This spring loaded, double-lip shaft seal has a steel case, a Buna-N sealing lip and dust lip, and is used for sealing moving shafts and rods in hydraulic and pneumatic systems. The case is made of steel to protect the lips and provide a surface for press-fitting into the housing, and the lips are made of Buna-N (also called nitrile rubber) with a durometer hardness rating of 90A for resistance to wear, abrasion, oil, and hydraulic fluids. This shaft seal has a helically coiled garter spring to help maintain contact between the sealing lip and the surface of the shaft. It has a temperature range of -40 to 230 degrees F, making it applicable for use in low-temperature hydraulic and pneumatic cylinders.
Radial shaft seals help retain lubricants and other fluids in hydraulic and pneumatic systems by sealing a rotating, oscillating, or reciprocating shaft or rod against its housing. They have a flexible lip (made of an elastomer such as nitrile or polyurethane) that comes into contact with the surface of the shaft to form a dynamic seal. Shaft seals generally have a steel outer case where the lip is bonded, and the outside diameter of the case is slightly larger than the bore of the housing to achieve a tight, press-fit seal. Double-lip seals, which have a second sealing lip, are typically used to separate two different system fluids. Radial shaft seals are used in various aircraft, automobiles, construction equipment, and foundry machines, among others.