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.
|Published (Last):||10 July 2004|
|PDF File Size:||6.11 Mb|
|ePub File Size:||12.61 Mb|
|Price:||Free* [*Free Regsitration Required]|
The N-series screw thread was replaced in with asem UN-series. The customer is always right. This Standard specifies the thread form, series, class, allowance, tolerance, and designation for unified screw threads. 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?
The pitch diameters are the most visible of the numbers that changed. The drawings are not under his control and it takes an act of congress to get a b1.1-203 change. The N-series is fully mechanically interchangeable with the UN-series. Table 3B has been moved: 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.
Two basic things in B1. Make drawing changes at the detail level of product designs. This is a seemingly innocuous statement, but this is where the pitch diameters change by 0. You can download and open this file to your own computer but DRM prevents opening this file on another computer, including a networked server.
UNS Thread ASME B1.1-2003
It removes certain b1.11-2003 thread combinations from the select status of Standard Special. You may delete a document from your Alert Profile at any time. The N-series thread is obsolete. Your Alert Profile lists the documents that will be monitored. When the drawing indicates the N-series screw thread, it is known that the thread is specified in B1. 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.
Subscription pricing is determined by: I personally will do everything I can to eliminate the confusion which can lead to controversy.
UNS Thread ASME B
Already Subscribed to this document. Please first verify your email before subscribing to alerts. Nonmandatory Appendices A through E contain useful information that is supplementary to the sections of this Standard.
There are several other changes in the standard, as would be expected. Standards Subsctiption may be the perfect solution. Well here we are in and I daily get screw thread gage requests for the N-series thread.
I explain to the requestor: Several times in the standard they remind the reader that the N-series is mechanically interchangeable with the UN-series. This statement could be used as authorization to deviate from a drawing.
Top Gage Crib Worldwide, Inc. I hope we are not we looking at another 60 years of controversy. This statement is strong because it has been printed in the now current standard. This is something that all engineers need to address. Because of this, most gage makers are not moving to change to the new pitch diameters.
Begin an education process aimed at third-party government inspectors to train them to understand and work to the now current version of B1. I expect that paragraph 8. Live Chat Powered by jivochat. What is the big controversy? Please first log in with a verified email before subscribing to alerts. So what changed in the B1.
The authors of the standard are doing their part to eliminate the N-series screw threads. This standard is also available to be included in Standards Subscriptions.
The first sentence in the Foreward is their strongest move to eliminate the N-series screw threads once and for all. This did not affect only the pitch diameters, but also several other unified inch screw thread dimensions throughout Table 2. If the document is revised or amended, you will be notified by email. The revisions pose the risk of controversy over thread requirements and disputes over part acceptability.
If accuracy is critical, base your final decisions on b1.1–2003 data provided in the root document: Need more than one copy?
Proceed to Checkout Continue Shopping. The last time the screw thread standard was revised this drastically was B1.
Gage Crib Worldwide, Inc. To get the complete details, buy a copy and read the Foreward. Revision to some values in Table 2: