Coronavirus - Covid-19 ~ What we are doing.
We are open. We are suppliers of essential parts to the NHS, Fire Services, Power generation sector and Food Manufacturing sectors.
We are open for web orders.
Phone lines are open normal working hours.
Phone lines are open normal working hours.
Please note: In line with the Prime Ministers' recent directive our trade counter is closed until further notice.
- Categories
- All Bearings
- Housings & Inserts
- Deep Groove Ball Bearings
- Needle Roller Bearings
- Cylindrical Roller Bearings
- Taper Roller Bearings
- Cam Roller Bearings
- Flanged Ball Bearings
- Cam Followers
- Spherical Plain Bearings
- Needle Roller Inner Races
- Linear Bearings
- Thrust Bearings
- Spherical Roller Bearings
- Angular Contact Bearings
- Double Row Ball Bearings
- Self Aligning Ball Bearings
- Lazy Suzan Bearings
- Magneto Bearings
- Rod End Bearings
- Agricultural Bearings
- Four Point Contact Bearings
- Automotive Products
- Bronze & Wrapped Bushes
- Show All Types
- Sealing Products
- Power Transmission
- Balls & Rollers
- Cycling Products
- Engineering Parts
- Pulleys
- Tapered Locking Bushes
- Couplings
- Speedi Sleeves
- External Circlips
- Internal Circlips
- E-Clips
- Round Wire Snap Rings
- Jubilee Clips
- Nilos Rings
- Spring Grip Clips
- Cotter Pins
- Sealing Washers
- Nuts
- Set Screws
- Shaft Collars
- Castor Wheels
- Ball Transfer Units & Clamp Rings
- Assorted Kits
- Cleaning Products
- Padlocks & Chains
- Grease Fittings
- Gloves
- Show All Types
- Tools
- Lubrication & Adhesives
- Garden Parts & Accessories
FREE UK Delivery
We Ship Worldwide
-
Or Search by sizes
- All
Bearings- Housings & Inserts
- Deep Groove Ball Bearings
- Needle Roller Bearings
- Cylindrical Roller Bearings
- Taper Roller Bearings
- Cam Roller Bearings
- Flanged Ball Bearings
- Cam Followers
- Spherical Plain Bearings
- Needle Roller Inner Races
- Linear Bearings
- Thrust Bearings
- Spherical Roller Bearings
- Angular Contact Bearings
- Double Row Ball Bearings
- Self Aligning Ball Bearings
- Lazy Suzan Bearings
- Magneto Bearings
- Rod End Bearings
- Agricultural Bearings
- Four Point Contact Bearings
- Automotive Products
- Bronze & Wrapped Bushes
- Show All Types
- Sealing
Products - Power
Transmission - Balls
& Rollers - Cycling
Products - Engineering
Parts- Pulleys
- Tapered Locking Bushes
- Couplings
- Speedi Sleeves
- External Circlips
- Internal Circlips
- E-Clips
- Round Wire Snap Rings
- Jubilee Clips
- Nilos Rings
- Spring Grip Clips
- Cotter Pins
- Sealing Washers
- Nuts
- Set Screws
- Shaft Collars
- Castor Wheels
- Ball Transfer Units & Clamp Rings
- Assorted Kits
- Cleaning Products
- Padlocks & Chains
- Grease Fittings
- Gloves
- Show All Types
- Tools
- Lubrication
& Adhesives - Garden Parts & Accessories
Close X
Price Breaks
Quantity
Prices
2+
£1.43 each
19+
£1.35 each
29+
£1.33 each
39+
£1.32 each
49+
£1.30 each
74+
£1.29 each
99+
£1.20 each
199+
£1.19 each
249+
£1.17 each
499+
£1.16 each
999+
£1.12 each
16x24x4mm Nitrile Rubber Rotary Shaft Oil Seal R21 / SC
Spotted a mistake on this product?0.002000kg
Chemical Resistance Table [Click Here]
Share this product with Friends or Colleagues
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. |
Brand / Quality: Simply NBR Seals - High Quality
Inside Diameter: 16mm
Outside Diameter: 24mm
Width: 4mm
Inside Diameter: 16mm
Outside Diameter: 24mm
Width: 4mm
Shaft Size not Inside Diameter (d)
=
16mm
Outside Diameter (D)
=
24mm
Width (b)
=
4mm
| 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. | |
 |
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 |
|
-
Taylor Austin, United Kingdom 20/01/2020
This was my first time using your website and i will definitely be using it again.
-
Nicolas Aldo, United Kingdom 18/12/2019
The oil seals i recieved were in great conditon and just what i needed
-
Talan Wallis, United Kingdom 26/09/2019
Using the website to find my required oil seals was a simple and quick process, thank you.
-
Humberto Finley, United Kingdom 09/08/2014
Good quality but a bit pricey - cant find them elsewhere though. Cheers
Related Products
Simply Bearings Ltd
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
Greater Manchester
WN7 3XJ
United kingdom
A link to this product has been copied to your Clipboard
Thank you, your email has been sent.
The product has been added to your saved list.
We have sent you an email.
You must click the link in the email to activate your saved list.
We found an existing Saved List for your email address so we have sent you an email with details of how to access the list.