Spi 13-258-9 Combination Square Set 18 Inches 2 Piece

Product Description

The SPI 13-258-9 is a 2-piece combination square set built for layout, marking, and inspection work in trade and industrial environments. The set centers on an 18-inch hardened steel blade graduated in both English and metric units, paired with a cast iron square head for stable, accurate reference. Graduation increments include 0.02 inch, 0.03 inch, 0.5 inch, and 1 mm, giving technicians the resolution needed for precise transfer measurements. Machinists, pipefitters, fabricators, and maintenance mechanics rely on this type of set for scribing lines, checking squareness, and measuring depth or height in the shop or field.

This combination square set is suited for general-purpose layout and inspection tasks across residential and commercial construction, mechanical fabrication, and equipment maintenance. The 18-inch blade length accommodates a wide range of workpiece sizes, and the English and metric dual-graduation format supports mixed-unit workflows common in industrial and trade settings. The cast iron square head provides consistent contact against flat and edge surfaces, making it practical for both bench and job-site use.

Key Features

• 18-inch hardened steel blade for durability and resistance to wear
• Dual English and metric graduation for versatile measurement applications
• Graduation increments of 0.02 inch, 0.03 inch, 0.5 inch, and 1 mm
• Cast iron square head for stable, accurate squareness reference
• 2-piece set covers standard combination square layout tasks

Compatibility

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

Installation Notes

Combination squares require no installation but should be handled carefully to maintain calibration accuracy. Inspect the blade and head interface for play or looseness before use, and keep the blade clean and free of burrs that could affect graduation readability. Store the set in a protective case or dry environment to prevent corrosion of the cast iron head and hardened steel blade.