Starrett 50108 Combination Square Protractor Head

Product Description

The STARRETT 50108 is a protractor head designed for use with combination square blade sets ranging from 12 to 24 inches in length. Cast iron construction gives the head durability and dimensional stability under repeated shop use. The body features a black wrinkle finish with chrome detailing on the turret. This head is used by machinists, tool and die makers, layout technicians, and precision metalworkers who require accurate angular measurement and layout work on machined or fabricated components.

The 50108 is suited for layout and inspection tasks in machine shops, manufacturing facilities, and toolrooms. It pairs with combination square blades up to 24 inches long, making it appropriate for both standard and extended-reach measurement applications. The protractor head allows angular measurement and transfer, supporting tasks such as checking bevel angles, scribing layout lines at set angles, and verifying part geometry during fabrication or quality control.

Key Features

• Accepts combination square blades from 12 to 24 inches in length
• Protractor head design for angular measurement and layout
• Cast iron construction for rigidity and long service life
• Black wrinkle body finish with chrome on turret for corrosion resistance
• Non-reversible head configuration

Compatibility

Designed for use with combination square blades with a maximum length of 24 inches. Verify blade groove and locking mechanism dimensions match before pairing with blades from third-party manufacturers.

Installation Notes

Installation is performed by machinists or layout technicians as part of assembling a combination square set. Ensure the blade is fully seated and the locking nut is secure before taking measurements. Inspect the blade groove and locking mechanism for debris or burrs that could affect seating and reading accuracy. No power source is required for this mechanical tool.