objective 21.01 identify types of fasteners. types of fasteners nails are metal fasteners driven...
Post on 03-Jan-2016
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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
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