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  • 8x28x5mm Nitrile Rubber Rotary Shaft Oil Seal R21 / SC
  • 8x28x5mm Nitrile Rubber Rotary Shaft Oil Seal R21 / SC
8x28x5mm 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: 8mm
Outside Diameter: 28mm
Width: 5mm
Shaft Size not Inside Diameter (d)
=
8mm
Outside Diameter (D)
=
28mm
Width (b)
=
5mm
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.

Construction
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

  • Jayvon Perry, United Kingdom 19/12/2019

    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.

  • Dereon Moss, United Kingdom 19/12/2019

    5 of 5 Stars!
    I called at your trade counter to source some replacement oil seals which were very badly damaged . Although they were extremely distorted the young lady was very methodical and thorough in identifying the correct replacements but above all she was polite and patient. A very good experience indeed.

  • Corey Malcolm, United Kingdom 17/12/2019

    5 of 5 Stars!
    Fast delivery of my oil seals.

  • Martin Howard, United Kingdom 17/12/2019

    5 of 5 Stars!
    Came to your trade counter for replacement oil seals, the man serving me was very friendly and served me very quickly

  • Conor Randy, United Kingdom 17/12/2019

    5 of 5 Stars!
    Came to your trade counter for replacement oil seals, the man serving me was very friendly and served me very quickly

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8x28x5mm Nitrile Rubber Rotary Shaft Oil Seal R21 / SC
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Brands

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
WN7 3XJ
United kingdom

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