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| Common Fastener Types | |||||
| Hex bolts, or hex cap screws, are used in machinery and construction. Can be used with a nut, or in a tapped hole. Fully threaded hex bolts are also known as tap bolts |
| Machine screws are fully threaded for use with a nut or in a tapped hole. Certain types are some- times referred to as stove bolts. | | Carriage bolts have smooth, domed heads with a square section underneath that pulls into the material to prevent spinning during installation. |
| Wood screws have large threads and a smooth shank f or pulling two pieces of material together. They can be used in wood and other soft materials. |
| Socket screws are machine screws with an internal hex socket (Allen) drive. Longer lengths may have a smooth shank. |  | Nuts are used to fasten machine threaded fasteners in through-hole applications. Lock nuts help prevent loosening. |
| Sheet metal screws have sharp points and threads, and are designed to be driven directly into sheet metal. They can also be used in softer materials like plastic, fiberglass, or wood. |
| Lag bolts, or lag screws, are large wood screws with hex heads. Typically used for wood construction and landscaping. | | Washers spread the load over a greater surface area when tightening a bolt, screw or nut. Lock washers help preventing loosening. |
