Spi 13-261-3 24 in 2-piece Combination Square Set

Product Description

The SPI 13-261-3 is a 2-piece combination square set built for layout, measurement, and inspection work in fabrication, machining, and general trade applications. The set includes a 24-inch hardened steel blade and a cast iron square head, offering the rigidity and durability needed for accurate, repeatable measurements on the shop floor or job site. Graduations are available in both English and metric scales, with increments as fine as 0.02 inches and 0.5 millimeters, making this set suitable for precision layout work across a range of material types and project requirements. Licensed machinists, pipefitters, and fabricators are the primary users of this tool.

This combination square set is designed for use in metalworking shops, fabrication facilities, and trade apprenticeship environments where both English and metric measurement are required. The 24-inch blade length accommodates larger workpieces that shorter 12-inch sets cannot span. The square head allows for 90-degree reference checks, depth measurements, and scribe line layout against a machined surface. The cast iron head provides a stable, wear-resistant reference surface that holds its ground against repeated use on hardened materials.

Key Features

• 24-inch hardened steel blade for rigidity and wear resistance during layout and scribing
• Cast iron square head for a stable, accurate 90-degree reference surface
• Dual English and metric graduation for flexible measurement across project standards
• Fine graduations at 0.02 inches and 0.5 mm support precision layout tasks
• 2-piece set provides complete square head and blade combination out of the box

Compatibility

Designed as a standard combination square set suitable for general metalworking, fabrication, and machining layout applications where a 24-inch blade length is required.

Installation Notes

This tool requires no installation but should be inspected before use to confirm the blade locks securely in the head and the reference surfaces are free of burrs or debris. Store the set in a dry environment to prevent rust on the hardened steel blade. Do not use the tool as a striking instrument, as impact can affect calibration accuracy of the head and blade interface.