Nominal Diameter, Major Diameter Inch, Major Diameter mm, Tapping Drill Size mm, TPI, Pitch mm. 10 – 28 UNS, , , , 28, 10 – 36 UNS. ASME B1, was adopted on 20 August and is approved for use by the Federal agencies, The American Society of Mechanical Engineers (ASME). A N A M E R I C A N N A T I O N A L S TA N D A R D Unified Inch Screw Threads ( UN and UNR Thread Form) ASME B [Revision of ASME B

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Refer to ASME 1. External thread minimum pitch diameter [d 2min ]. The N-series is fully mechanically interchangeable with the UN-series. AmesWeb Calculators Screw Threads. The same situation is valid for root of the b1.1-203 threads. Major diameter tolerance of external thread. Use this tolerance class for commercial internal nut threads. The standard has been revised six times, and still people insist on using the asme b1.1-2003 of the standard! Minor diameter tolerance of internal thread.

To get the complete details, buy a copy and read the Foreward. How do we get the message across that when a standard changes, go with the flow and change your drawings asme b1.1-2003 internal procedures to accommodate the revised version of reality? Class b.1-2003 asme b1.1-2003 used for closer tolerances. It removes certain screw thread combinations from the select status of Standard Special. Table 3B has been moved: Unified screw threads and tolerances calculator was developed to calculate basic major, minor and asme b1.1-2003 diameters of the external bolt and internal nut inch thread according v1.1-2003 ASME B1.


Nominal Size in Inches asme b1.1-2003 Threads per Inch. The shapes of the external and internal threads in which the asne of dimensions are applied.

The customer is always right. Used when finer pitches than UNF are needed Ex: Asme b1.1-2003 UNR, the root of the thread is only rounded root contour.

Second, b1.1-2003 thread nomenclature was changed from N to UN.

UNS Thread ASME B1.1-2003

Internal thread maximum minor diameter [D 1max ]. Lead Angle at Asme b1.1-2003 Pitch Dia. UNC give possibility for quick asme b1.1-2003. The third-party inspector does not understand the finer points of subtle change over time in the screw thread standard so if it says NC-2 on the drawing, the gage had better read NC-2 or his part will get rejected. Two basic things in B1.

Calculations can be done by selecting a asme b1.1-2003 thread size from a list of thread sizes which are in the diameter range from 0.

ANSI/ASME B Change Summary

It is also used where the length of engagement is short, where a smaller lead angle is desired, where the wall thickness demands asme b1.1-2003 fine pitch, or where finer adjustment is needed. Tolerance Class for External Thread. Internal thread minimum major asme b1.1-2003 [D min ]. Internal thread maximum pitch diameter [D 2max ]. Asme b1.1-2003 pitch diameters are the most visible of the numbers that changed.


A thread form used by the United Kingdom, Canada, and the United States to obtain screw thread interchangeability among these three nations. Several times in the standard they remind the reader that the N-series is mechanically interchangeable with the UN-series. Class 1 threads are loosely fitting thread and used for ease of assembly. When the drawing indicates the N-series screw thread, it is asme b1.1-2003 that the thread is specified in B1.

Internal thread minimum pitch diameter asme b1.1-2003 2min ]. I hope we are not we looking at another 60 years of asme b1.1-2003. UN Screw Thread Calculator: Thread basic pitch diameter [d 2D 2 ]. Top Gage Crib Worldwide, Inc. It informs all who make 60 degree inch screw threads that all previous asme b1.1-2003 of the standard have been replaced. Gage Crib Worldwide, Inc.

It does not eliminate the UNS designation, but will eventually restrict their use to those willing to do the math to engineer the thread because as of the next revision of the standard the chart will disappear. External thread h1.1-2003 major diameter [d min ]. The last time the screw thread standard was revised this drastically was B1.