Starrett 51456 Beveled Straight Edge 18 in Steel

Product Description

The STARRETT 51456 is a single-bevel straight edge designed for precision layout, inspection, and surface verification work. Machined from steel, it measures 18 inches long, 1-13/32 inches wide, and 11/64 inches thick. The beveled working edge is ground to a flatness tolerance of 0.0004 inches, with a parallelism tolerance of 0.0006 inches across the length. These tolerances make it suitable for demanding layout tasks where a reliable reference edge is required. Machinists, tool and die makers, and quality technicians typically reach for this type of straight edge when checking surface flatness, scribing lines, or verifying machined workpiece geometry.

This straight edge is appropriate for use on machine shop floors, toolrooms, fabrication benches, and inspection stations. Its compact profile and single-bevel design make it easy to handle during layout operations on flat stock, castings, and machined components. The steel construction provides durability in shop environments where contact with workpiece surfaces and layout dye is routine. It is sized for work requiring an 18-inch reference length without the bulk of a longer precision rule or surface plate accessory.

Key Features

• Single beveled edge ground to 0.0004 inches flatness tolerance
• Parallelism tolerance of 0.0006 inches across full length
• Steel construction for shop durability and dimensional stability
• 18-inch working length suits a wide range of layout and inspection tasks
• Slim profile at 11/64 inches thick for easy positioning against workpieces

Compatibility

Designed as a general-purpose precision straight edge for use in machine shop, toolroom, and inspection applications requiring an 18-inch steel reference edge.

Installation Notes

No permanent installation is required. Clean the working surface and the straight edge contact face before use to prevent debris from introducing measurement error. Handle with care to avoid dropping or impacting the beveled edge, as damage to the ground surface will compromise flatness accuracy. Periodic inspection against a known reference surface is recommended to confirm the edge remains within tolerance.