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  • 17x28x7mm Nitrile Rubber Rotary Shaft Oil Seal with Garter Spring R21 / SC
  • 17x28x7mm Nitrile Rubber Rotary Shaft Oil Seal with Garter Spring R21 / SC
17x28x7mm Nitrile Rubber Rotary Shaft Oil Seal with Garter Spring R21 / SC
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17x28x7mm Nitrile Rubber Rotary Shaft Oil Seal with Garter Spring 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: 28mm
Width: 7mm
Shaft Size not Inside Diameter (d)
=
17mm
Outside Diameter (D)
=
28mm
Width (b)
=
7mm
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

  • Jeremiah Ernest, United Kingdom 19/12/2019

    5 of 5 Stars!
    With the great pictures on the website it instilled confidence in my purchase of oil seals.

  • Dalton Albert, United Kingdom 19/12/2019

    4 of 5 Stars!
    Great quality, good value for money and super service. I will buy all my oil seals from you in future.

  • Henry Eccles, Uk 18/12/2019

    5 of 5 Stars!
    Thanks for delivering my oil seals the next day

  • Tucker Jordan, United Kingdom 25/09/2019

    4 of 5 Stars!
    Very easy to use website unlike some others I've used, Found the oil seals I needed with no trouble at all. Delivered next day even though I'd only opted for free post. Great stuff.

  • Ronnie Hinton, United Kingdom 17/11/2017

    5 of 5 Stars!
    Securely packaged along with the rest of my order, plus it arrived the following day and I wasn't even charged for delivery

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17x28x7mm Nitrile Rubber Rotary Shaft Oil Seal with Garter Spring 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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