There are three types of Holland couplers:
A rigid mount coupler has the coupler body fixed in location after mounting on the towing vehicle. It includes a secondary lock and is appropriate for over-the-road applications.
Industrial and Airport Ground Support Equipment
These couplers are intended for industrial material handling and airport ground support applications and are not approved for over-the-road use. They do not include a secondary lock, but feature special release systems.
A ball hitch is a ball and coupler coupling device that provides a positive, no-slack fit. These hitches allow oscillation up to 30 degrees in all directions. A ball hitch is used in applications where minimal slack is desired and a high degree of articulation or oscillation is needed
Couplers | BH-50
A versatile ball hitch configuration is ideal for extreme-duty on- and over-the-road applications where extremely high articulation (up to 30°) in all directions is required. Especially where a hinged-tongue drawbar is used.
Ideal in applications where the vehicle and trailer are frequently coupled: logging, gravel, liquid bulk, and grain trailers.
The jaws and 5 inch (12.7 cm) diameter ball are steel alloy, machined and heat treated for superior strength, toughness, and durability