The six-party drill pipe is made from AISI4145HMOD alloy steel According to API Spec.7 -1. IT is formed by hot forged and fully heat-treated by intermediate frequency induction heat treatment or 20m horizontal optical resistance furnace to threads are phosphated, copperrized or cold worked. Â Standard size of hexagonal kelly;Each can reach a total length of 27 meters. Kelly size Length drive section Length overall Length drive section LD Standard LD Optional L standard L optional DFL Across flate DC Across cornere DCC Across cornere Rc Radlue Rcc Radlue Wall thickness eccentric bore 76.2 3 11280 12190 76.2 85.7 85.73 6.4 42.9 12.1 88.9 3 1/2 11280 Â 12190 88.9 100.8 100.0 6.4 50.0 13.3 108.0 4 1/4 11280 15540 12190 16460 108.0 122.2 121.4 9.9 60.7 15.9 Â 133.4 5 1/4 11280 15540 12190 16460 133.4 151.6 149.86 9.9 75.0 15.9 Â 133.4 5 1/4 11280 15540 12190 16460 133.4 175.4 171.45 15.9 85.7 15.88 152.4 6 11280 15540 12190 16460 152.4 173.0 173.02 9.5 86.5 15.9 Â 152.4 6 11280 15540 12190 16460 152.4 173.0 173.02 9.5 86.5 15.9 Â Upper box connection Thread size and style LF O.D. Bevel diameter Standard optional DU standard DU optional LU DF Standard DF optional 6 5/8 REG 4 1/2 REG 196.9 146.1 406.4 186.1 134.5 6 5/8 REG 4 1/2 REG 196.9 146.1 406.4 186.1 134.5 6 5/8 REG 4 1/2 REG 196.9 146.1 406.4 186.1 134.5 6 5/8 REG 196.9 Â 406.4 186.1 Â Lower pin connection I.D. Label O.D. LL DF Bevel diameter NC26 85.7 508 82.9 31.8 Â NC31 104.8 508 100.4 44.5 NC38 120.7 508 116.3 57.2 NC46 158.8 508 145.3 71.4 NC50 161.9 508 154.0 71.4 5 1/2 FH 177.8 508 170.7 82.6 NC56 177.8 508 171.7 82.6
