Spi 77-645-0 Square Straight Edge 60 in Spring Steel

Product Description

The SPI 77-645-0 is a square straight edge measuring 60 inches in overall length, designed for precision layout, inspection, and reference work in machine shops, fabrication facilities, and manufacturing environments. Constructed from spring steel, it delivers consistent rigidity and resistance to flex across its full span. Edge flatness is held to 0.0011 inches (29 micrometers), and parallelism is maintained at 0.0020 inches (58 micrometers), making it suitable for demanding surface and alignment verification tasks. Machinists, tool and die makers, and quality control technicians are the primary users of this type of precision straight edge.

This straight edge is suited for both bench and floor-level inspection applications where a long reference surface is required. At 60 inches in length, it covers large workpieces, weldments, machine beds, and structural components that shorter straight edges cannot span. The 2-3/4 inch width and 3/8 inch thickness provide a stable cross-section that resists bowing during use. It is a single-piece reference tool requiring no assembly and is packaged individually.

Key Features

• 60-inch overall length spans large workpieces and machine beds
• Edge flatness of 0.0011 inches (29 micrometers) for precise reference measurement
• Parallelism of 0.0020 inches (58 micrometers) between edges
• Spring steel construction for rigidity and long-term dimensional stability
• Square edge type for direct contact layout and inspection use
• Single-piece construction with no assembly required

Compatibility

Designed as a general-purpose precision straight edge reference tool for use in machine shop, fabrication, and industrial inspection environments where a 60-inch spring steel straight edge is required.

Installation Notes

Handle precision straight edges with clean, dry hands or appropriate gloves to prevent surface corrosion from skin oils. Store horizontally or vertically on a stable support to prevent warping over time. When using for surface verification, ensure the reference surface is clean and free of chips or debris before contact. Calibration intervals should follow the facility quality management system requirements.