Starrett 11H-6-4R Combination Square – 6" Blade, Cast Iron Heads, Hardened Steel

Overview

Meet the Starrett 11H-6-4R combination square, a trusted layout tool designed to support professionals and DIY enthusiasts alike. With a 6‑inch blade and robust cast iron heads, this square blends precise measurement with durable construction for everyday workshop tasks.

Precision you can rely on

The 4R graduation type provides readable markings across 8ths, 16ths, quick reading 32nds, and 64ths. This helps you verify angles, mark lines, and transfer dimensions with confidence. The hardened steel blade resists wear, maintaining edge integrity even in demanding workloads.

• Clear 4R divisions enable fast, accurate readings
• Hardened steel blade offers durable edge life
• Defined markings support precise transfer and layout work

Built to last in real-world environments

Designed for reliability in tough shops, the square heads are cast iron for rigidity and long service life. A reversible lock bolt lets you secure settings with ease, providing a stable reference for layout, depth gauging, and leveling tasks.

• Rigidity from cast iron heads under load
• Reversible lock bolt for quick, secure adjustments
• Durable performance across frequent use

Versatility across trades

This Starrett square supports a wide range of tasks—from scribing right angles and parallel lines to measuring, tri-squaring, mitering, depth gauging, and height gauging. It’s a practical tool for toolmakers, mechanics, carpenters, and DIY homeowners.

• Suitable for carpentry, machining, and fabrication workflows
• Single tool that covers marking, measuring, and leveling

Quality details you can rely on

The blade is hardened to resist wear and impact, helping maintain accuracy over time. The reversible lock bolt supports left-handed use or quick adjustments, speeding up setup and reducing misalignment. Markings stay crisp after heavy use.

Care and best practices

• Check alignment against a known reference and recalibrate periodically
• Keep the blade clean and dry to minimize corrosion risk
• Store with the lock bolt loosened when not actively measuring