PART NO. THREAD DIMENSIONS E F G A B C S1 AT-02SP R1/8"X28 R1/8"X28 R1/8"X28 21 21 21 11 AT-04SP R1/4"X19 R1/4"X19 R1/4"X19 25.5 25.5 25.5 14 AT-06SP R3/8"X19 R3/8"X19 R3/8"X19 28.5 28.5 28.5 16 AT-08SP R1/2"X14 R1/2"X14 R1/2"X14 36 36 36 22 AT-12SP R3/4"X14 R3/4"X14 R3/4"X14 43.5 43.5 43.5 27 AT-16SP R1"X11 R1"X11 R1"X11 50 50 50 33 AT-20SP R1.1/4"X11 R1.1/4"X11 R1.1/4"X11 57.5 57.5 57.5 41 AT-24SP R1.1/2"X11 R1.1/2"X11 R1.1/2"X11 62.5 62.5 62.5 48 AT-32SP R2"X11 R2"X11 R2"X11 75 75 75 63