Starrett 52515 Reversible Combination Square Protractor Head

Product Description

The STARRETT 52515 is a reversible protractor head designed for use with combination square blade sets. It mounts to standard combination square blades ranging from 12 to 24 inches in length, allowing the installer to orient the head in either direction along the blade for flexible layout and angle measurement work. Cast iron construction with a black smooth finish gives the head durability and resistance to wear in shop and field environments. This tool is used by machinists, pipefitters, sheet metal workers, and general tradespeople who need repeatable angle measurement integrated into a combination square setup.

The 52515 protractor head is suited for precision layout tasks in both shop and field settings. It is compatible with blades up to 24 inches, covering a range of applications from tight cabinet work to large-scale structural layout. The reversible design allows the head to be flipped without removing the blade, which saves time during repetitive layout sequences. Tradespeople working in HVAC duct fabrication, plumbing rough-in, and electrical conduit bending will find this type of angle measurement tool useful for accurate work.

Key Features

• Reversible head design allows orientation in either direction on the blade without removal
• Accepts combination square blades from 12 to 24 inches in length
• Cast iron construction provides durability under heavy shop and field use
• Black smooth finish reduces glare and resists surface wear
• Protractor head type enables direct angle measurement and layout transfers

Compatibility

Designed for use with standard combination square blades up to 24 inches in length. Verify blade groove and locking mechanism compatibility with existing blade sets before use.

Installation Notes

Installation requires sliding the protractor head onto a compatible combination square blade and securing the locking clamp. No special tools are required for mounting. Inspect the blade slot and locking screw for wear or debris before assembly to ensure a secure fit. Store the head protected from moisture to prevent corrosion of the cast iron body.