Spi 13-455-1 Combination Square Blade 12 Inch

Product Description

The SPI 13-455-1 is a 12-inch combination square blade designed for precise layout and measurement work in both English and metric units. The blade carries dual-unit graduations — 1/64 inch, 1/32 inch, 0.5 mm, and 1 mm — making it well suited for tradespeople who work across imperial and metric specifications on the same job. A baked enamel coating protects the blade surface from wear and corrosion in shop and field environments. This blade is used as a component of a standard combination square set and is appropriate for machinists, pipefitters, electricians, and general tradespeople requiring reliable, repeatable layout measurements.

This replacement blade fits standard combination square heads and is used in residential and commercial applications where layout accuracy matters. Typical use cases include scribing cut lines on conduit, pipe, sheet metal, framing lumber, and structural members. The 12-inch length covers most common layout tasks without requiring repositioning. Tradespeople who need a replacement blade due to damage or who want a dual-graduation option for metric-compatible work will find this a direct solution.

Key Features

• 12-inch blade length suitable for a wide range of layout and measurement tasks
• English graduations at 1/64 inch and 1/32 inch for fine imperial measurement
• Metric graduations at 0.5 mm and 1 mm for metric-compatible layouts
• Baked enamel finish provides corrosion resistance and legible scale contrast
• Compatible with standard combination square heads as a drop-in replacement blade

Compatibility

Designed as a replacement blade for standard combination square sets accepting 12-inch blades. No specific head model compatibility was provided in the product data — verify head slot dimensions before ordering.

Installation Notes

Installation is performed by sliding the blade into the combination square head and securing it with the head's locking screw — no special tools are required beyond what is built into the square head itself. Inspect the blade slot and locking mechanism on the head for wear before installing a new blade. Ensure the blade seats flush and the locking screw holds without play before using the assembly for layout work. No power shutoff or code requirements apply to blade replacement on hand tools.