Starrett 51459 Beveled Straight Edge 48 in Steel

Product Description

The STARRETT 51459 is a single-bevel straight edge used for layout, inspection, and surface verification work across machining, fabrication, and tool-and-die applications. Manufactured from steel, it measures 48 inches in length, 2-13/32 inches in width, and 7/32 inches in thickness. Edge flatness is held to 0.0008 inches, and parallelism is rated at 0.0016 inches. These tolerances make it suitable for checking straightness on machined surfaces, scribing layout lines, and verifying flatness on workpieces where precision is required. Machinists, toolmakers, and quality control technicians are the primary users of this tool.

The STARRETT 51459 is suited for use in machine shops, fabrication facilities, maintenance and repair operations, and metrology environments. The 48-inch working length accommodates larger workpieces and extended surface checks that shorter rules and parallels cannot span. The beveled edge design allows the working edge to sit close to the reference surface, improving contact and reducing error when checking gaps against a light source or using feeler gauges. This tool is typically deployed on surface plates, milling machine tables, and flat reference surfaces.

Key Features

• Edge flatness of 0.0008 inches for precision surface verification
• Parallelism held to 0.0016 inches
• Single beveled edge for close surface contact during inspection
• Steel construction for durability and dimensional stability
• 48-inch overall length suitable for large-format workpiece inspection
• Slim 7/32-inch thickness keeps weight manageable across the full length

Compatibility

Designed as a general-purpose precision straight edge for use in machine shop, fabrication, and inspection applications requiring a 48-inch beveled reference tool.

Installation Notes

Handle with care to avoid nicking or deforming the beveled edge, as edge damage will directly affect measurement accuracy. Store horizontally or hang vertically from the hang hole when not in use to prevent warping over time. Clean the working surface and the straight edge before use to remove chips, oils, or debris that could introduce measurement error. No power lockout is required for this hand tool, but follow shop safety procedures when working near powered machinery.