HOLLAND Mushroom Series
The Mushroom style is the traditional, historic configuration for kingpins.
For non-AAR (American Association of Railroads) applications.
This model, when properly installed, meets or exceeds the performance requirements of the Truck and Trailer Manufacturers Association (TTMA) and the Society of Automotive Engineers (SAE).
Specifications:
Material: AISI 8630H Alloy Steel
Hardness: 302-363 BHN
Quality: Manufactured to a proprietery standard for both
surface and interior sound, and for dimensional
accuracy.