10121VSC Type SC FKM Oil Seal

1.000" Shaft OD X 1.25" Bore ID X 0.125" H Type SC Oil Seal

FKM or FKM Rubber Single Lip R21 / SC Oil Seals

An oil seal normally consists of three basic components: The Sealing Element (the FKM rubber part), the Metal Case, and the Spring. It is a widely used sealing component. The function of a seal is to prevent the leakage of medium along the moving parts. This is mainly achieved by the sealing element. FKM / FKM

FKM® is the trade name for DuPont-Dow Elastomers Fluorocarbon or FKM material. FKM provides excellent resistance to a wide variety of chemicals, weather and compression set requirements. The relatively high level of fluorine in FKM® materials allows for exceptional resistance to chemical attack, but with limited low temperature capabilities. Intermittent exposure to +600F can be tolerated for brief periods of time. Many industrial products are now switching to Orings made of FKM®, making it the most significant elastomer development in 50 years.

Operating temperature: -20° to +400F°

R21 / SC design cross section

Cross section of an R21 / SC style oil seal.

This is a single sealing lip seal arrangement.

The seal cases are made from SAE 1008-1010 Carbon Steel and are often coated in a very thin layer of Nitrile rubber to assist sealing in the housing.
The principle function of the metal case is to impart rigidity and strength to the seal.
The spring is made from SAE 1050-1095 Carbon Spring Steel which has a protective zinc coating.
The principle function of the spring is to maintain an even gripping pressure around the shaft
Select your Shaft OD from below and purchase your oil seal online.


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  • Model: 10121VSC
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