bolts & screws flashcard

Front

Which bolt head type is best for applications requiring high torque?

Back

Hexagonal bolts are best for applications requiring high torque due to their larger surface area for wrench engagement.

Front

A type of bolt distinguished by a short portion of the shank underneath the head being square or finned or ribbed.

Back

Carriage bolt is characterized by a square or ribbed section under the head, preventing it from turning when tightened.

Front

What is the common type of thread used in bolts?

Back

UNC (Unified National Coarse) is a common type of thread used in bolts, suitable for general applications.

Front

What is the purpose of a cotter pin?

Back

A cotter pin is used to secure a nut, increase preload, and prevent rotation in mechanical assemblies.

Front

What primarily causes shear stress in a bolt?

Back

Shear stress in a bolt is primarily caused by transverse loads acting perpendicular to the bolt's axis.

Front

Define a hexagonal bolt.

Back

A hexagonal bolt is a fastener with a hexagonal head, designed for high torque applications.

Front

What is a coupling bolt?

Back

A coupling bolt is a type of bolt used to connect two components, often featuring a smooth shank.

Front

Explain the difference between UNC and UNF threads.

Back

UNC (Unified National Coarse) threads are thicker and used for general purposes, while UNF (Unified National Fine) threads are thinner and used for precision applications.

Front

What is the function of a washer in bolt assemblies?

Back

A washer distributes the load of the bolt head or nut, preventing damage to the surface and reducing friction.

Front

What is preload in the context of bolts?

Back

Preload is the initial tension applied to a bolt, ensuring it remains tight under load.