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UNJC and UNJF screws are thread standards mainly used in the aircraft industry.
internal thread In machining, UNC and UNF taps or thread mills can be shared.
* UNJC and UNJF often use Class 3B (equivalent to Class 1) as aircraft screws, and it may be difficult to pass the thread accuracy if the tap is a standard tap accuracy aimed at the equivalent of Class 2.
* The pilot hole must be the pilot hole diameter of UNJC / UNJF.