Quantcast Figure 3-76.-Nail sizes given in penny (d) units.

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The size of a nail is measured in a unit known as a  penny.  Penny  is  abbreviated  with  the  lowercase letter  d. It  indicates  the  length  of  the  nail.  A  6d (6-penny)  nail  is  2-inches  long.  A  10d  (10-penny)  nail is  3-inches  long  (figure  3-76).  These  measurements apply to common, box, casing, and finish nails only. Brads  and  small  box  nails  are  identified  by  their actual  length and gauge number. A  nail,  whatever  the  type,  should  be  at  least three times as long as the thickness of the wood it is  intended  to  hold.  Two-thirds  of  the  length  of the  nail  is  driven  into  the  other  piece  of  wood  for proper   anchorage. The  other  one-third  of  the length   provides   the   necessary   anchorage   of   the piece  being  fastened.  Protruding  nails  should  be  bent over  to  prevent  damage  to  materials  and  injury  to personnel. There are a few general rules to be followed in the use of nails in building. Nails should be driven at an angle  slightly  toward  each  other  to  improve  their holding  power.  You  should  be  careful  in  placing  nails to provide the greatest holding power. Nails driven with  the  grain  do  not  hold  as  well  as  nails  driven across the grain. A few nails of proper type and size, properly placed and properly driven, will hold better than a great many driven close together. Nails can generally  be  considered  the  cheapest  and  easiest fasteners to be applied. Figure 3-76.-Nail sizes given in “penny” (d) units. 3-53

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