SKF Nitrile Rubber (NBR) Radial Shaft Seal, 40 mm ID, 52 mm OD, 8 mm

This radial shaft seal provides a rotating-shaft sealing solution for machinery where fluid retention and contaminant exclusion are required. It is constructed from nitrile rubber to function in rotary sealing applications, fitting shafts with a 40 mm inner diameter and housing bores around a 52 mm outer diameter, and is intended for installations where an 8 mm-wide sealing element is appropriate.

• Nitrile rubber composition resists common oils and fuels
• Rotary lip design reduces leakage at shaft interfaces
• 8 mm thickness supports stable axial sealing force
• 40 mm inner diameter ensures accurate shaft fit
• 52 mm outside diameter maintains secure bore retention

• Suitable for sealing oil in gearbox assemblies
• Ideal for rotating pumps with shaft diameters of 40 mm
• Used with electric motor drives requiring oil retention
• Can be used for hydraulic component shaft sealing
• Suitable for replacement in metric machinery maintenance

The elastomer is nitrile rubber which offers resistance to many mineral oils and common hydraulic fluids while remaining flexible at moderate operating temperatures.

Alignment tools or a flat driver should be used to press the seal squarely into the bore to prevent lip distortion and ensure even seating.

Visible lip hardening, cracks in the elastomer, or persistent leakage at the shaft Interface indicate the seal should be replaced.

A smooth, scratch-free shaft with appropriate roundness minimises wear on the sealing lip and prolongs operational life.