April 26, 2005 - WHERE The J series thread is defined in specification ANSI/ASME SAE AS8879 (formerly MIL-S-8879) and in ANSI/ASME B1.15 · WHY The rounded root of a UNJ external thread greatly improves fatigue strength over that of a flat root UN thread. It seems that sharp cuts at the minor diameter of the ...

UNJ, UNJC, UNJF and UNJEF threads are almost identical to UN, UNC, UNF, and UNEF threads except that the external J thread has a much larger root radius than the standard UN threads and inspection must be performed on this element. The Special UNJ threads are designated by the nomenclature UNJS.

May 25, 2026 - The UNJ thread standard (ASME B1.15) defines a system of threads for highly stressed applications requiring high fatigue strength. It was derived from a military specification (MIL-S-8879) originally published in December 1965.

At Scientific Cutting Tools (SCT), ... Our UNJ external thread mills, made from premium sub-micron carbide, are designed for high-strength applications such as aerospace and defense....

June 28, 2021 - The UNJ external threads have a larger root radius than a standard thread pitch. This ultimately improves the tensile stress area of the fastener, making the threads stronger.

July 3, 2007 - Has anyone done this before?Seems the easiest thing to do is to buy some UNJ taps but the alternative method did sound interesting. ... I was faced with a J thread a while back. All I had to do was the tapped hole. It was a class 3 with a larger minor dia.(.1596/.1675 for a 10-32).

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External UNJ threads per SAE AS8879 have a rounded controlled root radius at the minor diameter. The minimum root radius is calculated at 0.15011p and the maximum root radius is calculated at 0.18042p.

The UNJ thread is an inch-based thread standard used in the aerospace industry, also known as ISO 3161.

It specifies the characteristics of the UNJ inch series of threads having 0.15011P to 0.18042P designed radius at the root of the external thread, and also having the minor diameter of the external and internal threads increased above the ASME ...

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January 26, 2017 - All these 3″-16 UNJ thread gages need custom production, plug gauges need one week to finish, ring gauges need two weeks to finish.

February 1, 1977 - a UNJ threads, with controlled root radius, for aerospace -

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Q: I have a customer requesting a UNJF thread for his Aerospace application. How are these different from a UNF thread? A: This is a great question as UNJ threaded bolts are not interchangeable with a standard UN, UNC, or UNF nut. An internal UNJ thread will assemble to a standard …

UNJEF Thread Series, is applicable where extra finer pitches of threads are desirable, especially for aerospace application which require controlled root radius, as for short lengths of engagement and for thin-walled tubes, nuts, ferrules, or couplings.

January 26, 2017 - We are 4.25-12 UNJ thread ring plug gauge 3A 3B, 4 1/4-12 UNJ thread gage GO NOGO supplier. Each gage 100% calibrated with quality assurance.