KingPins

Need Kingpin Products fast?

Find a JOST dealer near you!

JOST kingpins have proven themselves mile after mile over the world’s most challenging roads. Steel forged for superior strength, JOST kingpins deliver the optimal balance between wear resistance and impact resistance. For quality, safety, and durability, JOST kingpins meet or exceed international standards for OEMs and fleet use in North America and internationally.

AAR Cruciform Style Kingpin

JOST AAR cruciform kingpins are suitable for OEM and aftermarket replacement. They are intended to be installed by welding, using a procedure published by the American Welding Society or other technical organizations. When properly installed, JOST cruciform style kingpins will meet or exceed the performance requirements of the American Associate of Railroads (AAR) standard M-931 as well as the Society of Automotive Engineers (SAE) and the Truck and Trailer Manufacturers Association (TTMA).

AAR Cruciform Style Kingpin - Specifications

Material:  AISI 4320H

Heat Treatment
JOST AAR cruciform style kingpins are through-hardened using a quench and temper process, which produces a surface hardness of 380-420 BHN.

Strength
At the above hardness, the material will have an approximate 190,000 psi ultimate strength and 145,000 psi yield strength.

Impact & Wear Resistance
The high nickel alloy and heat treat process work together to provide an ideal balance between hardness (wear resistance) and low brittleness (good impact resistance).

Quality Assurance

  • 100%  Brinell hardness testing
  • 100%  Magnetic particle inspection
  • 100%  Ultrasonic testing (MS105, tightened C=0)

SAE Mushroom Style Kingpin

JOST SAE mushroom-style kingpins are suitable for OEM and aftermarket replacement. They are intended to be installed by welding, using a procedure published by the American Welding Society or other technical organizations. When properly installed, JOST SAE mushroom-style kingpins will meet or exceed the performance requirements of the Society of Automotive Engineers (SAE) and the Truck and Trailer Manufacturers Association (TTMA).

SAE Mushroom Style Kingpin - Specifications

Material:  AISI 8630H

Heat Treatment
JOST SAE mushroom-style kingpins are through-hardened using a quench and temper process, which produces a surface hardness of 302-363BHN.

Strength
At the above hardness, the material will have an approximate 150,000 psi ultimate strength and 115,000 psi yield strength.

Impact & Wear Resistance
The high nickel alloy and heat treat process combine to provide an ideal balance between hardness (wear resistance) and low brittleness (good impact resistance).

Quality Assurance

  • 100%  Brinell hardness testing
  • 100%  Magnetic particle inspection
  • 100%  Ultrasonic testing (MS105, tightened C=0)

SAE Spool Style Kingpin

JOST SAE spool-style kingpins are suitable for OEM and aftermarket replacement. They are intended to be installed by welding, using a procedure published by the American Welding Society or other technical organizations. When properly installed, JOST spool style kingpins will meet or exceed the performance requirements of the Society of Automotive Engineers (SAE) and the Truck and Trailer Manufacturers Association (TTMA).

SAE Spool Style Kingpin - Specifications

Material:  AISI 8630H

Heat Treatment
JOST SAE spool style kingpins are through-hardened using a quench and temper process, which produces a surface hardness of 302-363 BHN.

Strength
At the above hardness, the material will have an approximate 150,000 psi ultimate strength and 115,000 psi yield strength.

Impact & Wear Resistance
JOST’s unique combination of a high nickel alloy and exacting heat treat process provides a good balance between hardness (wear resistance) and low brittleness (good impact resistance).

Quality Assurance

  • 100%  Brinell hardness testing
  • 100%  Magnetic particle inspection
  • 100%  Ultrasonic testing (MS105, tightened C=0)

AAR Square Spool Style Kingpin

JOST AAR square spool-style kingpins are suitable for OEM and aftermarket replacement. They are intended to be installed by welding, using a procedure published by the American Welding Society or other technical organizations. When properly installed, JOST square spool-style kingpins will meet or exceed the performance requirements of the Society of Automotive Engineers (SAE) and the Truck and Trailer Manufacturers Association (TTMA).

Square Spool Style Kingpin - Specifications

Material:  AISI 8630H

Heat Treatment
JOST SAE spool style kingpins are through-hardened using a quench and temper process, which produces a surface hardness of 302-363 BHN.

Strength
At the above hardness, the material will have an approximate 150,000 psi ultimate strength and 115,000 psi yield strength.

Impact & Wear Resistance
JOST’s unique combination of a high nickel alloy and exacting heat treat process provides a good balance between hardness (wear resistance) and low brittleness (good impact resistance).

Quality Assurance

  • 100%  Brinell hardness testing
  • 100%  Magnetic particle inspection
  • 100%  Ultrasonic testing (MS105, tightened C=0)

Bolt-in Style Kingpin

JOST bolt-in kingpins are suitable for OEM and aftermarket replacement. A smart kingpin option for high-use applications, once the retention plate is installed the kingpin can be easily replaced in minutes by just removing the mounting bolts. The retention plate is intended to be incorporated into the design of the upper coupler structure similar to that of an SAE mushroom-style weld in kingpin. It must be welded using a procedure published by the American Welding Society, or other technical organizations.

When properly installed bolt-in kingpins will meet or exceed the performance requirements of the Federal Motor Carrier Safety Regulations (FMCSR), The Society of Automotive Engineers (SAE), and the Truck and Trailer Manufacturers Association (TTMA).

Key Features of JOST Bolt-in Kingpins

Simple Replacement
Once the retention plate has been installed, kingpin replacement takes just minutes. This makes for a much easier, and more economical kingpin option.

Reduced Potential for Center Loading
Both the kingpin flange and bolts are recessed into the retention plate. This reduces the possibility of center loading the fifth wheel coupling.

Safe, Reliable Manufacturing Methods
Every JOST kingpin, including bolt-in kingpins, are manufactured and inspected using the most stringent safety requirements.

High-Quality Steel
JOST bolt-in kingpin retention plates are manufactured from ST-52-3 Steel (similar to ASTM A572 Grade 50) providing strength and durability.

Interested In JOST Kingpin Products?

Use our dealer locator tool to find a certified parts dealer near you.

h

Request Info

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

~

Warranty Statements

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

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.

JOST International is a world market leader for the commercial trucking industry. As a pioneer of efficient, safe, and innovative systems for trucks and trailers, we proudly supply fifth wheel couplings, trailer landing gear, kingpins, turntables, and more.

JOST International - Member of JOST-World