The Drill Collars are made of AISI 4145 H or 4145 H Modified alloy steel. Its bore are trepanned from one direction with no mismatch. All drill collars are heat-treated with hardness within 285 to 341 BHN, which are guaranteed one inch below the surface of the pipe. When order, pls specify: - Type (slick or spiral grooved) - Outside and inside diameters and overall length - Connection size and type - API Stress relief groove on pin and box ends - Cast or pressed steel thread protectors - Elevator recess or not - Hard-banding or notDATA SHEET FOR SLICK TYPE DRILL COLLAR Size (in) Bore (in) Connection Weight (lb) Size (in) Bore (in) Connection Connection 30 ft 31 ft 30 ft 31 ft 3 1/8 1 1/4 NC23 651.2 673.2 6 3/4 2 1/4 4IF 3132.8 3207.6 3 1/4 1 1/4 NC23 715 739.2 7 2 13/16 41/2IF 3258.2 3366 3 1/2 1 1/2 2 3/81F 787.6 814 7 1/4 2 13/16 41/2IF 35354 3654.2 4 1/8 2 2 7/81F 1031.8 1067 7 1/2 2 13/16 41/2IF 3830.2 3957.8 4 1/4 2 2 7/81F 1119.8 1157.2 7 3/4 2 13/16 6 5/8 Reg 4129.4 4268 4 1/2 2 2 7/81F 1287 1331 8 2 13/16 6 5/8 Reg 4439.6 4587 4 3/4 2 1/4 NC35 1383.8 1430 8 1/4 2 13/16 6 5/8 Reg 4769.6 4928 5 2 1/4 31/21F 1575.2 1628 8 1/2 2 13/16 6 5/8 Reg 5093 5262.4 5 1/4 2 1/4 3 1/21F 1784.2 1843.6 8 3/4 2 13/16 6 5/8 Reg 5440.6 5621 5 1/2 2 1/4 31/21F 1991 2057 9 3 7 5/8 Reg 5695.8 5885 5 3/4 2 1/4 4FH 2219.8 2294.6 9 1/4 3 7 5/8 Reg 6067.6 6270 6 2 1/4 NC44 2450.8 2532.2 9 1/2 3 7 5/8 Reg 6430.6 6644 6 1/4 2 1/4 41F 2692.8 2783 9 3/4 3 7 5/8 Reg 6815.6 7040 6 1/2 2 1/4 41F 2948 3047 10 3 8 5/8 Reg 7207.2 7447
