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Small transparent rubber shaft seal with metal spring visible inside, SKF 7443 marking on side

SKF

SKF 7443 Shaft Seal 0.75 x 1.25 x 0.25 in CRWA1 Nitrile

SKU CH-CXAN-4Q3AK

Rotary shaft seal with 0.75 in bore, 1.25 in outside diameter and 0.25 in width in nitrile rubber

  • ColorTransparent
  • CRWA1 design with double lips seals rotary shafts up to 3,960 RPM
  • Nitrile rubber lip resists oil, fuel, grease and hot water in service
  • Acrylic-coated case installs easily and protects housing bore from corrosion
  • Carbon-steel garter spring maintains lip contact at 10 psi max pressure
  • ¾ in ID × 1¼ in OD × ¼ in width fits standard inch-dimension housings

Application and fit

This SKF 7443 rotary shaft seal fits a 0.75 in shaft and a 1.25 in bore with a 0.25 in overall width. It is built for mechanics and maintenance teams who need a direct replacement in inch-dimensioned equipment.

Upgrade considerations

The CRWA1 design adds a second lip and a carbon-steel spring over single-lip seals, giving better retention in gasoline, diesel, mineral oils, greases and hot water. The jump is worth it when the original seal leaks at low pressure or when the shaft runs up to 3,960 rpm.

Sustained operation

Nitrile lips and an acrylic-coated case handle continuous speeds of 3.93 mps while staying within the 10 psi pressure limit. The dual-lip arrangement keeps lubricant in and contaminants out during extended duty cycles.

Highlights

  • CRWA1 design with double lips seals rotary shafts up to 3,960 RPM
  • Nitrile rubber lip resists oil, fuel, grease and hot water in service
  • Acrylic-coated case installs easily and protects housing bore from corrosion
  • Carbon-steel garter spring maintains lip contact at 10 psi max pressure
  • ¾ in ID × 1¼ in OD × ¼ in width fits standard inch-dimension housings

Specifications

BrandSKF
ColorTransparent

Questions about this item

What bore and shaft dimensions does the 7443 seal fit?

The seal fits a 0.75 in shaft and a 1.25 in bore with a 0.25 in width.

How is the CRWA1 seal installed and what step is often missed?

Press the seal squarely into the bore until flush; the step often missed is pre-lubricating the nitrile lips with clean oil before installation.

When should the nitrile lip seal be replaced?

Replace the seal if leakage appears, the lips harden or crack, or after the shaft exceeds 3,960 RPM or 3.93 mps surface speed limits.

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