Buy ASME B UNIFIED INCH SCREW THREADS, (UN AND UNR THREAD FORM) from SAI Global. ANSI/ASME B was revised in The revisions pose the risk of controversy over thread requirements and disputes over part acceptability. ASME B [Revision of ASME B (R)] Unified Inch Screw Threads (UN and UNR Thread Form) A N A M E R I C A N N AT I O N A L STA N DA.

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To purchase a copy visit an Authorized Reseller. Standards Subsctiption may be the perfect solution. Several times in the standard they remind the reader that the N-series is mechanically interchangeable with the UN-series.

UNS Thread ASME B1.1-2003

This did not affect only the pitch diameters, but also several other unified inch screw thread dimensions throughout Table 2. There are several other changes in the standard, as would be expected. When the drawing indicates the N-series screw thread, it is known that the thread is specified in B1. The customer is always right. I personally will do everything I can to eliminate the confusion which can lead to controversy.

The pitch asem are the most visible of the numbers that changed. After all that explaining the requestor replies that: Second, the thread nomenclature was changed from Asne to UN.

The intention is to provide accurate information; regardless; errors may exist in the supplied information. Nonmandatory Appendices A through E contain useful information that is supplementary to the sections of this Standard. The print requires the N-series and he does not dare deviate from the drawing.


To get the complete details, buy a copy and read the Foreward. If accuracy asmee critical, base your final decisions on the data provided in the root document: Well here we are in and I daily get screw thread gage requests for the N-series thread. The third-party inspector does not understand the finer points of subtle change over time in the screw thread b.11-2003 so if it says NC-2 on the drawing, the gage had better read NC-2 or his part will get rejected.

ASME B | Сергей Сергацков –

Several variations in thread form have been developed for unified threads; however, this Standard covers only [Unified] UN and UNR [external threads only] thread forms. I explain to the requestor: I expect that paragraph 8. Begin an education process aimed at third-party government inspectors to train them to understand and work to the now current version of B1.

As the voice of the U. Live Chat Powered by jivochat. The seemingly random number changes hit many g1.1-2003 the listed standard screw thread sizes.

This is a smart move to encourage standardization. Please first log in with a verified email before subscribing to alerts. This Standard specifies the thread form, series, class, allowance, tolerance, and designation for unified screw threads.

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If the document is revised or amended, you will be notified by email. Make drawing changes at the detail level of product designs. The standard has been revised six times, and still people insist on using the version of the standard! First the pitch diameters of the threads were adjusted by 0. In order to emphasize that unified screw threads are based on inch modules, they may be denoted unified inch screw threads.


The N-series is fully mechanically interchangeable with the UN-series. It is suggested that you obtain a copy of the revised standard and begin implementation of the new standard immediately. Standards Subscriptions from ANSI provides a money-saving, multi-user solution for accessing standards. This statement is strong because it has been printed in the now current standard. Revision to some values in Table 2: The first sentence in the Foreward is their strongest move to eliminate the N-series screw threads once and for all.

ANSI/ASME B Change Summary

You may delete a document from your Alert Profile at any time. Because of this, most gage makers are not moving to change to the new pitch diameters. The N-series thread is obsolete. We b1.12-003 no amendments or corrections for this standard. 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.

Subscription pricing is determined by: Proceed to Checkout Continue Shopping. This standard is also available to be included in Standards Subscriptions. The N-series screw thread was replaced in with the UN-series. That was the time that the N-series was replaced with the UN-series. Need more than one copy?