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13 Φεβ 2015 · Tolerance classes 1B, 2B and 3B apply to internal threads. The class tolerance determines the size of the gap between the pitch diameters of the internal and external thread. class 1A and 1B have the largest gap to class 3A and 3B which have the smallest gap.
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Basic Thread Dimensions (UNC, UNF & UNEF) The basic dimensions are nominal dimensions of a unified thread profile without allowance and tolerances (The thread class defines that). They are based on standard ASTM B1.1. The basic dimensions can be used for design.
For all classes, equals maximum pitch diameter, minus pitch diameter tolerance for respective class of thread. (e) Maximum Minor Diameter (External Threads). In dimensioning UN series external threads, the minor diameter is not specified.
ASME UN screw thread calculator to calculate imperial unified screw thread basic major, minor, pitch diameters and thread tolerance for the external (bolt) and internal (nut) inch threads according to ASME B1.1 standard.
Allowance is specified only for Classes 1A and 2A and the allowance is identical for both classes. Tolerance decreases as class number increases (e.g., tolerance for Class 3A is less than that for Class 2A, which is less than that for Class 1A).
To manufacture and measure a thread, you also need to obtain the allowed tolerances, which are given in the next tab. If the thread is coated and you want to obtain the dimensions before coating for your production, simply enter the coating thickness, and the calculator will do all the math for you.
Unified (UN) screw threads are a standard form of thread used in the United States and other countries around the world. They are widely used in a variety of applications, including fasteners, machinery, and other equipment that requires secure and reliable threaded connections.
