ASME B1.1-2003 PDF

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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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. So what changed in the B1.

This standard is also available to be included in Standards Subscriptions.

We have no amendments or corrections for this standard. This statement is strong because it has been printed in the now current standard. The N-series screw thread was replaced in with the UN-series. The seemingly random number changes hit many of the listed standard screw thread sizes.

UNS Thread ASME B1.1-2003

Subscription pricing is determined by: It informs all who make 60 degree inch b1.1-2003 threads that all previous versions of b.1-2003 standard have been replaced. Begin an education process aimed at third-party government inspectors to train them to understand asmme work to the now current version of B1. To purchase a copy visit an Authorized Reseller. 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?


To get the complete details, buy a copy and read the Foreward. 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.

By replacing all previous versions of the as,e the N-series screw thread, defined in B1. As the voice of the U. 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.

This statement could be used as authorization to deviate from a drawing. There are several other changes in the standard, as would be expected. The difference is only 0. Second, the thread nomenclature was changed from Axme to UN. I hope we are not we looking at another 60 years of controversy.

Two basic things in B1. Need more than one copy? Your Alert Profile lists the documents that will be monitored. Table 3B has been moved: This is a smart move to encourage standardization. Gage Crib Worldwide, Inc. It is suggested that you obtain a copy of the revised standard and begin implementation of the new standard immediately.


You can download and open this b1.1-20033 to your own computer but DRM prevents opening this file on another computer, including a networked server. Please first verify your email before subscribing to alerts.

This standard is not included in any packages. Standards Subscriptions from ANSI provides a money-saving, multi-user solution for accessing standards. The revisions pose the risk of controversy over thread requirements and disputes over part acceptability.

If the document is revised or amended, you will be notified by email.


Already Subscribed to this document. The standard has been revised six times, and still people insist on using the version of the standard! Standards Subsctiption may be the perfect solution. The customer is always right. Several times in the standard they remind the reader that the N-series is mechanically interchangeable with the UN-series.

The authors of the standard are doing their part to eliminate the N-series screw threads. This is something that all engineers need to address. The drawings are b1.1-0203 under b1.1-2003 control and it takes an act of congress to get a drawing change.

I expect that paragraph 8. I explain to the requestor: It removes certain screw thread combinations from the select status of Standard Special.