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SKF 7513 rotary shaft seal, translucent nitrile rubber with metal spring, 0.75 in ID 1.375 in OD

SKF

SKF 7513 Rotary Shaft Seal CRWA1 Nitrile 0.75 in ID 1.375 in OD

SKU CH-1D7H-MRSWD

Rotary shaft seal with dual nitrile lips and carbon-steel spring fits 0.75 in shafts, rated to 3,960 RPM and 10 psi

  • ColorTransparent
  • Reliable sealing up to 10 psi with nitrile rubber lips
  • Handles 3,960 RPM thanks to carbon-steel spring and dual-lip design
  • Fits 0.75 in shafts and 1.375 in bores precisely
  • Resists oils, fuels, grease and hot water for long service life
  • CRWA1 design with acrylic-coated case installs easily at 0.25 in width

Shaft seal for 0.75 in shafts

This SKF 7513 rotary shaft seal fits a 0.75 in inside diameter and a 1.375 in outside diameter. The nitrile rubber lips and carbon steel spring suit animal and vegetable oils, diesel, gasoline, greases, hot water, light heating oil and mineral oils. It is designed for inch-system equipment that requires a CRWA1 profile.

Sustained operation up to 3 960 RPM

The seal handles a maximum rotational speed of 3 960 RPM and a surface speed of 3.93 mps. Pressure capacity is limited to 10 psi, so it is intended for low-pressure lubrication or splash environments rather than pressurised systems. The dual-lip design with spring loading maintains contact under steady motion.

Press-fit into 1.375 in bore

Installation is a straight press into a 1.375 in housing bore with an overall width of 0.25 in. The acrylic-coated case helps prevent bore corrosion but offers no structural reinforcement. Misalignment or a rough bore finish will damage the nitrile lips quickly, and the 10 psi limit means the seal will extrude if system pressure spikes.

Highlights

  • Reliable sealing up to 10 psi with nitrile rubber lips
  • Handles 3,960 RPM thanks to carbon-steel spring and dual-lip design
  • Fits 0.75 in shafts and 1.375 in bores precisely
  • Resists oils, fuels, grease and hot water for long service life
  • CRWA1 design with acrylic-coated case installs easily at 0.25 in width

Specifications

BrandSKF
ColorTransparent

Questions about this item

How much heat does the nitrile lip generate when the shaft runs at 3,960 RPM all day?

At the rated 3.93 mps surface speed the two nitrile lips with carbon-steel spring produce only normal seal friction heat; no extra cooling is required.

What shaft diameter and housing bore must already exist for the 0.75 in ID and 1.375 in OD seal to fit?

The seal needs a 0.75 in shaft and a 1.375 in bore; the 0.25 in overall width sits in the existing gland.

Will the CRWA1 design seal against the same mineral oils and gasoline that my older engine uses?

Yes — the nitrile lips are rated for mineral oils, gasoline, diesel, greases, animal and vegetable oils, and hot water.

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