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  • 17x30x5mm Nitrile Rubber Rotary Shaft Oil Seal R21 / SC
  • 17x30x5mm Nitrile Rubber Rotary Shaft Oil Seal R21 / SC
17x30x5mm 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: 17mm
Outside Diameter: 30mm
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

  • Liam Thames, United kingdom 18/12/2019

    5 of 5 Stars!
    Great value oil seals and top quality. The service was spot on and free delivery as well. That’s why I will be using you again.

  • Agustin Summers, United Kingdom 25/09/2019

    5 of 5 Stars!
    Wonderful service, terrific oil seals!

  • Sam Broderick, United Kingdom 19/08/2015

    5 of 5 Stars!
    Quality seal delivered fast. Will be sure to recommend your store to all. Thank you.

  • Atticus Justin, United Kingdom 17/08/2015

    5 of 5 Stars!
    Quality seal delivered quickly. Just the job Thank you!

  • Dominique Whittle, United Kingdom 26/06/2015

    5 of 5 Stars!
    Thank you for delivering this seal quickly. Ordered this yesterday on a free delivery and received it in the post this morning. Will be back to order from you again soon and will be sure to recommend you to friends and family.

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17x30x5mm 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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