these figures the seal will leak or fail to seat. Verify both diameters on the component before ordering.

Highlights

  • Reliable sealing for rotary shafts with 1.375 in inside diameter
  • Durable nitrile rubber lips handle 10 psi maximum pressure
  • Carbon steel spring maintains lip contact up to 480 RPM
  • Compatible with oils, fuels, grease and hot water
  • Compact 0.25 in width fits tight engine spaces

Specifications

BrandSKF
ColorTransparent
Width1/4"

Questions about this item

How do I press the 1.375 in ID seal into a 2.25 in bore without damaging the acrylic-coated case?

Use a flat-faced driver that contacts only the outer metal case, press squarely until the case sits flush, and never strike the NBR lip or the carbon-steel spring directly.

When should I plan to replace the NBR lips on this CRWA1 seal?

Replace the seal if the two NBR lips show hardening, cracking, or if leakage appears, typically after extended exposure to temperatures near the material limit or abrasive contaminants in the fluid.

What is the first limit reached when the shaft runs continuously at 3,480 RPM?

The 6.38 m/s surface-speed rating is reached first; exceeding it raises lip temperature and accelerates NBR wear even though the 10 psi pressure limit is not exceeded.

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