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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Revision to some values in Table 2: 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?
ASME B (R) – Unified Inch Screw Threads, (UN and UNR Thread Form) (B – )
After all that explaining the requestor replies that: The customer is always right. What is the big controversy? Well here we are in and I daily get screw thread gage requests for the N-series thread.
When the drawing indicates the N-series screw thread, it is known that the thread is specified in B1. I personally will do everything I can to eliminate the confusion which can lead aske controversy. The revisions pose the risk of controversy over thread requirements and same over part acceptability.
Standards Subsctiption may be the perfect solution. Nonmandatory Appendices A through E contain useful information that is supplementary to the sections of this Standard. The standard has been revised six times, and still people insist on using the version of the standard! So what changed in the B1. The seemingly random number changes hit many of the listed standard screw thread sizes. Gage Crib Worldwide, Inc. Begin an education process aimed at third-party government inspectors to train them to understand and work to the now current version of B1.
This standard is also available to be included in Standards Subscriptions.
For easy reference, a metric translation of this Standard has been incorporated as Nonmandatory Appendix C. If the pitch diameter stated on the drawing is 0.
ANSI/ASME B Change Summary
This did not affect only the pitch diameters, but also several other unified inch screw thread dimensions throughout Table 2. That was the time that the N-series was replaced with the UN-series. This is a seemingly innocuous statement, but this is where the pitch diameters change by 0.
Table 3B has been moved: Your Alert Profile lists the documents that will be monitored. Top Gage Crib Worldwide, Inc. That does not seem like much. The N-series screw thread was replaced in with the UN-series. To purchase a copy visit an Authorized Reseller. You can download and open this file to your own computer but DRM prevents opening this file on another computer, including a networked server. The print requires the N-series and he does not dare deviate from the drawing. The drawings are not under his control and it takes b1.1-003 act of congress to get a drawing change.
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.
If the drawing change process is too daunting, issue a blanket engineering change order dictating that 60 degree inch series screw threads will be made to the most current version of B1. It is suggested that amse obtain a copy of the revised standard and begin implementation of the new standard immediately. As the voice of the U.
By replacing all previous versions of the standard the N-series screw thread, defined in B1. Live Chat Powered by jivochat. Subscription pricing is determined by: There are several other changes in the standard, as would be expected. First the pitch diameters of the threads were adjusted by 0.
UNS Thread ASME B1.1-2003
It informs all who make 60 degree inch screw threads that all previous versions of the standard have been replaced. Make drawing changes at the detail level of product designs.
Two basic things in B1.
This Standard specifies the thread form, series, class, allowance, tolerance, and designation for unified screw threads.
You may delete a document from your Alert Profile at any time. The intention is to provide accurate information; regardless; errors may exist in the supplied information. Second, the thread nomenclature was changed from N to UN.