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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.…

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…

This medieval elevator shows the use of two simple machines: wheel and axle on the right, and a pulley on the left. "An elevator of the Middle Ages. History tells us this form of elevator was used in monasteries for hoisting passengers and supplies." -Hill, 1921

Early Elevator

This medieval elevator shows the use of two simple machines: wheel and axle on the right, and a pulley…

Examples of inclined planes, which is a tilted surface that objects can easily roll off of.

Inclined Planes

Examples of inclined planes, which is a tilted surface that objects can easily roll off of.

Each of these are an example of the simple machine: lever. F c is the power arm and F w is the weight arm. W is the weight and P is power

Simple Machines

Each of these are an example of the simple machine: lever. F c is the power arm and F w is the weight…

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…

Allen headless set screw is a hex socket screw used to fasten two objects.

Allen Headless Set Screw

Allen headless set screw is a hex socket screw used to fasten two objects.

A collar screw is used as mechanical stops, locating components, and bearing faces. The screw is commonly found in machines, usually in power transmission, motors, and gearboxes.

Collar Screw

A collar screw is used as mechanical stops, locating components, and bearing faces. The screw is commonly…

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…

The lag screw is used in fastening heavy timbers with a square or hexagonal head.

Lag Screw

The lag screw is used in fastening heavy timbers with a square or hexagonal head.

A shoulder screw, also known as stripper bolt, is a fastener where the thread ends at the larger diameter. The screw usually used in machinery.

Shoulder Screw

A shoulder screw, also known as stripper bolt, is a fastener where the thread ends at the larger diameter.…

Illustrations showing the six mechanical powers: lever, wheel and axle, pulley, inclined plane, wedge, and screw.

Simple Machines

Illustrations showing the six mechanical powers: lever, wheel and axle, pulley, inclined plane, wedge,…

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…

The wood screw used to fasten two pieces of wood together. Wood screws usually have unthreaded shank below the head.

Wood Screw

The wood screw used to fasten two pieces of wood together. Wood screws usually have unthreaded shank…