| Size(inch/mm) | connection thread(API Reg) | Making up Torque(KN.m) | weight(KG) |
| 4 3/4 120.7 | 2 7/8 | 6.1~7.5 | 12 |
| 5 1/2 139.7 | 2 7/8 | 17 | |
| 5 7/8 142.9 | 3 1/2 | 9.5~12.2 | 22 |
| 6 1/2 165.1 | 3 1/2 | 23 | |
| 6 3/4 171.5 | 3 1/2 | 27 | |
| 7 1/2 190.5 | 4 1/2 | 16.3~21.7 | 33 |
| 7 7/8 200 | 4 1/2 | 38 | |
| 8 1/4 209.6 | 4 1/2 | 43 | |
| 8 1/2 215.9 | 4 1/2 | 43 | |
| 8 3/4 222.3 | 4 1/2 | 45 | |
| 9 1/2 241.3 | 6 5/8 | 38~43.4 | 63 |
| 9 7/8 250.8 | 6 5/8 | 65 | |
| 10 5/8 269.9 | 6 5/8 | 80 | |
| 11 5/8 295.3 | 6 5/8 | 95 | |
| 12 1/4 311.2 | 6 5/8 | 106 | |
| 13 3/4 349.3 | 6 5/8 | 130 | |
| 14 5/8 371.5 | 7 5/8 | 46.1~54.2 | 170 |
| 14 3/4 374.7 | 7 5/8 | 170 | |
| 15 1/2 393.7 | 7 5/8 | 200 | |
| 17 1/2 444.5 | 7 5/8 | 270 | |
| 20 508 | 7 5/8 | 470 | |
| 22 558.8 | 7 5/8 | 590 |
| IADC | Rok Formation | WOB (KN/mm) | RPM(r/min) |
| 417/427/437 | Low compressive strength, high drill-ability and extremely soft formation, like shale, clay, sandstone, conglomerate etc | 0.35~0.90 | 140~70 |
| 447 | Low compressive strength, high drill-ability and soft formation, like shale, clay, sandstone, soft limestone, salt rock, plaster etc. | 0.37~1.00 | 140~60 |
| 517 | Low compressive strength, high drill-ability and soft formation, like shale, clay, sandstone, soft limestone, salt rock, etc | 0.37~1.00 | 120~50 |
| 527 | Soft formation with low compressive, like Low compressive strength, high drill-ability and soft formation, like shale, clay, sandstone, soft limestone, salt rock, anhydrite etc. | 0.35~0.90 | 120~50 |
| 537/547 | Low compressive strength, medium hard formation with hard abrasive interlayer, like Hard shale, anhydrite, soft limestone, sandstone, dolomite with mezzanine, etc. | 0.50~1.05 | 110~40 |
| 617/627 | High compressive strength, medium hard and thick hard interlayer, like hard shale, limestone, sandstone, dolomite, etc. | 0.50~1.05 | 80~40 |
| 637/737 | High compressive strength, medium hard and high abrasive formation, like limestone, dolomite, sandstone, chert, etc. | 0.70~1.20 | 70~40 |
Q: Are you a manufacturer or trading company?
A: We are a specialized manufacturer.
Q: What are your main products, and used for?
A: Our products include core barrel, casing, drill rod, drill rig and other drilling parts.They are used for mineral exploration,
geological drilling.
Q: How about the delivery terms?
A: 1.Payment: T/T, L/C, Western Union, Paypal, 30% deposit in advance and rest before delivery
2. Min. order quantity: 1 piece.
3. Transportation: By sea, train.
Q: How about discount?
A: Price is based on products and order quantity.
Q: Do you accept sample order?
A: Yes sure, please contact us for details.
Q: How about your after-sales service?
A: As a manufacturer has 35 years of history we offer prompt technology support for all problems and questions. Besides, we accept
goods return or replace for quality problem.
Q: Where is your factory located in?
A: Our factory is located in Jinzhou city, Hebei province, China.
Q: How does your company control the quality?
A: Quality first. In order to guarantee high quality for our products, our always make a serious inspection for all products and raw materials in strict procedure.
