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Transparent rubber rotary shaft seal with metal spring and acrylic-coated case

SKF

SKF 11777 rotary shaft seal 1-13/64 x 1-63/64 x 1/4 in CRWA1

SKU CH-R738-142H8

Rotary shaft seal with 1.188 in inside diameter, 1.983 in outside diameter and 0.25 in width handles oil, fuel, grease and water up to 3,660 RPM

  • ColorTransparent
  • Seals at 5.79 m/s surface speed
  • Handles 3,660 RPM rotational limit
  • Nitrile lip resists oils, fuels and water
  • Dual-lip design with carbon-steel spring
  • Acrylic-coated case for corrosion resistance

Engine Tools Shaft Seal

The SKF 11777 is a CRWA1 rotary shaft seal built for engines and rotating equipment. It fits shafts with a 1.188 in inside diameter and a 1.983 in housing bore. The nitrile rubber lip handles animal and vegetable oils, diesel, gasoline, greases, hot water, light heating oil and mineral oils. Mechanics and technicians use it to stop leaks at the shaft exit.

Shaft And Housing Check

Confirm the shaft measures 1.188 in and the bore measures 1.983 in before ordering. The seal width is 0.25 in, so the groove must accept that depth. Verify the application runs at or below 3, 660 RPM and 5.79 mps surface speed. Ensure the fluid type matches the listed compatibility range.

Double Lip Upgrade

This seal replaces single lip or worn CRWA1 units where extra sealing security is needed. The second lip and carbon steel spring improve retention under 10 psi pressure. The jump is worth it when the original seal leaks early or the fluid is abrasive. Acrylic case coating eases installation in steel or aluminium housings.

Highlights

  • Seals at 5.79 m/s surface speed
  • Handles 3,660 RPM rotational limit
  • Nitrile lip resists oils, fuels and water
  • Dual-lip design with carbon-steel spring
  • Acrylic-coated case for corrosion resistance

Specifications

BrandSKF
ColorTransparent

Questions about this item

Does the SKF 11777 rotary shaft seal ship alone or with installation hardware?

The box contains the single CRWA1 seal with nitrile rubber lips and carbon steel spring. No installation tools, lubricants or additional components are included.

How do I choose between the listed dimensions for this seal?

Select the seal that matches a 1.188 in shaft diameter and a 1.983 in bore diameter with a 0.25 in overall width. The CRWA1 design code and inch measurement system are fixed for this part number.

What does the 3,660 RPM rating mean once the seal is installed on a shaft?

It is the maximum rotational speed the two-lip nitrile seal can sustain at 10 psi pressure while maintaining contact on a 1.188 in shaft, corresponding to a surface speed of 5.79 m/s.

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