- Thumbscrew (fastener)
A thumbscrew is a specialized type of
screw with either a tall head and ridged orknurl ed sides, or a flat, vertical head. They are intended to be tightened and loosened by hand. They are often cut for Phillips head or slotted screwdrivers as well.Sometimes a wingnut (a nut with two large metal wings so it can be tightened and loosened by hand without a
wrench ) is called a thumbscrew.ee also
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Computer case screws
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