chnical characteristic Adopting the advanced production line crack detecting, quenching, the continuous overall tempering and sand blasting processes to achieve higher mechanical strength ability with overall good performance. 1The thread is cut by the special-purpose numerical control lathe which keeps the rod body still when cutting the threads. The special process could ensure the high precision of the thread with better reliability and life-span. 2Coupling phosphor or copper coated to achieve good wearing-resistance ability and anti-thread gluing ability. Tubing Size in OD in(mm) Wall in(mm) Grade Length ft(mm) Stand ard EUE 23/8 2.375 (60.33) 2.594 (65.90) 0.190(4.83) J55 N80 L80 C90 T95 P110 2832(85309750) 27/8 2.875 (73.03) 3.094 (78.60) 0.217(5.51) 31/2 3.500 (88.90) 3.750 (95.20) 0.254(6.45) Coupling Size in OD in(mm) Min Length in(mm) Grade End Width in(mm) Weight lbs(kg) Standard EUE Standard EUE Standard EUE Standard EUE 23/8 2.875(73.03) 3.063 (77.80) 41/4 (107.95) 47/8 (123.83) J55 N80 L80 C90 T95 P110 3/16 (4.76) 3/16 (4.76) 2.82 (1.28) 3.43 (1.55) 27/8 3.500(88.90) 3.668 (93.20) 51/8 (130.18) 51/4 (133.35) 7/32 (5.56) 5.15 (2.34) 5.29 (2.40) 31/2 4.250(108.00) 4.500 (114.30) 55/8 (142.88) 53/4 (146.05) 1/4 (6.35) 8.17(3.71) 9.03(4.10)