Set Screws are often used for holding a pulley, gear, or other parts from turning relative to a shaft.

Alloy Steel is steel that has been alloyed with other materials to improve overall physical properties. 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). Tensile strength ranges for the alloys typically used in these fasteners range from 170,000 to 180,000 psi (pounds per square inch), making these amongst the strongest of materials. Zinc Plating helps to prevent corrosion.

Hex socket drive systems are driven by hex wrenches or power tools with hexagonal bits. Cup Point is the most common point type, with good holding capability.

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.

• Set Screws keep parts from turning relative to a shaft
• Zinc Plated Steel fasteners are suitable where strength and corrosion resistance are primary considerations
• Do not have an external head
• Drive system is a hexagon-shaped hole
• Coarse threads are better for brittle materials, and will assemble and disassemble more quickly than fine threads

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