PART NO. THREAD DIMENSIONS E F G A B C S1 S2 CTTB-04SP R1/4"X19 R1/4"X19 G1/4"X19 25.5 25.5 5.5 14 14 CTTB-06SP R3/8"X19 R3/8"X19 G3/8"X19 28.5 28.5 6.3 16 16 CTTB-08SP R1/2"X14 R1/2"X14 G1/2"X14 36 36 7.5 22 22 CTTB-12SP R3/4"X14 R3/4"X14 G3/4"X14 43.5 43.5 10.9 27 27 CTTB-16SP R1"X11 R1"X11 G1"X11 50 50 11.7 33 33 CTTB-20SP R1.1/4"X11 R1.1/4"X11 G1.1/4"X11 56.5 56.5 11 41 41