Description

Trapezoidal Thread Ring Gauges Trapezoidal Thread Forms are more common thread forms used for lead screws and vises. They offer high strength and ease of manufacture. Standardized variations include multiple-start threads, left-hand threads, and self-centering threads. The trapezoidal metric thread form is similar to the Acme thread form, except the thread angle is 30°. Trapezoidal threads are designated as Tr. Trapezoidal thread forms are made as per DIN 103.