Nuts and Bolts

Wrenches of all types are used with:

A variety of threaded fasteners called bolts and nuts

A bolt has:

External Threads

A nut has:

Internal Threads

Bolts typically have a hexagonal or square head, which is:

Held in place with a wrench while the nut is tightened(also with a wrench) to fasten the assembly

A threaded bolt can only be inserted into:

A nut or hole that has a similar thread

While there is not a clear cut distinction between screws and bolts, the most practical way to distinguish between the two is based upon:

The shape of the head and what tool is used to install or remove the fastener

What has a hexagonal or square head and are used with a wrench and nut?

Bolts

What has a round head with an indentation that matches the screwdriver that must be used to install or remove the screw?

Nuts

Both fasteners are:

Threaded on part or all of the shaft

Nuts thread onto:

Bolts to clamp assemblies together, and usually have a hexagonal head or square head, and can be locked into position using several different methods

Wing nuts make it possible to:

Disassemble a component by hand

The two “wings” attached to the nut:

Make it easy to tighten and loosen without the aid of hand tools

A Castellated Nut uses:

A cotter pin to lock it into place

The cotter pin passes through:

A hole in the bolt or stud that the nut is threaded on, engaging the cutouts in the nut

Lock nuts have a nylon insert:

Incorporated into its threads that provides enough interference to prevent the nut from loosening, thus locking it in place

The type of threat that is placed on a fastener will vary:

According to the diameter of the fastener and the intended strength of the finished product

Threads are identified by their pitch, and this is measured:

Using a thread pitch gauge

Unified National Coarse(UNC) or coarse thread would have:

Relatively few threads per inch

United National Fine(UNF) would have:

A larger number of threads per inch