Starrett 50045 Combination Square Set 24 Inch 4 Piece

Product Description

The STARRETT 50045 is a 4-piece combination square set built around a 24-inch steel blade with a 4R graduation pattern. The 4R system provides four graduation increments on a single blade: 1/64 inch, 1/32 inch, 1/16 inch, and 1/8 inch. The set includes a square head, a protractor head, and a center head, all cast from iron for rigidity and long service life. This set is suited to layout, inspection, and fabrication work performed by machinists, pipefitters, millwrights, and other trade professionals who require precise angular and linear measurement across a range of tasks.

The 50045 is used in both shop and field environments where a single versatile layout tool replaces multiple individual squares and protractors. The included center head makes it practical for locating the center of round stock, while the protractor head handles angle layout and transfer. The square head serves standard 90-degree and 45-degree reference work. This set is appropriate for general industrial use, mechanical trades, and fabrication shops where consistent measurement accuracy is required across multiple head configurations.

Key Features

• 24-inch hardened steel blade with 4R graduation (1/64, 1/32, 1/16, and 1/8 inch increments)
• Four measurement graduations on a single blade reduce the need for multiple layout tools
• Cast iron square head, protractor head, and center head included for versatile layout work
• Center head enables fast centerline location on cylindrical or round stock
• Protractor head supports direct angle measurement and transfer
• Complete 4-piece set ships as a single package quantity

Compatibility

Designed as an OEM-style combination square set suitable for general mechanical, fabrication, and inspection applications where a 24-inch 4R-graduated blade and multi-head configuration are required.

Installation Notes

Combination squares require no power source or hardwired installation. Before use, verify that the blade locks securely in each head and that all locking mechanisms are fully tightened to prevent blade movement during measurement. Keep the blade and head contact surfaces clean and free of debris to maintain accurate reference. Periodic inspection of the blade for nicks or burrs along the graduation markings is recommended to ensure consistent reading accuracy.