Description / Abstract: Purpose. This standard includes definitions of coolant spigot/socket end-form dimensions for 6.4 mm through 50.8 mm in diameter.

Applicability. Coolant spigot/socket include end-forms made from steel or aluminum tubing, cast/machined, and plastic molded ends-forms typically found on radiators, heater cores, coolant hose tees, powertrain tubing, and other miscellaneous coolant plumbing.