Integral heavy weight drill pipe is made from AISI 4145H alloy steel.acc.to API Spec.7 and SY/T5144. It is formed by hot forged and fully heat-treated.There is wear resistance hard banding on tool joints connections and central upset.The types of hard banding include Arno 100XT and 300XT. All threads are phosphated,copperized or cold worked. All connections are equipped with pressed steel thread protectors. All threads are machined with CNC Lathes-Double-Shouldered and special threads. Integral Heavy Weight Drill Pipe Size Specification OD C ID E Connection Body Weight kg Style OD A Inner and outer thread DFmm Upset Center area Dmm End area Bmm mm in mm in Itype(9300mm) ZH-JZ55- 51/2FH-I 139.7 51/2 51/2FH 92.1 35/8 170.7 152.4 144.5 730 ZH-JZ50- NC50-I 127.0 5 NC50 (41/2IF) 76.2 3 154.0 139.7 130.2 700 ZH-JZ45- NC46-I 114.3 41/2 NC46 (4IF) 71.4 2 13/16 145.3 127.0 117.5 585