Starrett 56377 Combination Square Set 24 Inches 3 Piece

Product Description

The STARRETT 56377 is a 3-piece combination square set built around a 24-inch hardened steel blade. It includes both a square head and a center head, giving layout technicians, pipefitters, and precision fabricators the flexibility to perform 90-degree and 45-degree squaring as well as center-finding operations in a single kit. The blade is graduated in 16R style, covering 1/32, 1/64, 1/50, and 1/100 inch increments, which supports fine layout work across both fractional and decimal measurement systems. The cast iron heads provide durable, stable seating on the blade throughout repeated jobsite use.

This combination square set is suited for residential and commercial fabrication, mechanical, and plumbing layout work wherever accurate scribe lines, shoulder transfers, or center marks are required. It is commonly used on flat stock, pipe, and structural profiles in shop and field settings. Machinists, pipefitters, millwrights, and sheet metal workers rely on this type of set for everyday layout and inspection tasks.

Key Features

• 24-inch hardened steel blade with 16R graduation in 1/32, 1/64, 1/50, and 1/100 inch increments
• Includes both square head and center head for 90-degree, 45-degree, and center-finding layout
• Cast iron heads resist wear and maintain accurate seating on the blade
• Dual-system graduation supports fractional and decimal layout workflows
• 3-piece set ships as a complete kit — no additional heads required for standard layout tasks

Compatibility

Designed as a general-purpose combination square set compatible with standard layout and inspection workflows requiring a 24-inch blade with 16R graduation.

Installation Notes

No power source or lockout procedure is required for hand layout tools. Before use, verify that the head lock screws are fully tightened and that the head seating faces are clean and free of chips or burrs that could affect square accuracy. Periodically check blade graduation alignment against a known reference if the set will be used for precision inspection. Handle cast iron heads carefully to avoid cracking from sharp impacts.