![]() ![]() Thread series: Thread series is a standard based upon the number of threads. This thread form is characterized by a 60 degree thread angle and a flat crest and rounded root. Roll Form Tap Drill Chart Calculator for calculation of recommended roll form tap drill sizes for Unified threads. The standard thread form for inch unit threads in U.S. H is equal to insert nominal length +1 Pitch. Thread form is a classification based upon the cross-sectional profile of the thread. The UTS serves as the leading standard for bolts, nuts, and a wide variety of other threaded fasteners used in the USA and Canada. It is the North American equivalent of the ISO metric thread system. Shown below (Dimension H) are the MINIMUM for countersunk holes and insert set-down of 1-1/2 Overview The Unified Thread Standard (UTS) defines a 60 thread form in Inch dimensions as described in the ASME B1.1 standard.
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