Objective 21.01

• Identify types of fasteners

Types of Fasteners

• Nails are metal fasteners driven into the material it holds.– Common nails are used for general construction

and have a flat head and diamond-shaped point– Finishing nails have small heads that can be set

below surface– Brads are thin, short nails with small heads.

Nails (Continued)

• Cut or casing nails are square on the ends and are used for tongue and groove board nailing

• Others-roofing, box, staple, duplex

Screws

• Screws are fasteners with threads that bite into the material they fasten– Kind based on material they hold – wood,

sheet-metal, drywall– Kind based on metal they are made from-steel,

brass

Screws (Continued)

• Kind based on shape of head-flat, round, oval, pan, etc.

• Size is determined by diameter (gauge) and length (inches) of the shank

Bolts

• Bolts are fasteners that require a threaded nut– A lag bolt is sometimes called a lag screw

because it has threads similar to a wood screw and does not use a nut

– A carriage bolt has a round head over a square shank or shoulders

Bolts (Continued)

• A stove bolt may have either a round head or a flat head and the shank is threaded the entire length from bottom to top

• A machine bolt has either a square head or a hex head and is threaded on the bottom for about 1”– It is not threaded all the way to the top

Bolts (Continued)

• A cap screw is much like a machine bolt but has threads the entire length, is usually 2” or less in length, threads into something other than a nut, and may have different kind of head