Starrett 51547 Combination Square Set 24 in 4 Piece

Product Description

The STARRETT 51547 is a 4-piece combination square set built for precise layout, measurement, and angle work in the field or on the bench. The set includes a 24-inch steel blade graduated in 16R style, covering 1/32, 1/64, 1/100, and 1/50-inch increments for versatile reference across common trade applications. The set ships with three head types: a square head, a center head, and a protractor head, all forged steel construction. Licensed trades including HVAC installers, pipefitters, electricians, and plumbers rely on combination squares for scribing, squaring, and checking angles during rough-in and finish work. The 24-inch blade length suits large-scale layout tasks that shorter 12-inch sets cannot handle.

This combination square set is suited for residential and commercial trade work where accurate layout and angle transfer are required. The 16R graduation provides four reading scales on a single blade, reducing the need to swap tools when switching between fractional and decimal inch measurements. The center head allows for quick centering on round stock, while the protractor head enables direct angle measurement and transfer. This set fits naturally into a tool kit used by sheet metal workers, mechanical contractors, and general construction tradespeople who need reliable precision measuring equipment on a variety of job types.

Key Features

• 24-inch steel blade with 16R graduation in 1/32, 1/64, 1/100, and 1/50-inch increments
• 4-piece set includes square head, center head, and protractor head plus blade
• Heads constructed from forged steel for durability under job-site conditions
• Multiple graduation scales on a single blade reduce tool changeover
• Center head simplifies finding center on cylindrical or round stock
• Protractor head allows direct angle measurement and transfer without a separate tool

Compatibility

Designed as a standard combination square set for trade and industrial layout applications where a 24-inch blade with multi-scale 16R graduation is required.

Installation Notes

Combination squares are hand-measurement tools and do not require installation. Before use, verify that each head locks securely on the blade and that the blade slides freely without play. Store the set in a dry environment to prevent corrosion on the steel blade and forged heads. Periodically check the square head against a known reference surface to confirm calibration has not shifted from job-site handling.