Spi 13-251-4 Combination Square Set 6 Inch 2 Piece

Product Description

The SPI 13-251-4 is a 2-piece combination square set designed for precise layout, marking, and measurement work in trade and industrial environments. The set includes a 6-inch hardened steel blade graduated in 16R style, providing readings at 1/100, 1/32, 1/50, and 1/64 inch increments. The cast iron square head locks onto the blade securely for consistent 90-degree and 45-degree reference. Machinists, pipefitters, millwrights, and skilled tradespeople use combination squares for scribing lines, checking squareness, and transferring measurements on metal, pipe, and structural components.

This combination square set is suited for use in machine shops, fabrication facilities, and mechanical contracting environments. The 6-inch blade length makes it practical for bench work, layout on smaller stock, and confined-space measurement tasks. The 16R graduation pattern covers the most common fractional and decimal inch divisions used in general mechanical and pipe trade work, reducing the need to switch between multiple scales during a single job.

Key Features

• 6-inch hardened steel blade resists wear during repeated use on metal surfaces
• 16R graduation provides 1/100, 1/32, 1/50, and 1/64 inch scales on a single blade
• Cast iron square head delivers stable 90-degree and 45-degree reference without flex
• 2-piece set includes blade and square head for out-of-box use
• Compact 6-inch blade length suited for bench layout and close-quarters work

Compatibility

Designed as a standard combination square set compatible with typical 6-inch combination square accessories and replacement blades that conform to 16R graduation specifications.

Installation Notes

No power source is required for use. Ensure the blade locking mechanism is fully tightened before scribing or checking a reference surface to prevent blade movement mid-measurement. Clean mating surfaces of chips and debris before taking a measurement to avoid false readings. Handle the hardened steel blade with care to prevent edge chipping on hard surfaces.