10/4/2023 0 Comments Form tap minor diameter chart![]() * Values are calculated for Length of engagement of 5xPitch. Internal threads: the minor diameter is increased to accommodate the maximum root radius of the external thread. * Permisable values for thread Class 2B # Description Value (Inch) Value (mm) D 1 Minor Diameter 0.446 - 0.457 11.328 - 11.608 D 2 Pitch Diameter 0.4675 - 0.4727 11.875 - 12.007 D Major Diameter 0.5000 (Min) 12.7 (Min) α Varation of 30° anngle (+/-) 1.1667 (Ref) 29.634 (Ref) P Varation of Pitch (+/-) 0.0015 (Ref) 0.038 (Ref) UNJ screw threads are the same form as Unified Screw Threads to ASME/ANSI B1.1 except: External threads: the root has a maximum and minimum prescribed continuous radius, and is not merely rounded due to tool wear. ![]() * Permisable values for thread Class 3A # Description Value (Inch) Value (mm) es Allowance 0 (Ref) 0 (Ref) d Major Diameter 0.4919 - 0.5 12.494 - 12.7 d 2 Pitch Diameter 0.4645 - 0.4675 11.798 - 11.875 d 3 Minor Diameter For calculations of different engagement length use the Thread Calculator A common internal thread drilled out so that it contains 100 of full thread is only 5 stronger than a 75 height of thread, yet it requires 3. ![]() A common internal thread, drilled so that it results in 50 of full thread will break the external thread, before the internal thread will strip.
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