Starrett 50581 Adjustable Parallel 15/16 to 1-5/16 in

Product Description

The STARRETT 50581 is a steel adjustable parallel used in precision machining and layout work to support and align workpieces on mill tables, surface plates, and drill press setups. It adjusts from 15/16 inch to 1-5/16 inches, covering a 0.375-inch range, and measures 3.5625 inches long by 0.28125 inches thick. The all-steel construction holds its set position under clamping pressure, keeping workpieces stable during milling, drilling, or inspection. Machinists, toolmakers, and precision fabricators use adjustable parallels as matched pairs or singles to achieve consistent, repeatable part support at a chosen height.

This parallel is suited for general-purpose machine shop use in both jobbing and production environments. It is sized for smaller setups where the required support height falls within the 15/16 to 1-5/16 inch range. Typical applications include leveling workpieces in vises, supporting castings on surface plates, and establishing reference planes for layout or inspection. The 9/32-inch thickness keeps the body low-profile so it fits standard vise and fixture clearances without interference.

Key Features

• Adjustable range from 15/16 inch to 1-5/16 inches for versatile height support
• All-steel construction resists deflection under clamping loads
• 3-9/16 inch body length provides stable, distributed contact across the workpiece
• 9/32 inch thickness fits standard vise and fixture clearances
• Compact size suits smaller precision setups and tight spaces

Compatibility

Designed as a standard adjustable parallel for general machine shop, toolroom, and inspection applications where a support height between 15/16 and 1-5/16 inches is required.

Installation Notes

Adjustable parallels are set and used by machinists and toolmakers; no power source is involved, but all machine power should be off and the spindle stopped before placing or adjusting parallels under a workpiece. Set the parallel to the desired height before clamping the workpiece, and verify it is fully seated and not rocking before beginning the operation. Do not use parallels as striking tools or pry devices, as this can damage the precision ground surfaces.