Spi 77-640-1 Square Straight Edge 12 Inches Spring Steel

Product Description

The SPI 77-640-1 is a square straight edge precision measuring tool used to verify flatness, check surface alignment, and identify irregularities across machined or ground surfaces. Manufactured from spring steel, it measures 12 inches in overall length, 1-13/32 inches wide, and 5/16 inches thick. Edge flatness is held to 0.0005 inches (12 micrometers), and parallelism is maintained at 0.0009 inches (24 micrometers). These tolerances make it suitable for precision layout, inspection, and quality control work in tool rooms, machine shops, and maintenance environments.

This straight edge is suited for trade professionals and technicians performing precision measurement and surface inspection. Typical applications include verifying flatness on machined components, checking alignment of mating surfaces, and supporting layout work on surface plates or workbenches. The 12-inch length covers a practical span for small to medium part inspection. Spring steel construction provides durability and resistance to deflection during repeated use.

Key Features

• Edge flatness of 0.0005 inches (12 micrometers) for precision inspection work
• Parallelism held to 0.0009 inches (24 micrometers)
• Spring steel construction for durability and resistance to wear
• Square edge type for reliable contact along the measuring edge
• Compact 12-inch length suitable for small to medium component inspection
• Package quantity of 1 with a minimum order quantity of 1

Compatibility

Designed as a general-purpose precision straight edge for use in machine shops, tool rooms, and industrial maintenance applications where surface flatness and alignment verification are required.

Installation Notes

Straight edges are handled and stored carefully to prevent edge damage that would compromise measurement accuracy. Keep the tool clean and dry, and store it in its protective case when not in use. Always clean the reference surface and the straight edge before use to remove debris that could introduce measurement error. Do not use the straight edge as a cutting guide or apply lateral force that could bend or distort the blade.