1/4-20 x 1-1/2 Inch Coarse Zinc Plated Grade 2 Flat Head Elevator BoltElevator bolts are threaded fasteners with a thin body and round head. These bolts may have either a square or ribbed neck to stop bolts from turning when a nut is tightened. They are used in tight spaces with moving parts such as in elevators and conveyor belts. With a thin head they fit flush against the connection surface and dont interfere in small or confined operational systems.