Spi 30-231-5 Combination Square Set 12 Inch 4 Piece

Product Description

The SPI 30-231-5 is a 4-piece combination square set built for precision layout, scribing, and angle measurement in trade and industrial applications. The set includes a 12-inch hardened steel blade graduated in both English and metric units, a standard square head, a center head, and a protractor head. Blade graduations read in 1/32-inch and 1/64-inch increments on the inch scale, with 0.5 mm increments on the metric scale. The hardened steel construction on both the blade and heads resists wear under repeated shop-floor use. The full set covers the most common measurement tasks a machinist, pipefitter, or layout tech encounters on a daily basis.

This combination square set is suited for metal fabrication shops, machine shops, pipefitting, and general industrial layout work. The three interchangeable heads allow the same blade to function as a try square, a center finder for round stock, and a protractor for angle setting. It is a standard bench and layout tool for machinists, tool-and-die workers, and skilled tradespeople who require consistent, repeatable measurements across a range of tasks.

Key Features

• 12-inch hardened steel blade with English and metric dual graduation
• 1/32-inch and 1/64-inch inch-scale graduation for fine layout work
• 0.5 mm metric graduation on the same blade
• Three heads included: square head, center head, and protractor head
• Hardened steel blade and head construction for durability and wear resistance
• 4-piece set covers squaring, center-finding, and angle measurement in one kit

Compatibility

Designed as a standard 12-inch combination square set compatible with typical replacement blades and heads that follow conventional combination square fitment dimensions.

Installation Notes

This is a hand measurement tool and requires no installation. Before use, verify the square head is fully seated and the locking nut is tightened securely to prevent blade movement during layout. Keep the blade and head contact surfaces clean and free of burrs to maintain measurement accuracy. Store the set in its case or on a protected surface to prevent damage to the hardened steel blade edge.