Pump Shaft Seals

We specialize in single spring mechanical pump shaft seals for rotary / centrifugal pump applications. It's easy to replace your pump seals if you know what they are. If you do not have a pump seal number such as PS-100, you can identify what kind of seal you have, by comparing your mechanical seal components to the pictures.

Type ASP-21 Type ASP-2 Type ASP-1
(Click the above links for a cross sectional drawing of the selected seal.)

Spring Seals

Mechanical Seals: Working Length

The "working length" of the seal is critical to your seal application.  To identify  the working length, measure your mechanical seal end to end as it is pictured above, this is your seals "total length".  From this you must subtract 50% of the   uncompressed spring length. This is your mechanical seals working length.

For seal dimensions follow this link and look up the seal by shaft size and "Type" (A,B,C,D,E,F,K,N,Q,R,S,T or ,U)

For instructions on how to identify a used seal follow this link


To make sure your pump seals stationary seat fits, it's a good idea to provide the inside dimension of the bore it will be fitting into.  The outside dimension of your seals stationary seat is helpful but more difficult to obtain an accurate measurement. Most pump seal stationary seats have rubber cups or o-rings that must be compressed when they are installed.

Seat Types


Mechanical Seals: Material Codes

To decipher a mechanical seals materials code,  use the following chart

Elastomers Seal Face Metal Parts Seal Seats Springs
B. Buna A. Bronze A. Bronze A. Bronze E. Monel
V. Viton C. Carbon D. Brass G. Cast Iron F. Stainless
N. Neoprene H. Glass Filled PTFE E. Monel J. Ceramic  
    F. Stainless K. Ni-resist   
AFLAS TM M. Molded Plastic   L. Silicon Carbide  
Secondary Seals        
T- PTFE     Z. Tungsten Carbide  
I. Non Asbestos Z. Tungsten Carbide      

A sample material code could be:  B C F L F
"Inquiry Form"  
(on-line only)

If you open this link in another browser window  it will make it easier to complete. 

 Mechanical Seals

See why we are a trusted source for industrial supply needs and call us today!

 Viton is a trademarks of Dupont Dow Elastomers
 *Trademark of Asahi Glass Co. Ltd

Last Updated on 8/02/2002 
By American Seal & Packing

Copyright Steadman & Associates, Inc. 2003