Starrett 51444 Square Straight Edge 72 in Steel

Product Description

The STARRETT 51444 is a square straight edge designed for precision layout, inspection, and alignment work in industrial and trade environments. Machined from steel, this straight edge measures 72 inches in length, 3-5/32 inches in width, and 9/32 inches in thickness. Edge flatness is held to 0.0004 inches and parallelism to 0.0024 inches, making it suitable for applications where surface and edge accuracy are critical. Machinists, tool and die workers, fabricators, and quality control technicians rely on straight edges like this one to verify flatness, check alignments, and guide layout scribing on large workpieces and surface plates.

This straight edge is well suited for large-scale layout and inspection tasks in machine shops, fabrication facilities, and manufacturing environments. Its 72-inch span covers wide workpieces and structural components where a shorter reference tool would be inadequate. The square edge profile provides a consistent reference surface along both the face and the edge, supporting a range of measurement and marking tasks. It is also used to check the flatness of machine beds, weld fixtures, and other precision surfaces.

Key Features

• 72-inch overall length for wide-span layout and inspection coverage
• Edge flatness of 0.0004 inches for high-accuracy reference work
• Parallelism held to 0.0024 inches across the full length
• Square edge profile provides a reliable reference on both face and edge
• Steel construction for rigidity and long-term dimensional stability
• 3-5/32 inch width and 9/32 inch thickness provide a stable, low-deflection profile

Compatibility

Designed as an OEM-style precision reference tool for use on surface plates, machine beds, and large flat workpieces in industrial and fabrication settings.

Installation Notes

Handle with care to avoid nicks or burrs on the reference edges, as any damage will affect measurement accuracy. Store horizontally or hang vertically on a dedicated hook to prevent warping or bending over time. Clean the reference surfaces before use to remove chips, coolant, or debris that could introduce error. This tool does not require fastening or mounting but should be supported at appropriate points along its length when in use to minimize sag on large spans.