Description

Drill Collar
The Drill Collars are made of AISI 4145 H or 4145 H Modified alloy steel  Bores 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 inquiry or order, please 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 not
– Non-magnetic or

DATA 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