13MC Starrett 150mm Double Square with Hardened Blade and Graduated Blade

13MC
Starrett

These squares are very popular with machinists, toolmakers, and patternmakers. The sliding blades are adjustable making it practical for a wide variety of uses . The faces of the head are ground square, and the 6" (150mm) size has a level . The bevel blade is available, featuring an octagon angle 45º at one end and a hexagon angle 60º at the other end, clearly marked . A drill grinding blade, also available for 6" (150mm) squares, is beveled to 59º for drillgrinding on one end and 41º (the cutting angle of countersinks for machine screws) at the other . Both ends have quick-reading 64ths grads . and the graduation is located to measure perpendicularly to the axis of the drill . By reading the graduations, the center point can be easily and accurately located . The 6" square head used with the drill grinding blade is approximately 3-1/2" (90mm) long, and the faces approximately
9/16" (14mm) wide .