PART NO. THREAD DIMENSIONS E F A B S1 S2 6S9-04 G1/4"X19 G1/4"X19 29 50 19 19 6S9-06 G3/8"X19 G3/8"X19 33 52 22 22 6S9-08 G1/2"X14 G1/2"X14 40.5 61.5 27 27 6S9-12 G3/4"X14 G3/4"X14 45.5 66 33 32 6S9-16 G1"X11 G1"X11 53 77 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 6S9-16LN