Spi 13-275-3 Combination Square Set 12 in 4 Piece

Product Description

The SPI 13-275-3 is a 4-piece combination square set built for layout, measurement, and inspection tasks in trade and industrial settings. The set includes a 12-inch hardened steel blade graduated in 16R increments, a square head, a protractor head, and a center head, all made from cast iron. Graduation increments are 0.01 inch, 0.02 inch, and 0.03 inch, giving technicians, machinists, and pipefitters precise reference across multiple measuring tasks. The hardened steel blade resists wear through repeated use in shop environments. The set weighs 3.25 pounds and is packaged as a single unit.

This combination square set is suited for residential and commercial trade applications where accurate layout and angle measurement are required. Machinists, pipefitters, HVAC sheet metal fabricators, and general tradespeople use combination square sets for marking cut lines, checking 90-degree and 45-degree angles, finding center points on round stock, and measuring depth. The protractor head extends the set's usefulness to any task requiring angle transfer or verification beyond the standard square.

Key Features

• 4-piece set includes square head, protractor head, and center head plus blade
• 12-inch hardened steel blade for durability under repeated shop use
• Cast iron heads for stable, accurate seating on the blade
• 16R graduation style with increments of 0.01 inch, 0.02 inch, and 0.03 inch
• Center head allows quick location of center points on cylindrical stock
• Protractor head enables direct angle measurement and transfer

Compatibility

Designed as a general-purpose combination square set suitable for layout and inspection tasks across machining, fabrication, plumbing, and HVAC sheet metal trades.

Installation Notes

Combination square sets require no installation but should be inspected for blade straightness and head fit before use. Handle the hardened blade carefully to avoid nicks or drops that can affect accuracy. Store the set in a dry location to prevent rust on the cast iron heads and steel blade. Periodic cleaning and light oiling of the blade is recommended in high-humidity shop environments.