Starrett 51458 Beveled Straight Edge 36 in Steel

Product Description

The STARRETT 51458 is a single-bevel straight edge machined from steel and used as a precision layout and inspection reference tool. It measures 36 inches long, 2-13/32 inches wide, and 7/32 inches thick. The working edge is ground to a flatness tolerance of 0.0004 inches, with a parallelism tolerance of 0.0012 inches between the two long edges. These tolerances make it suitable for verifying surface flatness, scribing layout lines, and checking machined or ground surfaces in precision fabrication environments. Machinists, toolmakers, and metrology technicians are the primary users of this tool.

The 51458 is used in machine shops, tool rooms, and fabrication facilities where accurate layout and surface inspection are required. Its 36-inch length makes it appropriate for medium to large workpieces where a shorter rule or straightedge would not span the full inspection area. The beveled edge reduces parallax error when scribing lines and provides a defined, repeatable reference contact line. It is suitable for use on surface plates, machine tables, and precision-ground castings.

Key Features

• Single beveled edge ground to 0.0004 inches flatness tolerance
• Parallelism tolerance of 0.0012 inches between long edges
• 36 inches overall length for spanning medium to large workpiece surfaces
• Steel construction for durability and dimensional stability
• 7/32 inches thickness provides rigidity with low profile
• Bevel design reduces parallax error during layout scribing

Compatibility

Designed as a general-purpose precision straight edge for use in machine shop layout and inspection applications requiring a 36-inch steel reference edge.

Installation Notes

No installation is required for this tool. Handle the beveled edge with care to avoid nicks or burrs that would compromise flatness accuracy. Clean the working surface and the straight edge before use to prevent debris from introducing measurement error. Store flat or hung vertically to prevent warping over time.