The most commonscrews, and bolts.NailsThere are manyfastening devices are nails,types of nails—all of whichare classified according-to their use and form. Thestandard nail is made of steel wire. The wire nailis round-shafted, straight, pointed, and may varyin size, weight, size and shape of head, type ofpoint, and finish. The holding power of nails is.less than that of screws or bolts.The COMMON WIRE nail and BOX nail(fig. 6-83, view A) are the same, except that thewire sizes are one or two numbers smaller for agiven length of the box nail than they are for thecommon nail. The FINISHING nail (fig. 6-83,view B) is made from finer wire and has a smallerhead than the common nail, Its head may bedriven below the surface of the wood, whichleaves only a small hole that is easily puttied. TheDUPLEX nail (fig, 6-83, view C) seems to havetwo heads. Actually one serves as a shoulder togive maximum holding power while the otherprojects above the surface of the wood to makewithdrawal simple. The ROOFING NAIL (fig.6-83, view D) is round-shafted and galvanized. Ithas a relatively short body and comparativelylarge head. Like the common wire, finishing, orduplex nail, it has a diamond point.Besides the general-purpose nails shown infigure 6-83, there are special-purpose nails.Examples include wire brads, plasterboard nails,concrete nails, and masonry nails. The wire bradhas a needlepoint; the plasterboard nail has alarge-diameter flathead. The concrete nail isspecially hardened for driving in concrete. So isthe masonry nail, although its body is usuallygrooved or spiraled.Lengths of wire nails NOT more than 6 in.long are designated by the penny system, wherethe letter d is the symbol for a penny. Thus, a 6dnail means a sixpenny nail. The thickness of a wirenail is expressed by the number, which relates tostandard wire gauge. Nail sizes (penny and lengthin inches), gauges, and approximate number ofnails per pound are given in figure 6-83. Nailslonger than 6 in. (called SPIKES) are notdesignated by the penny. The general size and typeof nail preferable for specific applications areshown in table 6-4.Table 6-4.-Size, Type, and Use of Nails6-49
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