Home Standard
PTFE Shapes
Special
PTFE Shapes
Injection
Molding
PTFE MixBars Case
Studies
Literature PDF's Technical FAQ Contact Us
Technical : 8.1 Interference Fit vs. Nominal Sizing

8.1 Interference Fit vs. Nominal Sizing

Although a slip-fit may allow faster, easier assembly, an interference fit is generally preferred.  This results in acquiring a seal on initial assembly, leaving maximum adjustment available to compensate for future wear.

If a packing-ring set is selected with nominal sizes of 1-1/4" ID and 1-3/4" OD, the shaft is assumed to measure 1.250" and the bore to measure 1.750".  Ideally the packing-ring set ID  will measure 1.250" plus nothing minus “something”, and the OD will measure 1.750" minus nothing plus “something”.  Due to process variances the packing-ring sets will occasionally deviate in size but will function regardless.

Back To Index
Plastic Injection Molding Services

3692 Milwaukee Avenue Chicago, Illinois 60641
Phone: (773) 282-3787 Fax: (773) 282-2333
E-mail: contact@parksideind.com
Plastic Injection Molding Services
© 2014 Parkside Industries Corporation