These small L-shaped wrenches fit Allen screws, those with hexagonal recesses in their
heads. They may also be used on set screws, a type of headless screw that is used in metal
work, and often has a hexagonal recess in the top.
Either end of the Allen wrench fits inside the screw. If space is limited, such as when
the set screw is inside a deep opening, use the long end of the wrench. When greater torque
is needed, use the shorter end.
Purchasing
You can commonly find these wrenches - singly or in sets - in standard and metric sizes up
to 3/8 inch.
Other Names
Hex wrench, hex-key wrench, set-screw wrench
Substitutes
An alternative to the Allen wrench is a T-handle hex-key wrench. The perpendicular handle
of this wrench increases leverage and torque when you're tightening and loosening Allen
screws. A vinyl covering on the handle provides a comfortable grip. You can buy this tool
singly or in a set of various wrenches with a stand.
Another alternative is the folding hex-key wrench. A set of folding hex keys fits into
a case much the way that blades fit into a pocketknife case. A spring bar or knurled
knob holds each key open. The case keeps the set together and protects it from damage.
This tool usually contains seven, eight, or nine hex keys of varying sizes, in either
standard or metric measurements.
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