ASME B1.1-2003 PDF

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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UNR Thread ASME B1.1-2003

To get the complete details, buy b1.1-203 copy and read the Foreward. Proceed to Checkout Continue Shopping. Please first log in with a verified email before subscribing to alerts. To purchase a copy visit an Authorized Reseller. The N-series thread is obsolete. If the pitch diameter stated on the drawing is 0. This did not affect only the pitch diameters, but also several other unified inch screw thread dimensions throughout Table 2.


We have no amendments or corrections for this standard. The third-party inspector does not understand the finer points of subtle change over time in the screw thread standard b1.1-22003 if it says NC-2 on the drawing, the gage had better read NC-2 or his part will get rejected. This is a seemingly innocuous statement, but this is where the pitch diameters change by 0.


The first sentence in the Foreward is their strongest move to eliminate the N-series screw threads once and for all. There are several other changes in the standard, as would be expected. Top Gage Crib Worldwide, Inc. As the voice of the U.

ASME B (R) – Unified Inch Screw Threads, (UN and UNR Thread Form) (B – )

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That was the time that the N-series was replaced with the UN-series. Revision to some values in Table 2: This Standard specifies the thread form, series, class, allowance, tolerance, and designation for unified screw threads. I personally will do everything I can to eliminate the confusion which can lead to controversy. Make drawing changes at the detail level of product designs. Several variations in thread form have been developed for unified threads; however, this Standard covers only [Unified] UN and B1.1-22003 [external threads only] thread forms.


It informs all who make 60 degree inch screw threads that all previous versions of the standard have been replaced. The pitch diameters are the b1.1-2030 visible b1.1-0203 the numbers that changed. Please first verify your email before subscribing to alerts.

Well here we are in and I daily get screw thread gage requests for the N-series thread. The difference is only 0. I expect that paragraph 8. Table 3B has been moved: This is something that all engineers need to address.

It removes certain screw thread combinations from the select status of Standard Special. Need more than one copy? What is the big controversy? This standard is also available to be included in Standards Subscriptions. Second, the thread bb1.1-2003 was changed from N to UN.