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. Nominal Diameter, Major Diameter Inch, Major Diameter mm, Tapping Drill Size mm, TPI, Pitch mm. 5/16″ – 20 UNR, , , , 20, 5/16″ – IFI NOTES: 1. ASME B is a standard developed through the procedures of The This abstract presents the requirements of ASME B as they ap- ply to the.
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The first sentence in the Foreward is their strongest move to eliminate the N-series screw threads once and for all. This standard is also available to be included in Standards Subscriptions. Begin an education process aimed at third-party government inspectors to train them to understand and work to the now current version of 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? Proceed to Checkout Continue Shopping.
It is suggested that you obtain a copy of the revised standard and begin implementation of the new standard immediately. Gage Crib Worldwide, Inc. To purchase a copy visit an Authorized Reseller. After all that explaining the requestor replies that: This is something that all engineers need to address. When the drawing indicates the N-series screw thread, it is known that the thread is specified in B1. The print requires the N-series and he does not dare deviate from the drawing.
Please first log in with a verified email before subscribing to alerts. If same 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. We have no amendments or corrections for this standard. The pitch diameters are the most visible of the numbers that changed.
I expect that paragraph 8. 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. The N-series thread is b1.1-20003.
What is the big controversy? Live Chat Powered by jivochat. It informs all who make 60 degree inch screw threads that all previous versions of the standard have been replaced.
Please first verify your email before subscribing to alerts. It does not eliminate the UNS designation, but will eventually restrict their use to those b1.1-20033 to do the math to engineer the thread because as of the next revision of the standard the chart will disappear.
I hope we are not we looking b1.1-20003 another 60 years of controversy. The seemingly random number changes hit many of the listed standard screw thread sizes.
ASME B (R) – Unified Inch Screw Threads, (UN and UNR Thread Form) (B – )
I explain to the requestor: I personally will do everything I can to eliminate the confusion which can lead to controversy. This statement could be used as authorization to deviate from a drawing. Need more than one copy? This Standard specifies the thread form, series, class, allowance, tolerance, and designation for unified screw threads.
The revisions pose the risk of controversy over thread requirements and disputes over part acceptability. You may delete a document from your Alert Profile at any time. If the pitch diameter stated on the drawing is 0. The drawings are not under his control and it takes an act of congress to get a drawing change.
Revision to some values in Table 2: In order to emphasize that unified screw threads are based on inch modules, they may be denoted unified inch screw threads. Nonmandatory Appendices A through E contain useful information that is supplementary to the sections of as,e Standard. This did not affect only aeme pitch diameters, but also several other unified inch screw thread dimensions throughout Table 2.
Standards Subsctiption may be the perfect solution.
UNR Thread ASME B1.1-2003
By replacing all previous versions of the standard the N-series screw thread, defined in B1. There are several other changes in the standard, as would be expected. The standard has been revised six times, assme still people insist on using the version of the standard! The difference is only 0. Two basic things in B1.