Complete Guide to Bolt Types and Their Applications


By Stefano Dixon
2 min read


Types of Bolts

Types of Bolts

Type Description Applications
Hex Bolt A bolt with a hexagonal head and a machine thread for use with a nut or in a tapped hole. General purpose, construction, machinery.
Carriage Bolt A bolt with a rounded head and a square section underneath to prevent turning. Woodworking, securing metal to wood.
Lag Bolt A large, sturdy wood screw with a hex head. Heavy-duty applications, wood construction, decks.
Eye Bolt A bolt with a looped head for attaching cables or ropes. Lifting, securing cables, rigging.
J-Bolt A J-shaped bolt used for anchoring to concrete or hanging objects. Foundation work, securing machinery.
U-Bolt A U-shaped bolt with two threaded arms used to secure pipes or round objects. Securing pipes, automotive applications.
Anchor Bolt A bolt used to attach objects or structures to concrete. Construction, masonry.
Flange Bolt A bolt with a flange beneath the head to distribute the load. Automotive, manufacturing, machinery.
Socket Head Bolt A bolt with a cylindrical head and hex socket drive. Precision machinery, automotive, aerospace.
Toggle Bolt A bolt with a spring-loaded toggle used for hollow wall installation. Hanging heavy objects on drywall, ceilings.
Hex Flange Bolt A bolt with a hex head and a flange to spread the load. Automotive, manufacturing, machinery.
Square Head Bolt A bolt with a square-shaped head for use in tight spaces where a wrench can grip more easily. Construction, machinery, repair work.
T-Bolt A bolt with a T-shaped head that fits into a slot to prevent turning. Securing workpieces in machinery, automotive.
Shoulder Bolt A bolt with an unthreaded shoulder between the head and threads for rotating parts. Pulleys, gears, moving parts.
Elevator Bolt A bolt with a large flat head used in conveyor systems. Conveyor systems, elevators.
Step Bolt A bolt with a large, flat head used for safety in ladder rungs. Ladders, scaffolding, walkways.
Hanger Bolt A bolt with wood threads on one end and machine threads on the other. Woodworking, furniture assembly, mounting legs.
Captive Bolt A bolt that is fixed in place and used for animal slaughtering. Livestock industry, humane animal processing.
Tension Control Bolt A bolt with a spline to control tension during installation. Steel construction, bridge building.
Draw Bolt A bolt used to pull together two pieces, typically in woodworking. Woodworking, cabinetry, furniture making.