a. Stove Bolts. Stove bolts are used mostly with small items of
hardware. Roundhead or flathead stove bolts (Figure 146) range in
length from 3/8 to 6 inches. They are used in light construction.
b. Machine Bolts. Machine bolts (Figure 147) are used in
woodwork. They usually have square heads and square nuts. A metal
washer is usually used under both the head and the nut. These
washers prevent the head from embedding into the wood and keep the
nut from tearing the wood fibers as it is turned. Two wrenches are
required when tightening machine bolts.
c. Carriage Bolts. Carriage bolts are like machine bolts
except for the heads, which are round (Figure 148). The
shank of the carriage bolt has a square portion, which