Thread Check provides information on UNJ and UN threaded product compatibility. Contact us for additional details on UNJ thread and gage requirements.

Also known as JIC (Joint Industrial Council) fittings, these provide a tight seal on tubing that is flared to 37°. Choose from our selection of UNJ/UNJF (JIC) tube fittings, including over 275 products in a wide range of styles and sizes. Same and Next Day Delivery.

2005年4月26日 · UNJ Bolt into UN Nut = In most cases an interference fit at the thread minor diameter; functional problems are possible.* The only difference between the internal UNJ thread and the standard UN threaded is that the UNJ thread has a larger minor diameter.

INCH SCREW THREADS - UNJ PROFILE: Controlled Root Radius with Increased Minor Diameter 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 …

UNJ bolts are like UNR, but the curve of the bolt thread root is even more gentle which requires the thread root to be shallower. In fact, the thread root is so shallow that the bolt thread cannot mate with a UN nut, so there is a UNJ nut specification as well.

2025年2月8日 · Defines thread specifications, including UNC (Unified National Coarse) and UN8 (8 threads per inch), commonly used for stud bolts. Download the ASME B1.1 pdf standard here. This Standard specifies the thread form, series, class, allowance, tolerance, and designation for unified screw threads.

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. MIL-S-8879 was primarily thought of an used for aerospace fastener and threaded component applications.

1991年7月25日 · Unlike the UNR thread series, which does not define a nut, the UNJ series includes specifications for internal threading, as of nuts. The UNJ GO ring gage accomodates a larger minor diameter than the UN GO gage; a UN GO ring gage will reject a UNJ bolt. The GO ring gage is the only gage in which the UNJ model differs from the UN model.

The Special UNJ threads are designated by the nomenclature UNJS. J screw threads feature a root radius which improves the tensile stress area of the fastener and helps to reduce the stress concentration factor in the thread thus making the thread stronger.

2024年12月1日 · UNJ Bolt (external) into UN Nut (external) = Compatibility Issue – In most cases an interference fit at the thread minor may have minor diameter interference and functional assembly issues.* *The two threads are not designed to be used as an assembly connection.