Design

Commonly used basic oil seal designs are defined in the relevant international standards. In the following table, you can see the basic designs specified in these standards and the matching of ‘type codes’ in Suptex rotary shaft products. There are many more design types than these basic geometries. But these seal designs represent a large amount of the products in practice.

(TABLE)
DIN 3761
Design		 Suptex
DMK Type		 Profile Explanation
A KK Rubber covered, with spring, oil lipped
AS KK-T Rubber covered, with spring, oil and dust lipped
B SL Metal-cased, with spring, oil lipped
BS SL-T Metal-cased, with spring, oil and dust lipped
C SKL Metal-cased and covered, with spring, oil lipped
CS SKL-T Metal-cased and covered, with spring, oil and dust lipped

Rotary shaft applications are diverse. Often it is necessary to work on the application and develop special geometry and material according to the predicted performance conditions. Besides, you can take a look at the following table to guide you when choosing seal design, especially for common industrial applications called ‘classic’ or ‘conventional’.

In this table, you can query the most common seals for your expectations. You can take advantage of these inquiry results especially when choosing products from catalog or lists.

(CODE)

 
    KK KK-T SL SL-T SKL SKL-T KK-B KK-T.B SL-B SL-T.B KK-5 KK-T.5 SL-5 SL-T.5 SLK-Tf SLK-Tf.T KK-Tf KK-Tf.T KK-Kb SL-Kb KK-Ks SL-Ks KK-CT KZ
   
Rough housing bore (Ra> 2.5 um)   + + - - - - + + - - + + - - - - + + + - + - + 0
Impact resistance in installation   0 0 - - + + 0 0 - - 0 0 - - 0 0 0 0 0 0 0 0 0 0
Ease of installation   0 0 0 0 0 0 0 0 0 0 0 0 0 - - - - - 0 0 0 0 0 +
High stability in housing bore   0 0 + + + + 0 0 + + 0 0 + + + + 0 0 0 + 0 + 0 -
Pressurized fluid (> 0.5 bar)   - - - - - - + + + - - - - 0 0 0 0 - - - - - - -
Very agressive fluid as a chemical   - - - - - - - - - - - - - - + + - - - - - - - -
Very high fluid temperature(>200°C)   - - - - - - - - - - - - - - + + - - - - - - - -
High shaft speed(>10 m/s)   0 0 0 0 0 0 - - - - 0 0 0 0 + + + + - - - - - -
Grease or dust seal   0 0 0 0 0 0 0 0 0 0 + + + + 0 0 0 0 0 0 0 0 0 0
Low oil or dry operation   - - - - - - - - - - 0 0 0 0 + + + + - - - - - -
Less-medium dirt, filth in external environment   0 + 0 + 0 + 0 + 0 + 0 + 0 + 0 + - + - + 0 0 0 0 0 0
High dirt, filth in external environment   - 0 - 0 - 0 - 0 - 0 - 0 - 0 - 0 - 0 + + + + + -

+               Recommended

0             Can be used

-               Not Recommended