A strong pin, or contrivance, used to fasten or hold something in place.

Bolt

A strong pin, or contrivance, used to fasten or hold something in place.

An illustration of the hexagonal bolt head showing measurements. The measurement of diameter, D, is used to calculate the dimensions. The diameter of the head and the nut, H, is 1 ½D ₌ ⅛, and the distance of T is half the diameter.

U.S. Standard Hexagonal Bolt Head

An illustration of the hexagonal bolt head showing measurements. The measurement of diameter, D, is…

This carriage bolt has a rounded head and a slotted drive.

Carriage Bolt

This carriage bolt has a rounded head and a slotted drive.

Carriage bolt is a fastener with a round head with a square head, and tightened by using a nut and wrench. The bolt is commonly used in furniture making.

Carriage Bolt

Carriage bolt is a fastener with a round head with a square head, and tightened by using a nut and wrench.…

A carriage bolt with a truss head and a wing nut.

Truss Carriage Bolt and Wing Nut

A carriage bolt with a truss head and a wing nut.

Expansion bolt is used to fasten lightweight objects. The bolt has an expansion jacket, where the mechanism expands when tighten.

Expansion Bolt

Expansion bolt is used to fasten lightweight objects. The bolt has an expansion jacket, where the mechanism…

Eye bolt has a looped end with threads at the opposite end. The bolt is primarily used in attaching cables to objects.

Eye Bolt

Eye bolt has a looped end with threads at the opposite end. The bolt is primarily used in attaching…

Hanger bolt is a fastener used in wood working with two different sized threads and some have no center threads.

Hanger Bolt

Hanger bolt is a fastener used in wood working with two different sized threads and some have no center…

A hex bolt used in carpentry is identified by its hexagonal head and (shown here) fully threaded.

Hex Bolt

A hex bolt used in carpentry is identified by its hexagonal head and (shown here) fully threaded.

A small block for holding a bolt.

Nut

A small block for holding a bolt.

Wing nut is a fastener with a threaded hole used to keep objects in place. Wing nut can be loosen or tighten by hand.

Wing Nut

Wing nut is a fastener with a threaded hole used to keep objects in place. Wing nut can be loosen or…

"The cutting-tool in a screw-cutting machine; a screw-plate." -Whitney, 1911

Screw Cutting Die

"The cutting-tool in a screw-cutting machine; a screw-plate." -Whitney, 1911

A section of a screw-cutting die.

Screw Die Section

A section of a screw-cutting die.

"A handle for holding the threaded die by which the thread is cut on a bar, a nut, or a pipe; a die-stock; a screw-plate." -Whitney, 1911

Screw Stock

"A handle for holding the threaded die by which the thread is cut on a bar, a nut, or a pipe; a die-stock;…

Drive screw is a threaded fastener used in industrial application. The screw is designed to last long by having a strong and durable head.

Drive Screw

Drive screw is a threaded fastener used in industrial application. The screw is designed to last long…

A wood screw with a flat head and slotted drive. Wood screws are unthreaded below the head and designed for attaching two pieces of wood.

Wood Screw

A wood screw with a flat head and slotted drive. Wood screws are unthreaded below the head and designed…

A wood screw with a flat head and slotted drive. Wood screws are unthreaded below the head and designed for attaching two pieces of wood.

Wood Screw

A wood screw with a flat head and slotted drive. Wood screws are unthreaded below the head and designed…

A wood screw with a flat head and slotted drive. Wood screws are unthreaded below the head and designed for attaching two pieces of wood.

Wood Screw

A wood screw with a flat head and slotted drive. Wood screws are unthreaded below the head and designed…

"Jewelers' box of dies, stocks, and taps (called a screw-plate set." -Whitney, 1911

Screw-Plate Set

"Jewelers' box of dies, stocks, and taps (called a screw-plate set." -Whitney, 1911

Turnbuckle is a screw device to adjust the tension or length of ropes, cables, tie rods, and other tension system.

Turnbuckles

Turnbuckle is a screw device to adjust the tension or length of ropes, cables, tie rods, and other tension…

A wrench is a tool used to provide grip and mechanical advantage in applying torque to turn objects usually rotary fasteners, such as nuts and bolts or keep them from turning

Nut and Pipe Wrench

A wrench is a tool used to provide grip and mechanical advantage in applying torque to turn objects…