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1 3. Do not bear bolt threads on wood, but use washers under head and nut where both <br /> 2 bear on wood, and use washers under all nuts. <br /> 3 <br /> 4 C. Screws: <br /> s <br /> 6 1. For lag screws, pre-bore holes same diameter as root of threads, enlarging holes to <br /> 7 shank diameter for length of shank. <br /> 8 <br /> 9 2. For wood screws, pre-bore holes 80 percent of the root diameter, enlarging holes to <br /> 10 seven-eights the shank diameter for length of shank. <br /> 11 <br /> 12 <br /> 13 <br /> 14 <br /> 15 <br /> 16 END OF SECTION <br /> 1 <br /> ROUGH CARPENTRY <br /> 042894 06100-6 <br /> f <br />