Screw Fasteners

Threaded fasteners make it possible to create detachable connections of parts and structures in mechanical engineering, furniture manufacturing, and construction.

For these purposes, bolts, screws, and threaded studs are used, having the form of a rod with external metric or tapered inch thread.

Description and installation features of threaded fasteners

• Bolts. They are passed through a smooth through-hole in the parts being joined and tightened with a nut on the threaded side. They allow the structure to be quickly assembled and disassembled. Most often they have a hexagon head for a wrench (standard, reduced, or increased size). Furniture bolts come with a countersunk head, eye bolts with a ring-shaped head, and T-slot bolts with a T-shaped head. To prevent self-loosening, bolts are secured using spring lock washers or lock washers, cotter pins, or lock nuts.
• Screws. One of the parts being joined has a smooth hole, while the other has an internal thread into which the screw is driven. It can have a flat, domed, round, or countersunk head (conical in shape, for recessing into the material). To drive the screw, facets, flats, slots, or holes for a wrench or screwdriver are made on the head or directly on the end face.
• Threaded studs. A versatile fastener in the form of a rod with external thread along its full length or at the ends. A threaded stud makes it possible to join parts of different thickness, with smooth or threaded holes, as well as parts spaced apart from each other. If necessary, the threaded rod is cut to the required length. Threaded studs are secured using nuts, anchors, or welding.