PART NO. THREAD DIMENSIONS E F A B L S1 S2 6S-04 G1/4"X19 G1/4"X19 15 31 55 19 19 6S-06 G3/8"X19 G3/8"X19 17 32 60 22 22 6S-08 G1/2"X14 G1/2"X14 20 39 71 27 27 6S-12 G3/4"X14 G3/4"X14 21 41 79 32 32 6S-16 G1"X11 G1"X11 23 45 87 41 41 Note: In case if you are interested to order the adapter in complete set with lock nut ,it is necessary to insert suffix "LN" after our part no.,for example 6S-16LN