Machine bolts, also known as cross arm bolts, are used primarily in the pole line domain. Machine bolts possess square heads & a semi-cone point. They generally have a square nut assembled. Moreover, they are usually hot dip galvanized so as to secure the steel. We supply machine bolts up to 1-1/2″ diameter. These bolts seem to follow the guidelines pertaining to thread length, largely used in case of pole line fasteners.