Starrett 56398 12 Inch Combination Square Set 2 Piece

Product Description

The STARRETT 56398 is a 2-piece combination square set built for layout, marking, and inspection work across a wide range of trade and fabrication applications. The set includes a 12-inch steel blade and a forged steel square head, delivering the rigidity and dimensional accuracy that machinists, pipefitters, ironworkers, and sheet metal mechanics depend on. The blade is graduated in the 16R style, offering four graduation increments: 1/32, 1/64, 1/100, and 1/50 inch. The forged steel head provides a secure, repeatable lock on the blade at any position along its length.

This combination square set is well suited for residential and commercial construction trades as well as light industrial and fabrication environments. Common applications include checking 90-degree and 45-degree angles, scribing lines parallel to an edge, measuring depth, and verifying flatness. The 12-inch blade length makes it practical for standard material stock encountered in HVAC ductwork layout, structural steel fitting, and general mechanical work. The set ships as a single package with a package quantity of one.

Key Features

• 12-inch steel blade with 16R graduation in 1/32, 1/64, 1/100, and 1/50 inch increments
• Forged steel square head for durability and accurate 90-degree and 45-degree reference
• Adjustable head slides and locks at any point along the blade length
• 2-piece set provides a complete layout solution in a single package
• Compact 1.125-pound weight keeps hand fatigue low during extended layout work

Compatibility

Designed as a standard 12-inch combination square set suitable for general layout and inspection tasks across metalworking, carpentry, and mechanical trades.

Installation Notes

No power source is required for use or storage of this tool. Before use in any energized panel or live electrical environment, confirm all circuits are de-energized per NFPA 70E guidelines. Keep the blade and head free of chips and debris to maintain graduation legibility and squareness accuracy. Periodically check that the head locking mechanism is fully tightened before taking a reference measurement.