USE/CARE OF HANDTOOLS & MEASURING TOOLS - OD1621 - LESSON 2/TASK 1
blade is anchored in the handle by two or more tongs on the end of the blade
and, in the case of a wood handle, the blade is anchored by a pin or rivet
through the ferrule, handle, and blade. Some handles are integral; that is,
the blade forms an integral part of some of the outside surface of the
handle and is locked in place by rivets. Integral blade screwdrivers are
used for heavy-duty work. The blade can be tapped with a hammer to seat the
blade tip in rusty screws. Other common heavy-duty screwdrivers have square
blades so that a wrench can be used to turn them.
FIGURE 8.
COMMON FLAT-TIP SCREWDRIVER.
(3) Phillips Screwdrivers (Cross-Tip).
The tip of a Phillips
screwdriver (figure 9 on the following page) is shaped like a cross so that
it fits into Phillips-head screws.
Phillips-head screws have two slots
which cross at the center. These screwdrivers are made with four different
sized tips. Size 1 will fit No. 4 and smaller size Phillips screws; size 2
will fit Nos. 5 to 9 inclusive; size 3 will fit Nos. 10 to 16 inclusive; and
size 4 will fit No. 18 and larger size Phillips-head screws.
Phillips
screwdrivers also have different length blades ranging from 1 inch to 8
inches.
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