Starrett 52525 Reversible Combination Square Protractor Head

Product Description

The STARRETT 52525 is a reversible combination square protractor head designed to work with blades from 12 to 24 inches in length. Cast iron construction with a black wrinkle coating gives it durability in shop and jobsite environments. The protractor head allows angular measurement and layout work across a wide range of trades, including pipefitting, sheet metal fabrication, carpentry, and general metalworking. The reversible design adds flexibility when transferring or scribing angles from either face of the head, reducing setup time during precision layout tasks.

This protractor head fits into combination square sets where angle measurement is required alongside standard squaring and depth functions. It is suited for use in fabrication shops, maintenance facilities, and field installations where layout accuracy matters. Machinists, pipefitters, millwrights, and sheet metal workers are the primary users. The head accepts blades up to 24 inches, making it appropriate for larger workpieces that require extended reach during layout.

Key Features

• Reversible head design allows measurement and layout from either face
• Compatible with blades from 12 to 24 inches in length
• Cast iron body provides rigidity and resistance to jobsite wear
• Black wrinkle coating reduces glare and resists corrosion
• Protractor head configuration enables angular layout and transfer work

Compatibility

Designed as an OEM-style replacement or upgrade protractor head for combination square sets accepting blades up to 24 inches in length.

Installation Notes

Installation is performed by trade professionals or skilled users familiar with combination square assemblies. Secure the head firmly onto the blade before use to prevent slippage during measurement. Inspect the locking mechanism and blade groove for debris or damage before each use. No power tools or electrical shutoff is required for assembly or use of this component.