Spi 13-274-6 Combination Square Set 12in 4-piece

Product Description

The SPI 13-274-6 is a 4-piece combination square set built for layout, measurement, and inspection work in trade and industrial settings. The set includes a 12-inch hardened steel blade and three interchangeable cast iron heads: a square head, a center head, and a protractor head. Blade graduations follow the 4R pattern, marked in 1/64-inch, 1/32-inch, 1/16-inch, and 1/8-inch increments, giving the user multiple reference scales on a single blade. This set is used by machinists, pipefitters, ironworkers, and general tradespeople who need reliable angle, depth, and layout readings on the job.

The 13-274-6 set is suited for both shop and field use. The square head is used for 90-degree and 45-degree angle layout. The center head locates center points on round stock. The protractor head reads angles for miter, bevel, and custom-angle layout. All three heads mount to the same 12-inch blade, making the set a compact, multi-function layout tool for metal fabrication, mechanical assembly, and structural work.

Key Features

• 12-inch hardened steel blade for durability and long-term accuracy
• 4R graduation pattern: 1/64, 1/32, 1/16, and 1/8 inch scales on one blade
• Three cast iron heads included: square, center, and protractor
• Interchangeable heads work on a single shared blade
• Hardened steel blade resists wear from repeated use and sliding
• Compact 4-piece design covers most common layout and inspection tasks

Compatibility

Designed as a general-purpose combination square set compatible with standard 12-inch blade layout applications across metal fabrication, mechanical assembly, and structural trade work.

Installation Notes

No installation is required for this tool. Before use, verify that all head locking mechanisms are fully tightened to prevent blade slippage during measurement. Inspect the blade and head contact surfaces for burrs or debris that could affect reading accuracy. Store the set in a dry environment to prevent rust on the hardened steel blade and cast iron heads.