Starrett 50579 Adjustable Parallel 1/2 to 11/16 in

Product Description

The STARRETT 50579 is a precision adjustable parallel designed for use in layout, inspection, and machine setup work. It spans a minimum measurement of 0.5 inches (12.70 mm) to a maximum of 0.6875 inches (17.50 mm), giving machinists and tool-and-die workers a compact, accurate reference for setting gaps, checking clearances, and supporting workpieces during measurement. The body is 2.125 inches long and 0.28125 inches (9/32 inches) thick. Constructed from steel, this parallel is sized for close-tolerance applications where a standard fixed parallel would not fit the required range.

Adjustable parallels like the 50579 are commonly used in machine shops, tool rooms, and precision manufacturing environments. They are well suited for bridging slots, setting up milling vises, and supporting parts during surface plate inspection. The compact size makes this parallel practical for small-bore and tight-clearance situations where larger tooling cannot be positioned. Licensed machinists, toolmakers, and metrology technicians are the primary installers and users of this type of precision hand tool.

Key Features

• Adjustable range from 0.5 inches to 0.6875 inches for versatile fitment in varying gap widths
• Steel construction for durability and dimensional stability under shop conditions
• 2.125 inches overall length suitable for small-bore and tight-clearance applications
• 9/32 inch (0.28125 inch) thickness provides a low-profile cross-section for confined spaces
• Single-piece package with a minimum order quantity of 1 for individual purchase flexibility

Compatibility

Designed as a general-purpose adjustable parallel for use in machine shop layout, vise setup, and surface plate inspection work across a range of precision manufacturing and metrology applications.

Installation Notes

Adjustable parallels are hand-positioned tools used by machinists and toolmakers during setup and inspection — no power source or wiring is required. Before use, ensure mating surfaces and the parallel body are clean and free of chips or burrs that could affect measurement accuracy. Adjust the parallel to the required span and lock it securely before taking a reading or using it as a support reference. Handle with care to prevent nicking the precision ground surfaces.