Spi 13-452-8 Combination Square Blade 6 Inch

Product Description

The SPI 13-452-8 is a 6-inch replacement blade for combination squares, graduated in both English and metric units. The blade carries 1/64-inch, 1/32-inch, 0.5 mm, and 1 mm graduations, making it a practical tool for mixed-unit layout and inspection work. A baked enamel finish protects the graduated markings from shop wear and fluid exposure. The blade weighs 0.1 pounds and is sized for direct use in standard combination square heads. Machinists, tool and die workers, pipefitters, and general trade mechanics use this blade for scribing, transferring measurements, and checking square on flat or cylindrical stock.

This blade fits into combination square heads designed to accept a 6-inch blade. It suits bench-top layout work, in-field measurement checks, and precision marking tasks across metalworking, fabrication, and mechanical trade environments. The dual English and metric graduation is especially useful in shops working to both inch and millimeter tolerances without switching tools. The baked enamel coating keeps graduations legible under oily or greasy conditions common in HVAC, plumbing, and general mechanical service settings.

Key Features

• 6-inch blade length for compact, close-quarter layout work
• English graduations at 1/64 inch and 1/32 inch for fine and coarse inch-based measurement
• Metric graduations at 0.5 mm and 1 mm for millimeter-tolerance work
• Baked enamel finish protects markings from shop fluids and mechanical wear
• Lightweight at 0.1 pounds — easy to carry in a tool pouch or apron

Compatibility

Designed as a replacement blade for combination squares that accept a standard 6-inch blade with English and metric graduation.

Installation Notes

Installing a replacement combination square blade requires loosening the locking nut or screw on the combination square head and sliding the old blade out of the head channel. Insert the new blade with the graduated face oriented correctly for your reading preference, then retighten the head lock. No power shutoff is required. Verify that the blade seats flush and square in the head before use to ensure accurate measurements.