NMDC, Non-Magnetic Drill Collar, Spiral Drill Collar, Slick Drill Collar

OD ID Length mm Bevel Diameter mm Connection Bending Strength Ratio in mm in mm 3-1/8 79.4 1-1/4 31.8 9150 76.2 NC23-31 2.57: 1 3-1/2 88.9 1-1/2 38.1 9150 82.9 NC26-35 ( 21/8IF) 2.42 :1 4-1/8 104.8 2 50.8 9150 100.4 NC31-41  ( 27/8IF ) 2.43 :1 4-3/4 120.7 2 50.8 9150 114.7 NC35-47 2.58 :1 5 127 2-1/4 57.2 9150 121.0 NC38-50  ( 31/2IF ) 2.38:1 6 152.4 2-1/4 57.2 9150 or 9450 144.5 NC44-60 2.49:1 6 152.4 2-13/16 71.4 9150 or9450 144.5 NC44-60 2.84:1 6-1/4 158.8 2-1/4 57.2 9150 or 9450 149.2 NC44-62 2.91:1 6-1/4 158.8 2-13/16 71.4 9150 or 9450 150.0 NC46-62 ( 4IF ) 2.63:1 6-1/2 165.1 2-1/4 57.2 9150 or 9450 154.8 NC46-65 ( 4IF) 2.76:1 6-1/2 165.1 2-13/16 71.4 9150 or 9450 154.8 NC46-65 ( 4IF ) 3.05:1 6-3/4 171.4 2-1/4 57.2 9150 or 9450 159.5 NC46-67 ( 4IF ) 3.18:1 6-3/4 171.4 2-13/16 71.4 9150 or 9450 159.5 NC50-67( 41/2IF ) 2.37:1 7 177.8 2-1/4 57.2 9150 or 9450 164.7 NC50-70 ( 41/2IF ) 2.54 :1 7 177.8 2-13/16 71.4 9150 or 9450 164.7 NC50-70( 41/2IF ) 2.73 :1 7-1/4 184.2 2-13/16 71.4 9150 or 9450 169.5 NC50-72 ( 41/2IF ) 3.12 :1 7-3/4 196.8 2-13/16 71.4 9150 or 9450 185.3 NC56-77 2.70 :1 8 203.2 2-13/16 71.4 9150 or 9450 190.1 NC56-80 3.02 :1 8-1/4 209.6 2-13/16 71.4 9150 or 9450 195.7 65/8REG 2.93: 1 9 228.6 2-13/16 71.4 9150 or 9450 212.7 NC61-90 3.17 :1 9-1/2 241.3 3 76.2 9150 or 9450 223.8 75/8REG 2.81 :1 9-3/4 247.6 3 76.2 9150 or 9450 232.6 NC70-97 2.57 :1 10 254 3 76.2 9150 or 9450 237.3 NC70-100 2.81: 1 11 279.4 3 76.2 9150 or 9450 266.7 85/8REG 2.84 :1