An engineer’s square is a simple yet versatile hand tool, widely used across many industries, disciplines and projects. Also called machinist squares, they are normally L-shaped metal tools sold in various sizes. Engineers squares are used to accurately check and mark angles, or to verify the squareness of straight edges and lines.
High-quality squares are precision made to form a perfect 90-degree right angle, against which you can test all manner of edges, planes and corners on a workpiece. Since true squareness is essential for almost every kind of carpentry, metalworking, and engineering task, a well-made square is a vital part of many professional tool kits.
When buyers ask, ‘what is an engineer’s square?’, they often want to know the precise difference between these tools and other similar products. They may already be familiar with related items, including combination squares, speed squares, and machinist squares.
While a few of these terms are used interchangeably, there are several important differences. The proper definition of engineers or machinists squares usually includes being made entirely from high-grade metal, typically hardened tool steel.