What is the difference between N mounting and J mounting for door pulls

Both the N and J mounting are the same type of mounting in that they are both back to back mountings, but they are different sizes.  The J mounting uses a size 5/16-18 screw, while the N mounting uses a 3/8-16 screw.

Please reference the pulls section of the Ives catalog linked here to confirm which pulls require N or J for back to back mounting.

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