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Re: Special Threads - UNJC
Re: Special Threads - UNJC -- Mick Waller Post Reply Top of thread Forum
Posted by: Jim Disharoon

04/22/2003, 16:50:32

UNJC usually only applies to class 3 thread fits.The 'J' requires a 'reduced root radius' that essentially provides a stronger thread profile, less like to break at the root radius.Usually 'J' threads are only used in aircraft applications and in FINE thread configurations: eg. UNJF-3ACoarse threads with the 'J' configuration are unusual: if an assembly requires a higher strength thread configuration, it would require a a fine thread with more thread engagement which would also provide greater 'strength'.Yes, nuts are and can be produced with the 'J' thread configuration: eg. UNJF-3BTypical standard items are 'MS'(military specification) higher tensile nuts, and lock nuts.Jim DisharoonTranSpec Fasteners

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