Objective 21.01

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