Starrett 56393 Combination Square Set 6 Inch 3 Piece

Product Description

The STARRETT 56393 is a 3-piece combination square set built for layout, measurement, and inspection work in the field or shop. The set includes a 6-inch steel blade and two interchangeable heads: a standard square head and a center square head, both forged steel construction. The blade is graduated in 4R style, providing four graduation increments — 1/64, 1/32, 1/16, and 1/8 inches — on a single blade for versatile measurement reference. The forged steel heads deliver the rigidity and repeatability that professional tradespeople and machinists expect from a precision layout tool.

This combination square set suits residential and commercial trade applications wherever accurate layout or transfer measurements are required. HVAC technicians, pipefitters, electricians, and general contractors use combination squares for scribing lines, checking 90-degree and 45-degree angles, setting depths, and locating center points on round stock. The center square head makes it straightforward to find the center of cylindrical material, a common task during mechanical and fabrication work. The compact 6-inch blade length is well suited to tight spaces and bench work.

Key Features

• 3-piece set includes steel blade, square head, and center square head
• 6-inch blade length with 4R graduation (1/64, 1/32, 1/16, and 1/8 inch increments)
• Forged steel heads for durability and dimensional stability
• Center square head for locating centers on round or cylindrical stock
• Interchangeable heads allow the blade to serve multiple layout functions

Compatibility

Designed as a standard 6-inch combination square set compatible with typical combination square accessories and replacement blades sized for that format.

Installation Notes

Combination squares are hand-layout tools that require no installation. Handle the blade and heads with care to avoid nicks or burrs that can affect measurement accuracy. Store the set in a dry environment to prevent corrosion on the steel blade and forged heads. Periodically check the head lock mechanism for secure clamping before use to ensure repeatable readings.