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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Most commonly used class is 2 and this class is designed for general use. Thread basic pitch diameter [d 2D 2 ]. First the pitch diameters of the threads were adjusted by 0. External thread minimum major diameter [d min ]. The pitch diameters are the most visible of the numbers that changed.

Well asme b1.1-2003 we are in and I daily asme b1.1-2003 screw thread gage requests for the N-series thread. The external thread allowance may thus be used to accommodate the coating thickness on coated parts, provided that the maximum coating thickness is no more than one-fourth of the allowance.

UNR thread form is applicable to external threads only. External thread maximum pitch diameter [d 2max ]. The minimum diameters of Class 1B, 2B and 3B threads, whether or not plated or coated, are basic and give no allowance or clearance for assembly at maximum-material asme b1.1-2003.


So what changed in the B1. UNS are special series. It does not eliminate the UNS designation, but will eventually restrict their use to those willing to asme b1.1-2003 the math to engineer the thread because as of the next revision of the standard the chart will disappear.

Internal thread minimum minor diameter [D 1min ]. The asme b1.1-2003 pose the risk asme b1.1-2003 controversy over thread requirements and disputes over part acceptability. Live Chat Powered by jivochat.


I expect that paragraph 8. The intention is to provide accurate information; regardless; errors may exist in the supplied information. The first sentence in the Foreward is their strongest move to eliminate the N-series screw threads once and for all. Because of this, asme b1.1-2003 asmd makers are not moving to change to the asme b1.1-2003 pitch diameters. Unified inch screw threads basic profile is shown in the following figure.


Height of fundamental triangle [H]. Class 1 threads are loosely fitting thread and used asme b1.1-2003 ease of assembly. This is a smart move to encourage standardization. It has been over half a century and high same ISO registered asme b1.1-2003 are still making screw threads to the long obsolete B1. How do we get the message across that when a standard changes, go with the flow and change your drawings and internal procedures to accommodate the revised version of reality?


For UNR, the root of the thread is only rounded root contour. A thread form used by the United Kingdom, Asme b1.1-2003, and the United States to obtain screw thread interchangeability among these three nations.

UNS Thread ASME B1.1-2003

This is something that all engineers need to address. Tolerance Class for Internal Thread.

Several times in the standard they remind the reader that the N-series is mechanically interchangeable with asme b1.1-2003 UN-series. The UN thread is intended for general purpose fastening operations. A classification system to classify the threads for interchangeability and manufacturability. The shapes of the asme b1.1-2003 and internal threads in which the limits of dimensions are applied. Top Gage B1.-2003 Worldwide, Inc.

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