4" Universal Aluminum Hub Cap ST-400D


ST-400D manufactured by Valcrum fits 9K (after 10-1-89), 10K, 12K and 15K axles. The 4” universal threaded hub cab features an aluminum alloy body, designed for grease and oil bath applications. There is an oil level indicator and magnetic vent plug that removes metal particles. 

SKU: ST-400D replaces 21-036, 21-36, K71-148-00, 21 36

  • Plug, seals & hardware included
  • 1/8”-27 NPTF plug included
  • 4” Machined Threads
  • Replaces Dexter 21-36, ST-400 prior 08/2019


  • 9,000-lb Axles manufactured from October 1989 to July 2009
  • 10,000-lb Axles manufactured prior to July 2009
  • 12,000-lb and 15,000-lb Heavy-duty axles

Each Hub Cap contains:

  • (1) hub cap
  • (1) gasket
  • (1) lens
  • (1) retainer ring
  • (1) foam gasket
  • (6) Torx Screws
  • (1) magnetic vent plug
  • (1) 1/8 -27 Plug
  • (1) O-Ring

Frequently Asked Questions

Q;  What is a universal threaded hub cap?
A:  A threaded hub cap that replaces standard factory plastic oil bath caps.

Q:  Can I convert oil bath hubs to grease filled hubs with universal hub caps?
A:  Yes, universal hub caps are both grease/oil bath compatible.

Q:  Will this work on my trailer hub?
A:  Please refer to the Universal Oil Caps Reference table for fitment information.

Universal Oilcap Reference Table

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