Size and Placement of Lag Bolts

TM 43-0156

(c)

Size and Placement of Lag Bolts. Lag bolts shall be 3/8-inch diameter and 3 inches long. Make

lag bolt entry holes 3/8-inch diameter. Lead holes shall be 1/4-inch diameter for groups I, II, and III woods, and

5/16-inch diameter for group IV woods. The combined depth of the entry and lead holes shall equal the total

length of the shank and threaded portions. Turn lag bolts in their holes the full distance. Do not drive bolts by

hammer. If for any reason the threads in the holes are stripped, remove the lag bolt and place in a new hole

near the old position. Place a washer under the head of each lag bolt. Countersinking for lag bolts is not

permitted.

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