Starrett 56406 Combination Square Set 24 Inch 2 Piece

Product Description

The STARRETT 56406 is a 2-piece combination square set built for layout, inspection, and transfer work across trade and industrial applications. The set includes a 24-inch hardened steel blade and a forged steel square head. The blade is graduated in 16R style, providing four graduation increments: 1/32, 1/64, 1/100, and 1/50 inch, giving technicians and tradespeople precise reference marks for a wide range of measuring tasks. At 1.875 pounds, the assembly is substantial enough for stable use without being cumbersome on the job. This tool is suited for HVAC fabrication, pipefitting layout, electrical rough-in, and general sheet metal or structural work.

The 56406 is appropriate for both residential and light commercial trade environments where accurate 90-degree and 45-degree layout lines are required. The forged steel square head locks onto the blade at any position, allowing the user to scribe lines, check squareness, and measure depth or height from a reference surface. It is commonly used during equipment installation, ductwork fabrication, and structural layout where consistent, repeatable measurements are critical to code-compliant work.

Key Features

• 24-inch steel blade with 16R graduation style (1/32, 1/64, 1/100, and 1/50 inch increments)
• Forged steel square head for durability and consistent clamping force
• Adjustable head positions anywhere along the full 24-inch blade length
• 2-piece set includes blade and square head for immediate use out of the box
• 1.875-pound total weight provides stability during layout and scribing tasks

Compatibility

Designed as a general-purpose combination square set compatible with standard trade layout and inspection tasks. No specific system or equipment compatibility is stated in the product data.

Installation Notes

Combination squares require no installation but should be verified for calibration before use on critical layout work. Inspect the blade and head for burrs or damage that could affect squareness readings. Store the set protected from impacts that could alter blade straightness or head seating. This tool is typically used by HVAC technicians, pipefitters, electricians, and sheet metal workers during rough-in and fabrication stages.