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  • 16x22x4mm Nitrile Rubber Rotary Shaft Oil Seal R21 / SC
  • 16x22x4mm Nitrile Rubber Rotary Shaft Oil Seal R21 / SC
16x22x4mm 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: 16mm
Outside Diameter: 22mm
Width: 4mm
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

  • Nickolas Rohan, United Kingdom 17/01/2020

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

  • Toby Ernesto, United Kingdom 18/12/2019

    5 of 5 Stars!
    Initially, I thought I was going to struggle to find the correct oil seals however It easy.

  • Owen Hobbs, United Kingdom 04/07/2018

    5 of 5 Stars!
    As Described

  • Demetrius Gonzalez, United Kingdom 29/09/2015

    5 of 5 Stars!
    Very good quality seal! Easy to use website! Will use this company again!

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16x22x4mm 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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