Starrett 55993 Combination Square Blade 12 in 300mm

Product Description

The STARRETT 55993 is a replacement combination square blade designed for use with compatible combination square heads and accessories. Machined from steel with a satin chrome finish, this blade measures 12 inches (300mm) in length and carries dual-unit graduations in both English and metric scales. English graduations are marked at 1/64 and 1/32 inch intervals, while metric graduations run at 0.5mm and 1mm intervals. At 25mm wide and 2.4mm thick, the blade offers rigid support for layout, scribing, and measurement tasks. It is suited to machinists, fabricators, pipefitters, and general tradespeople who require accurate layout work on the bench or in the field.

This blade fits into combination square sets as a direct replacement or upgrade component. It is appropriate for residential and commercial trade applications including layout work on structural steel, pipe, sheet metal, and dimensional lumber. The dual English and metric graduation makes it practical in shops or job sites where both measurement systems are in use. Installation into a combination square head requires no tools beyond the head's locking mechanism.

Key Features

• 12 inch (300mm) blade length with dual English and metric graduation
• English graduation at 1/64 inch and 1/32 inch intervals
• Metric graduation at 0.5mm and 1mm intervals
• Steel construction with satin chrome finish for corrosion resistance and glare reduction
• 25mm blade width and 2.4mm blade thickness for rigidity during layout tasks
• Compatible with standard combination square heads accepting 12-inch blades

Compatibility

Designed as an OEM-style replacement blade for combination square sets that accept a standard 12-inch blade format. No specific compatible head model numbers were provided in the product data.

Installation Notes

Installation is performed by machinists, fabricators, or experienced tradespeople familiar with combination square sets. Insert the blade through the combination square head and secure using the head's thumb nut or locking screw. Ensure the blade seats fully and the locking mechanism is tight before taking measurements. No power source or lockout procedure is required for this mechanical hand-tool component.