1. Objective 21.01
Identify types of fasteners

2. 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.

3. 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

4. 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

5. 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

6. 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

7. 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

8. 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