Bolt and Screw Types

Type	Description	Usage
Hex Head Bolt	Bolt with a hexagonal head and threads for use with a nut or in a tapped hole.	General-purpose, construction, machinery.
Hex Cap Screw	Similar to a hex head bolt but with a washer face under the head and a chamfered end.	High-strength applications, machinery, automotive.
Carriage Bolt	Bolt with a rounded head and a square neck to prevent rotation when tightened with a nut.	Woodworking, furniture assembly, decorative applications.
Machine Screw	Small-diameter screw with a flat or round head, used with a nut or in a tapped hole.	Electronics, appliances, machinery.
Wood Screw	Threaded screw with a tapered point, used to fasten wood to wood or metal.	Carpentry, woodworking, furniture.
Sheet Metal Screw	Threaded screw with a sharp, pointed end for use in sheet metal.	Sheet metal, ductwork, automotive.
Socket Head Cap Screw	Screw with a cylindrical head and internal hex drive.	Machinery, automotive, aerospace.
Set Screw	Headless screw with internal drive, used to secure an object within or against another object.	Shaft collars, gears, pulleys.
Toggle Bolt	Bolt with a spring-loaded wing nut used to provide a secure anchor in hollow walls.	Drywall, hollow doors, ceilings.
Eye Bolt	Bolt with a looped head used to attach cables or ropes.	Lifting, rigging, anchoring.
Lag Bolt	Heavy-duty screw with a square or hexagonal head, used for securing wood to wood or metal.	Decking, fencing, heavy carpentry.