Starrett 50057 Combination Square Set 12 Inches 2 Piece

Product Description

The STARRETT 50057 is a 2-piece combination square set built for layout, scribing, and angle verification in trade and shop environments. The set includes a 12-inch hardened steel blade and a cast iron square head graduated in the 16R style, which provides four graduation scales: 1/32, 1/64, 1/50, and 1/100 inch. The steel blade resists flex during measurement transfers, and the cast iron head provides the mass and rigidity needed for accurate 90-degree and 45-degree reference checks. Machinists, pipefitters, ironworkers, and fabricators reach for this set when layout precision directly affects fit and assembly quality.

This combination square set is suited to both shop and field use wherever flat, square, or mitered layout work is required. Common applications include marking cut lines on structural steel, verifying squareness of framing members, setting saw fences, and scribing parallel lines. The 16R graduation format is a standard reference in precision layout, making this set appropriate for industrial fabrication, mechanical maintenance, and general trade work requiring blade-and-head combination tools.

Key Features

• 12-inch steel blade with 16R graduation in 1/32, 1/64, 1/50, and 1/100 inch increments
• Cast iron square head delivers stable 90-degree and 45-degree reference surfaces
• 2-piece set includes blade and square head for versatile layout tasks
• 16R graduation style provides four scales on a single blade for multi-resolution measurement
• Steel blade construction resists bending and wear during repeated use

Compatibility

Designed as a standard 12-inch combination square set compatible with typical combination square accessory heads and replacement blades that accept the 16R graduation format.

Installation Notes

No power source or utility shutdown is required for combination square use. Keep the blade lock mechanism tight before scribing or transferring measurements to prevent blade shift. Inspect the head seating surface and blade for burrs or debris before use, as surface contamination directly affects measurement accuracy. Store the set protected from moisture to prevent rust on the steel blade and cast iron head.