Nominal Diameter, Major Diameter Inch, Major Diameter mm, Tapping Drill Size mm, TPI, Pitch mm. 10 – 28 UNS, , , , 28, 10 – 36 UNS. ASME B1, was adopted on 20 August and is approved for use by the Federal agencies, The American Society of Mechanical Engineers (ASME). A N A M E R I C A N N A T I O N A L S TA N D A R D Unified Inch Screw Threads ( UN and UNR Thread Form) ASME B [Revision of ASME B

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External thread UNR maximum minor diameter [d 3max ].

Unified Screw Threads and Tolerances (Inch)

asme b1.1-2003 I explain to asme b1.1-2003 requestor: Most commonly used type for general engineering applications. When the drawing indicates the N-series screw thread, it is known that the thread is specified in B1.

Use this tolerance asme b1.1-2003 for commercial external bolt threads. Tolerance Class for External Thread. The minimum diameters of Class 1B, 2B asme b1.1-2003 3B threads, whether or not plated or coated, are basic and give no allowance or clearance for assembly at maximum-material limits. 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 asme b1.1-2003.


Thread gauges are not used for precise measurements but allows user to determine thread pitch without losing time. This statement could be used as authorization to deviate from a drawing. Internal thread minimum minor diameter [D 1min ].

The authors of the standard are doing their part to eliminate the N-series screw threads. That does not seem like much. The UN thread is intended for general purpose fastening operations. The first asme b1.1-2003 in asme b1.1-2003 Foreward is their strongest move to eliminate the N-series screw threads once and for all. The minimum diameter of a thread which is diameter asme b1.1-2003 the root of a male thread or crest of a female thread. There are several other changes in the standard, as would be expected.

ANSI/ASME B Change Summary

Asme b1.1-2003 to some values in Table 2: It removes certain screw thread combinations from the select status of Standard Special. What is the big controversy? It is suggested that you obtain a copy of the revised standard and begin implementation of the new standard immediately. To purchase a copy visit an Authorized Reseller. The customer is always right. In asme b1.1-2003 to asme b1.1-2003 size calculations, limits of sizes calculations of different tolerance classes can be done according to same standard.


The user shall use class 2A for bolts and 2B for nuts unless there is a specific requirement to use other tolerance classes. I hope we are not we looking at another 60 years of controversy. A classification system asme b1.1-2003 classify the threads for interchangeability and manufacturability.

External thread minimum pitch diameter [d 2min ]. Thread basic asme b1.1-2003 diameter [d 2D 2 ]. UN Screw Thread Calculator: Internal thread minimum major diameter [D min ].

I personally will do everything I can to eliminate the confusion which can lead to controversy. Two basic things in B1. Only in Class 2A threads is the asme b1.1-2003 available to b1.1-2003 coatings.

So what changed in the B1.

UNS Thread ASME B1.1-2003

B1.1-203 N-series screw thread was replaced in with the UN-series. Major diameter tolerance of external thread. How do we get the message across that when a standard changes, go with the flow and change your asme b1.1-2003 and internal procedures to accommodate the revised version of asme b1.1-2003