what screw must not be used or must be discarded
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what screw must not be used or must be discarded
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Answer:
Wrenches are made in various shapes and sizes and are used for gripping, fastening, turning, tightening and loosening things like pipes, pipe fittings, nuts and bolts. There are basically two major kinds of wrenches:
Pipe wrenches used in plumbing for gripping round (cylindrical) things.
General use wrenches used on nuts and bolts that have flat, parallel surfaces; e.g., square or hexagonal (hex).
Wrenches may be adjustable to fit different sized pipes, nuts and bolts or may be a fixed size.
What are some examples of adjustable wrenches?
Adjustable wrenches include:
Pipe wrenches.
Crescent (TM) wrenches which have adjustable jaws set at a 30-degree angle from the handle. Although Crescent is a trade name, it is widely used to refer to any regular adjustable wrench with an angled jaw regardless of who manufactured it.
Monkey wrenches which have their adjustable head at a 90-degree angle from the handle.
What are some examples of fixed-size wrenches?
Fixed-sized wrenches include:
Open ended wrenches that have "jaws" with parallel sides or tines that fit snugly on nuts and bolts.
Closed end or box wrenches that have a loop at the end with notches on the inside that allow the wrench to fit either square or hex nuts or both (depending on the number of notches or points).
Combination wrenches that have both an open end and a closed end on either end of the wrench; usually they fit the same size nut or bolt.
Socket wrenches are similar to closed end wrenches except they are cylindrical in shape. They can fit over a nut in a recessed hole that would be inaccessible with open or closed ended wrenches. These wrenches have an offset handle at right angles to the nut being tightened or loosened. Usually the handle is a ratchet-type handle that allows the user to turn the socket continuously in one direction by moving the handle back and forth without having to take the socket off the nut.
Torque wrenches, one type of socket wrenches, have a built-in spring-loaded indicator that shows how much torque being is being applied (i.e., shows how hard the nut is being tightened).
Nut drivers, another type of socket wrenches, are sockets that can be snapped on or permanently fixed to a screwdriver-type handle.
Allen wrenches or Allen keys are hexagon-shaped (six-sided) metal shafts that are bent into an L-shape for leverage. Hex drivers are "straight Allen wrenches" that have a screwdriver-type handle. These are different from the other wrenches since they fit inside a recessed hexagonal hole in screw heads instead of around a nut or bolt.
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