11/15/2023 0 Comments Thread form tap chart![]() 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. The most common method used in production is by way of a go/no go gauge. Overview The Unified Thread Standard (UTS) defines a 60 thread form in Inch dimensions as described in the ASME B1.1 standard. Several methods are used to measure the pitch diameter. The pitch diameter is indicated as Dp in the figure shown above. TO ESTABLISH TAP DRILL SIZES FOR METRIC SIZE ROLL FORMING TAPS TAP DRIlL SIZE Basic Tap O.D. Thread class refers to the acceptable range of pitch diameter for any given thread. Classes 1A, 2A, 3A apply to external threads Classes 1B, 2B, 3B apply to internal threads. The letter suffix "A" or "B" denotes whether the threads are external or internal, respectively. It is an interference thread, used on items like spring shackles on an automobile. They are designed to maximize strength considering typical machine shop capability and machine practice.Ĭlass 3 threads are used for closer tolerances.Ĭlass 4 thread fit is even tighter than a Class 3.Ĭlass 5 fit is not a loose thread. This system is analogous to the fits used with assembled parts.Ĭlass 1 threads are loosely fitting threads intended for ease of assembly or use in a dirty environment.Ĭlass 2 threads are the most common. Most (but certainly not all) threaded items are made to a classification standard called the Unified Screw Thread Standard Series. Major Diameter Minor Diameter Drill Size. ![]() A classification system exists for ease of manufacture and interchangeability of fabricated threaded items. Tap Drill Chart: Tapped Hole Stainless Steel, Steels, Iron Microform Precision. ![]()
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