Knowing the names and the specific types of screws , bolts , washers, or nuts you will need for your current or future DIY project is very important. Simply knowing the head type on a screw or bolt can let you know what type of screwdriver or socket type you will … Chicago Bolts . Chicago bolts , barrel nuts or sex bolts are all names for the same uniquely-shaped type of bolt . Unlike other bolts, which have threading along the outside of a cylindrical shaft, the Chicago bolt has a hollow shaft that is smooth on the outside and threaded along its interior. This form is also known as a female thread. Feb 21, 2019 Various nuts , bolts and screws. Hex screws can be turned with wrenches. Lag screws, which have coarse threading and a hexagonal head, can be used to secure wooden planks and other materials. Pieces of sheet metal might be secured to each other or to another surface with sheet metal screws. Allen wrenches - can be used with hex screws.

Identification Charts for Different Types of Fasteners : Head styles, Bolt and Screw , Drive, Washer and Nut types. The use of forces such hereic force or even frictional force can also join materials. Stainless steel, carbon steel, and alloy steel are the three major steel fasteners manufactured in industries fasteners . Shoulder Bolts. Shoulder bolts (also known as shoulder screws or stripper bolts) are machine screws with a shoulder between the thread of the screw and the head of the part. Once installed, the non-threaded portion extends out of the surface of the application site, allowing the bolts to act as dowels or shafts for moving parts. Types of Screws Names ; Types of Screws Names By Timothy Sexton. eHow . Lag Bolt . A lag bolt is actually a screw that is very large and only partly threaded. The head is square and needs to be turned with a wrench rather than a screwdriver. The lag bolt is used when a standard wood screw simply isn’t strong enough.