Starrett 50107 Combination Square Protractor Head

Product Description

The STARRETT 50107 is a protractor head designed for use with combination square blade sets. Cast iron construction with a black wrinkle coat finish, this head attaches to combination square blades ranging up to 24 inches in length. It provides angular measurement capability when paired with a compatible blade, making it a standard layout and inspection tool used by machinists, pipefitters, sheet metal workers, and other trades requiring precise angle work on the job or at the bench.

The 50107 protractor head fits into combination square setups used across fabrication, layout, and inspection tasks. It is suited for both shop and field use in applications where angular measurements need to be transferred, verified, or marked. The head is non-reversible and is rated for blades up to 24 inches, accommodating blade lengths from 12 to 24 inches depending on the set configuration.

Key Features

• Cast iron body with black wrinkle coat finish for durability and corrosion resistance
• Accepts combination square blades up to 24 inches in length
• Protractor head configuration for angular layout and measurement
• Non-reversible head design
• Compatible blade length range: 12 to 24 inches

Compatibility

Designed as a replacement or supplemental protractor head for combination square sets accepting blades from 12 to 24 inches. Confirm blade slot and locking mechanism match before installation.

Installation Notes

Installation of a combination square protractor head requires no special tools beyond the blade and locking screw included with or matched to the set. Ensure the blade is clean and free of burrs before seating it in the head to maintain measurement accuracy. Do not overtighten the locking screw, as this can damage the blade groove or distort the head seating surface. Verify squareness and angular calibration after assembly before use in precision layout work.