Spi 13-626-7 Spring Steel Square 4 Inch Blade

Product Description

The SPI 13-626-7 is a spring steel square designed for precision layout and inspection work in machining, fabrication, and toolroom environments. With a 4-inch blade length and a 3-inch base length, this tool is built to workshop grade specifications. Parallel accuracy is held to 0.0006 inches, and squareness accuracy is held to 0.0012 inches. Machinists, tool and die makers, and fabricators use this type of square for checking and marking right angles on workpieces, setting up fixtures, and verifying part geometry during production.

This square is suited for bench-level layout and inspection tasks in light manufacturing and job shop settings. The compact blade and base dimensions make it practical for smaller workpieces and confined work surfaces. Spring steel construction provides durability and resistance to flexing under normal shop use, helping maintain accuracy over repeated use cycles. It is appropriate for general workshop inspection where high-precision granite-plate metrology is not required.

Key Features

• 4-inch blade length for coverage on small to mid-size workpieces
• 3-inch base length for stable seating against reference surfaces
• Parallel accuracy of 0.0006 inches
• Squareness accuracy of 0.0012 inches
• Spring steel construction resists flex and wear under shop conditions
• Manufactured to workshop grade specifications

Compatibility

Designed as a general-purpose workshop square suitable for layout, inspection, and right-angle verification tasks in machining and fabrication applications.

Installation Notes

No installation is required for this hand tool. Prior to use, inspect the blade and base for burrs, nicks, or debris that could affect seating accuracy. Store in a dry environment to prevent corrosion, as spring steel can be susceptible to rust if left exposed to moisture. For critical tolerance work, verify the square periodically against a known reference surface.