Hub Caps

PSI™ Hub Caps

STEMCO has engineered the P.S.I. hub cap designed to meet the specific performance expectations of each fleet, all in an effort to maximize performance and value.


STEMCO MTIS/PSI™ hub caps are available in both oil and grease hub caps for several popular applications. The oil hub caps (343-4370, 343-4371 and 343-4372) have a side fill plug and a standard window with oil fill lines. The grease hub caps (340-4370, 340-4371 and 340-4372) do not have a side fill plug and incorporate a gray opaque window with no markings.

The PSI™ tee fitting and flapper valve are to be installed in the center of the hub cap and are available from Meritor or PSI™ as a part of the PSI™ system. For more information regarding the PSI™ System, contact PSI™ at (210) 222-1926.

The Aluminum STEMCO hub cap has provided safe and secure wheel end protection for over 60 years.

  • Related Literature
  • Videos
  • Training

STEMCO Wheel End Catalog
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STEMCO Quick Reference Catalog
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STEMCO Wheel End Brochure
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Tech Tip #52 – Hub Cap Torque Values and Bolt Specifications
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Inspection Rebuild Reassembly of Submerged Tractor and Trailer Wheel Ends
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Tech Tip #11- Hub Cap Lubricant Installation Procedure
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