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ForSale Zinc Plated Steel Thumb Screw, Spade Head without Shoulder, 5/16″-18, 1″ Length (Pack of 50)

Thumb screws are designed to be tightened and loosened by hand. They come in a variety of head styles, but each includes an easy-grip head which allows for simple “by-hand” installation.

Steels are designated by a 4 number SAE Steel grade.  The first two digits indicate the primary materials used to form the steel.  The last 2 digits identify the percentage of carbon for the alloy (in hundredths).  The steel used in these fasteners has a tensile strength ranging from 100,000 to 150,000 psi (pounds per square inch).  Zinc Plating helps to prevent corrosion.

Spade head styles are perfect when frequent adjustments are necessary. They have a wide head which allows for easy tightening and loosening by hand.

A threaded fastener’s size name includes information about the major external diameter, followed by the threads per inch, which indicates if it is coarse or fine. Coarse threads are better when working with brittle materials; they are sturdier and are easier to thread and unthread compared to fine. Coarse threading also allows for thicker coatings and platings. Thumb Screws allow for simple “by-hand” installation Zinc Plated Steel fasteners are suitable where strength and corrosion resistance are primary considerations Spade head is easy to grasp Tools not necessary for tightening or loosening Coarse threads are better for brittle materials, and will assemble and disassemble more quickly than fine threads

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