Details
Robert Sorby #973 Thread & Sizing Gauge

Ideal for box makers, this gauge takes all the guesswork out of dimensioning projects when cutting threads on the lathe. With the gauge set at the unmarked anvil this creates a 1:1 correlation between the measuring faces and facilitates accurate push fits. The other three anvils are marked 10, 16, and 20, which relates to the most common tpi (threads per inch) used by thread cutters. The gauge has a built-in compensation factor to ensure a perfect, tight thread fit between the internal and external diameters every time. Made in England!