Mechanical Seals for Pump Shafts

Need a seal that lasts longer than the last one?

Selecting a pump seal does not need to be difficult. We specialize in analyzing spring mechanical pump shaft seals and can help you analyze why your seal failed, and select a seal best suited for your application.

If you have an existing pump seal number such as XX-100, you're more than half way there. The next step is to consider the fluid your pumping, how abrasive, acidic or alkaline it is. If the speed or tempertature is exceptional make not of it too.

Type 1- Type 2, Type 21

Head Types

Type 1

Type 2

Type 21

Type 21

ASP-21   ASP-1   ASP-2  

Pump Seal Dimensions


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

Sizing Mechanical Pump Seals


Seat Types

cup mount seat

o-ring mount seat

L-Shape Seat

clamp mount seat

Your stationary seat must fit properly. Pleaseprovide the inside dimension of the bore it will be fitting into. 

As long as the pump bore is larger than the OD of the rotory your good. The more space between the mechanical seal and the bore the better your seal will be colled by the pump fluid.  

For your seal 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. Niresist   
AFLAS TM M. Molded Plastic   L. Silicon Carbide  
Secondary Seals        
PTFE     Z. Tungston Carbide  
I. Non Asbestos Z. Tungten Carbide      

A sample material code could be:      B C F L F
"Inquiry Form"


 Provideing all your mechanical seal requirments


Our Select Manufacturers

  • Sepco
  • FMI-Spa
  • Flow Serve
  • AST

Our Select Manufacturers

  • Utex Industries
  • Graftech
  • Lamons
  • Vulcan


  • Call us at: 714-361-1435
  • Fax: 714-593-9701