Starrett 64601 Reversible Combo Square Protractor Head

Product Description

The STARRETT 64601 is a reversible combination square protractor head designed for use with combination square blades up to 24 inches in length. The head features a cast iron body with a black wrinkle finish and chrome-coated turret, providing durability and corrosion resistance in demanding shop and field environments. The reversible design allows the head to be flipped and repositioned on the blade, extending its versatility across layout, angle measurement, and inspection tasks. Machinists, tool and die makers, pipefitters, and precision layout tradespeople use this head as a core component of a combination square setup. It weighs 1.95 pounds and ships as a single unit.

This protractor head is suited for precision measurement and layout work in metalworking, fabrication, and industrial maintenance applications. The head mounts to a standard combination square blade and allows angle measurement as well as reversible positioning for left- or right-hand use. It is appropriate for both bench work and on-site layout tasks where accurate angular reference is required. The cast iron construction handles the wear and contact demands of regular shop use without dimensional drift over time.

Key Features

• Reversible head design for flexible left- or right-hand blade orientation
• Accepts blades up to 24 inches in length
• Cast iron body for rigidity and long-term dimensional stability
• Black wrinkle finish with chrome-coated turret for corrosion resistance
• Compatible with standard combination square blade sets

Compatibility

Designed as an OEM-style replacement or standalone protractor head for use with standard combination square blades up to 24 inches in length.

Installation Notes

Installation is performed by machinists or precision layout tradespeople and requires no special tools beyond the locking hardware integrated into the head. Ensure the blade channel and locking mechanism are free of debris before seating the blade. Do not overtighten the locking nut, as this can distort the blade channel and affect measurement accuracy. Inspect the head for burrs or casting irregularities before first use.