The wishlist name can't be left blank
This website requires cookies to provide all of its features. By using our website, you agree to our use of cookies - Learn more - Accept
Your web browser (Internet Explorer) is no longer supported
Update browser More information
My Cart 0
quality Approved & certified
service 24x7 The foundation of our service
flexible Also custom made seals
+31 (0)38 - 30 32 700

Do you want to order for the first time?

Request a Login

Already a customer?

Click here to sign in

Oil seal OS-A12

6 Items

per page
Set Descending Direction
Shopping Options
Inside diameter
Outside diameter
Stock Indicator
  1. Zwolle 4 items
  2. Central warehouse 1 item
  1. Oil Seal NBR Type: OS-A12
    Dimensions: 13 x 19 x 3
    Part number: 542511
    In Stock
    More Details
  2. Oil Seal NBR Type: OS-A12
    Dimensions: 15.87 x 20.63 x 2.38
    Part number: 198809
    Delivery time: 2-3 days
    More Details
  3. Oil Seal NBR Type: OS-A12
    Dimensions: 18 x 24 x 4
    Part number: 542512
    In Stock
    More Details
  4. Oil Seal NBR Type: OS-A12
    Dimensions: 28.5 x 52 x 5
    Part number: 303260
    In Stock
    More Details
  5. Oil Seal NBR Type: OS-A12
    Dimensions: 4 x 9 x 3
    Part number: 542510
    In Stock
    More Details
  6. Oil Seal NBR Type: OS-A12
    Dimensions: 40 x 62 x 6
    Part number: 330821
    Delivery time: 4 weeks
    More Details

6 Items

per page
Set Descending Direction



  • Elastomer-coated OD, flat
  • Non-spring-loaded sealing lip ribbed OD available on request, type OS-G12

Special features

  • Non-spring-loaded lip design, for secondary sealing jobs e.g., grease sealing
  • Low friction
  • Compact design
  • Little installation space
  • Reliable static sealing inside housing
  • For housings with high thermal expansion, e.g., light metal housing
  • For split housings
  • For housings with increased surface roughness
  • No risk of fretting corrosion

Applications e.g.:

  • Secondary sealing jobs
  • Mechanical and apparatus engineering
  • Drive systems
  • Electric motors


Standard material

Elastomer NBR 70 black
Metal case Carbon steel according to DIN EN 10139

Special materials

Elastomer FKM
Metal case Stainless steel 1.4301

Application parameters

For the standard materials combination:

Temperature  -40°C to +100°C                                                                                           
Pressure depressurized
Shaft speed max. 6 m/s, and acc. to chart „Operating parameters for rotary shaft seals“
Media Mineral oil based lubricants, synthetic lubricants

When synthetic lubricants are used for which there is no empirical experience, test the compatibility in the laboratory or - better even - in practical trials. The operating temperature should not exceed 80°C.

Design information


Tolerance ISO h11
Hardness min. 45 HRC
Roughness Ra = 0,2 - 0,8 μm
Rz 1-5 μm 
Rmax ≤ 6,3 μm
Surface finish free of orientation (lead free)

Housing bore

Tolerance ISO H8
Roughness Ra = 1,6 - 6,3 μm 
Rz = 10 - 20 μm 
Rmax ≤ 25 μm


Please read our installation instructions.