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  • 10x18x5mm Nitrile Rubber Rotary Shaft Oil Seal R21 / SC
  • 10x18x5mm Nitrile Rubber Rotary Shaft Oil Seal R21 / SC
10x18x5mm 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: 10mm
Outside Diameter: 18mm
Width: 5mm
Shaft Size not Inside Diameter (d)
=
10mm
Outside Diameter (D)
=
18mm
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

  • Landen Atkins, United Kingdom 18/12/2019

    5 of 5 Stars!
    Been looking for these oil seals for a long time, wish I had found your service sooner, excellent service

  • Ricky Silva, United Kingdom 25/09/2019

    5 of 5 Stars!
    Amazing oil seals, top quality!

  • Ben Levine, United Kingdom 01/09/2015

    5 of 5 Stars!
    Quality seal delivered quickly. Just what I was after thank you.

  • Paul Morris, United kingdom 29/05/2015

    5 of 5 Stars!
    The item was exactly as advertised, is fitted and working. Speed of delivery was excellent.

  • Deegan Greyson, United Kingdom 26/03/2015

    5 of 5 Stars!
    I ordered my oil seal and was very impressed with how easy it was to use your website. The quality and price were great and the service was excellent.

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10x18x5mm 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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