Sometimes referred to as "crossarm" bolts or "through" bolts, Hubbell Power Systems (HPS) square head and hex head machine bolts are manufactured to HPS specifications that meet the requirements of ANSI C135.1 and are available in a range of thread diameters and lengths. The head is marked with an identifying "C" and the bolt includes an assembled square or hex nut that corresponds to the head shape. Threads are formed with the rolled thread process.