Audel Carpenters and Builders Math, Plans, and by Mark Richard Miller, Rex Miller

By Mark Richard Miller, Rex Miller

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Most will never be needed. 900 Strength of Wood Screws Table 1-7 gives the safe resistance, or safe load (against pulling out), in pounds per linear inch of wood screws when inserted across the grain. For screws inserted with the grain, use 60 percent of these values. The lateral load at right angles to the screw is much greater than that of nails. For conservative designing, assume a safe resistance of a No. 20 gauge screw at double that given for nails of the same length, 22 Chapter 1 ROOT DIAMETER DRILL HOLE FULL LENGTH OF SHAFT FULL LENGTH (HARDWOOD) DRILL PILOT HOLE ABOUT 3/ THREAD 4 LENGTH (SOFT WOOD) DRILL SAME SIZE AS SHANK DIAMETER DRILL ROOT DIAMETER OF THREAD Figure 1-19 Drilling shank-clearance and pilot holes.

Second, should you tire of an item at some time in the future; screws usually let you disassemble it without great travail. It is possible to damage the work if it is nailed together and you want to take it apart. These advantages cost more in the effort and time it takes to install screws. Screws are normally used to fasten things such as hinges, knobs, and so on, to structures, and in the assembly of various wood parts. Nails, Screws, Bolts, and Other Fasteners 17 They are not used in heavy building simply because, in this type of work, things are built so that there is a minimum of stress on the fasteners and the withdrawal resistance is not required.

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