JSK37UB SERIES FIFTH WHEELS 

Built for Tough Enviroments
The steel wear ring is designed for environments that are hard on the throat of the fifth wheel. Made with alloy steel hardened to 262 - 321 BHN. This will provide lasting performance, keeping your fifth wheel on the road longer.
Convenience
The steel wear ring is replaceable and can be quickly changed when it gets worn. It can also be used in place of the standard cushion ring on your JOST fifth wheel.

  • Available with a cushion ring or steel wear ring
  • Infinite adjustment
  • 3-Point Locking System
  • Anti-high coupling lugs
  • Requires only 60lbs of force to open
  • Can be rebuilt on truck in 30 minutes without removing the top plate

If you don't see your part number check the links below or contact sales.

JSK37uB
Steel Ring
37USK_33
37FSL.88
UB conversion

Key Features & Benefits

JSK37U Series

Fifth Wheel Feature

Replaceable Cushion Ring

A replaceable cushion ring reduces the lifetime cost of ownership. JOST parts across product lines ensure affordable, consistent product availability.

JOST Locking Mechanism

JOST Locking Mechanism

JOST’s signature 3-point locking system features three locks with just four moving parts to ensure ultimate safety & simplicity.

Anti-High Coupling Lugs

Anti-High Coupling Lugs

Innovative anti-high coupling lugs prevent drivers from high coupling by either guiding the kingpin into the jaws or pushing it up and over. This allows for a clear indication when the fifth wheel is properly coupled.

Download the jost fifth wheel catalog

A comprehensive look into each of the JOST fifth wheel products.

Download Catalog
Download Catalog

Parts, Assemblies & Specs

JSK37U Series

JOST’s JSK37U Series is available in standard, air release, and low lube top plate options, all of which seamlessly pair with a range of mount styles to suit any commercial trucking application. The JSK37U series has a maximum vertical rating of 55,000 lbs and a maximum horizontal rating of 150,000 lbs.

All JSK37U Series options are available below:

Additional Service Tools & Parts
Bracket Exchange Program

The JOST Bracket Exchange Program offers additional flexibility. JOST will send a new bracket to you, in return of your current bracket.

Please call Customer Service at 800-253-5105 to learn more.

INSPECTION & MAINTENANCE GUIDELINES
Download Guide
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Request Info

Looking for more information? Have a question about a product or part? Fill out the form to submit your request.

Request Form
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Warranty Statements

Claims should be filed with JOST or any authorized sales or service outlet within 60 days of product failure.

Jost Warranty

Support Help

Have a question you’d like to talk to us about? We’re here to help. Just let us know what you’re looking for.

Contact Sales