Thumb Screws are used almost exclusively for the purpose of simplicity. However, they are also ideal for applications in which space is too restricted to allow enough clearance for the use of tools to fasten the screw.
Designers might choose thumbscrews for household, electronic and other consumer products, not just for the ease of fastening but also to avoid the risk of over-tightening. They are particularly beneficial for assemblies that require repeated removal and reinstallation.
When used for removal-and-reinstallation applications, such as safety covers or access panels, thumb screws can reduce the amount of time required for maintenance or inspection. Their hand-adjustment design also reduces the incidence of broken or stripped fasteners that might occur with frequent removal and reinstallation.
Thumb screws are not recommended for structural applications or high-vibration environments, such as automotive, railway or marine vehicles, where cyclical loading might cause them to become loose over time.
Fastener length and thread size varies considerably, and many thumbscrews are also available in metric sizes. The length is measured from under the head to the tip of the screw. Materials include brass, nylon, steel, stainless steel, aluminum and plastic. For consumer products, designers might choose a particular material based on its aesthetic appeal.
Thumb screws, knurled thumb screws, Knob screw
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