PART NO. THREAD DIMENSIONS E F G A B C S1 HT-02 Rc1/8"X28 Rc1/8"X28 Rc1/8"X28 20 20 24 16 HT-04 Rc1/4"X19 Rc1/4"X19 R1/4"X19 25 25 28 19 HT-06 Rc3/8"X19 Rc3/8"X19 R3/8"X19 27 27 33.5 24 HT-08 Rc1/2"X14 Rc1/2"X14 R1/2"X14 31.2 31.2 40.8 30 HT-12 Rc3/4"X14 Rc3/4"X14 R3/4"X14 37 37 47.5 33