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  • 12x19x5mm Nitrile Rubber Rotary Shaft Oil Seal R21 / SC
  • 12x19x5mm Nitrile Rubber Rotary Shaft Oil Seal R21 / SC
  • 12x19x5mm Nitrile Rubber Rotary Shaft Oil Seal R21 / SC
12x19x5mm Nitrile Rubber Rotary Shaft Oil Seal R21 / SC
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Oil Seals: Designed to aid trouble-free operation of your equipment, providing an excellent barrier against the escape of oils and greases and preventing the ingress of foreign matter.
Benefits: Excellent wear resistance, good running properties, high resistance to chemicals and petroleum based fuels including petrol, diesel and LPG.

Brand / Quality: Simply NBR Seals - High Quality
Inside Diameter: 12mm
Outside Diameter: 19mm
Width: 5mm
Shaft Size not Inside Diameter (d)
Outside Diameter (D)
Width (b)
Oil Seals
An oil seal normally consists of three basic components: The Sealing Element (the nitrile 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. Nitrile Rubber (NBR)
NBR is the most commonly used seal material. It has good heat resistance properties, good resistance to oils, salt solutions, hydraulic oils, and gasoline. Operation temperatures are recommended from -40deg C to 120deg C. It also functions well under dry environment, but only for intermittent periods.
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

Viton Chemical Resistance

  • William Quinn, United Kingdom 25/09/2019

    5 of 5 Stars!
    I bought these oil seals from you the other day and I was very impressed with every aspect of of the service you offer. Price, quality and quick delivery were all absolutely spot on. Thanks Simply I will certainly recommend you to my colleagues.

  • Braeden Brent, United Kingdom 03/09/2019

    5 of 5 Stars!
    Seal fits perfectly thanks for your advice very much appreciated. Thank You

  • Matthew Armstrong, United kingdom 02/10/2017

    5 of 5 Stars!

    Seals are absolutely fine, fixed a leak anyway! Will gladly buy from you again.

  • Jackson Josh, United Kingdom 27/10/2015

    5 of 5 Stars!
    Excellent product from a great company! Will use them again!

  • Billy Tristan, United Kingdom 10/09/2015

    5 of 5 Stars!
    Quality seal delivered quicky, just what I was after. Thank you.

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12x19x5mm Nitrile Rubber Rotary Shaft Oil Seal R21 / SC

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Simply bearings are the UK's largest online retailer of bearings, seals, belts, chains, sprockets, lubricants and other associated power transmission equipment.
Simply Bearings Ltd, Halton House, Greenfold Way, Leigh
Greater Manchester
United kingdom

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