A machine bolt is a variety of fastener that includes a cylindrical body with a shank and threaded suffix, together with a hexagonal or square head. These usually work together with a nut or tapped hole to make a strong mechanical bond. Unlike screws, which are sometimes driven directly into a material, machine bolts rely upon a combination of torque and tension for secure fastening. https://www.dalloyedbolts.com/machine-bolts-manufacturers-suppliers-stockists-exporters.html