screwdriver is a tool used for turning screws so as to drive them into
their place. It is a tool to insert and tighten or to loosen and remove
screws. It has a thin end, which enters the nick in the head of the
screw and with a mechanism to apply torque or force by rotating the
tip/end, the screw is inserted into its place. A screw driver is
basically a hand operated tool with a cylindrical handle of a size and
shape which can be easily held by a human hand, and there is an axial
shaft attached to the handle, the tip of which is shaped to fit a
specific type of screw. Screwdrivers are available in a variety of
shapes, and the tip of the driver can be rotated manually or by an
electric or other motor.
Size of drivers used in different size screws
The handles of the screwdrivers are either made of wood or plastic.
Top-quality handles made of wood have a bolster on the screwdriver bar
and this helps in holding the bar to the handle. The heavy-duty wooden
handles extend the entire length of the handle and are headed over with
a metal cap at the end . Plastic handles are made of fire and
heat-resistant materials and they give excellent grip. Rubber or vinyl
is sometimes used on plastic handles to serve as a non-slip or
Types of screwdrivers
Let us now get to know some of the popular screwdrivers , with their
uses and features in the following table:
Magnetized tip screwdrivers
Having crossed slots with a flat tip, they are used for tightening
and loosening Philips head screws and bolts.
These type of screwdrivers have thin slotted tip with straight sides
for driving counter bored screws, tightening and loosening slotted
screws and bolts. Popularly used in cabinet making.
(Slotted): The standard screwdrivers have single slotted tip
which is flared to the sides above the tip and used for tightening
and loosening slotted screws and bolts.
(Square Drive): Having squared flat tip, these are specially
designed for tightening and loosening Robertson screws and bolts.
(Torx®): Tightening and loosening star head screws and
bolts, they are designed to prevent strippings by having a more flat
contact surface with the screw head.
(Allen Head): For tightening and loosening recessed hexagonal
bolts, screws, the hex screwdrivers are used and they can be used in
place of Allen wrenches. They are mainly used in repair work in the
electronics field, for tightening socket-set screws.
Head: They are used for tightening and loosening clutch head
screws and bolts. They have four points of contact, lock into the
screw head when turned counterclockwise.
Driver: Available in varied sizes from 3/16" to ½",
they are used tightening and loosening hexagonal screws and bolts.
Claw: Having curved claw tips, they are used for pulling tacks
and small nails.
These screwdrivers are used for tightening and loosening screws in
tight spaces. They are available in many combinations.
Used for performing fine or precision work
Screwdriver: Having interchangeable bits, they rotate to turn
the screw when the handle is pushed.
Screwdriver: They are available in multi-piece sets having
interchangeable bits and sockets. With reversible ratcheting
handles, they help in driving screws and nuts much faster.
There are some other variety of screwdrivers which are very popular in
the market today. These are the magnetized tip screwdrivers. They have
magnetized tips, the blades can range from Philips to Hex and other
types and these are convenient when guiding screws to holes or otherwise
inaccessible areas. They can also be used to retrieve dropped screws and
Buying tips: Quality Indicators
There are several factors that help judge the quality of screwdrivers
- Blade Metal: If the kind of metal in the blade is poor
quality, it will chip and crumble under pressure.
- Amount of grinding on the tip: If the tip is improperly
ground and flares too much, it will rise out of the screw slot.
- Handle and bar attachment materials: The materials used
to make the handle and the bar attached to it also indicate the
quality of the screwdrivers. If the blade is not attached firmly to
the handle, it will eventually loosen and slip in the handle.
- Screwdriver Tips: Tips used on the screw drivers may be
of many kinds. Important kinds of tips are regular, cabinet,
Phillips, Frearson, Torx, clutch-head, hex, Bristol multi-spline and