Starrett 50042 12 Inch 4-piece Combination Square Set

Product Description

The STARRETT 50042 is a 4-piece combination square set built for precision layout and measurement work on job sites and in fabrication shops. The set includes a 12-inch hardened steel blade, a square head, a center head, and a protractor head, giving technicians and tradespeople a versatile tool for checking squareness, finding center, and measuring angles in a single kit. The blade is graduated in the 4R style, providing four graduation increments: 1/64, 1/32, 1/16, and 1/8 inch. Cast iron heads deliver the rigidity and stability required for repeatable, accurate readings across demanding trade applications.

This combination square set suits a wide range of trade and shop applications including HVAC fabrication, pipefitting layout, electrical enclosure work, and general metalwork. It is equally at home on a machine shop bench or a mechanical contractor's work table. The three interchangeable heads allow a single blade to serve multiple measurement functions without switching tools, making it a practical addition to any professional tool kit where layout accuracy is critical.

Key Features

• 12-inch hardened steel blade with 4R graduation (1/64, 1/32, 1/16, and 1/8 inch increments)
• Three head types included: square head, center head, and protractor head
• Cast iron head construction for durability and dimensional stability
• Interchangeable heads slide and lock on a single blade for versatile use
• 4-piece set ships as a complete kit — no additional heads required

Compatibility

Designed as a general-purpose combination square set compatible with standard layout and measurement tasks across metalworking, fabrication, and mechanical trade applications.

Installation Notes

Combination square sets require no installation but should be inspected for blade straightness and head lock tightness before use. When using the protractor head for angle layout, verify the locking nut is fully seated to prevent slippage during scribing. Keep the blade clean and lightly oiled to prevent corrosion and ensure smooth head movement. Store in a protective case or roll to avoid blade warping or graduation wear.