| Customization: | Available |
|---|---|
| After-sales Service: | 24/7 |
| Warranty: | 1 Year |
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Introducing the API 7-1 NMDC Non-Magnetic Drill Collars by GPE Oil Machinery Co., Ltd. These non-magnetic drill collars are perfect for well drilling, offering a spiral design and a heavier weight. Available in size 3.1/2", these drill collars are a reliable choice for your drilling needs.
Introducing the high-quality drill collars from GPE Oil Machinery Co., Ltd. Made of modified AISI 4145H chromium molybdenum alloy steel, these drill collar bars are designed to deliver exceptional performance in drilling operations.
Our drill collar bars undergo a full-length heat treatment and water quenching process to obtain ASTM A-370 mechanical properties, ensuring their durability and strength. To guarantee the quality, we provide full mechanical and chemical mill test certifications with every drill collar.
These mill test certifications confirm a hardness range of 285 to 341 BHN and an impressive impact value of 40 ft.-lbs. at room temperature, one inch below the surface. With these specifications, our drill collars are built to withstand the toughest drilling conditions.
To ensure close tolerance bores, all drill collar bars are trepanned and drifted to API specifications. This meticulous process guarantees precision and accuracy in the drilling operation. The bar surface finish is "as rolled," maintaining the original mill finish for optimal performance.
Choose GPE Oil Machinery Co., Ltd for reliable and high-quality drill collars that meet industry standards. Enhance your drilling operations with our durable and precision-engineered drill collar bars.
| Connections | ODmm | IDmm | Lengthmm | |
| NC23-31 | 79.4 | 31.8 | 9150 | |
| NC26-35 | 88.9 | 38.1 | 9150 | |
| NC31-41 | 104.8 | 50.8 | 9150 or 9450 | |
| NC35-47 | 120.7 | 50.8 | 915 or 9450 | |
| NC38-50 | 127 | 57.2 | 9150 or 9450 | |
| NC44-60 | 152.4 | 57.2 | 9150 or 9450 | |
| NC44-60 | 152.4 | 71.4 | 9150 or 9450 | |
| NC44-62 | 158.8 | 57.2 | 9150 or 9450 | |
| NC46-62 | 158.8 | 71.4 | 9150 or 9450 | |
| NC46-65 | 165.1 | 57.2 | 9150 or 9450 | |
| NC46-65 | 165.1 | 71.4 | 9150 or 9450 | |
| NC46-67 | 171.4 | 57.2 | 9150 or 9450 | |
| NC50-67 | 171.4 | 71.4 | 9150 or 9450 | |
| NC50-70 | 177.8 | 57.2 | 9150 or 9450 | |
| NC50-70 | 177.8 | 71.4 | 9150 or 9450 | |
| NC50-72 | 184.2 | 71.4 | 9150 or 9450 | |
| NC56-77 | 196.8 | 71.4 | 9150 or 9450 | |
| NC56-80 | 203.2 | 71.4 | 9150 or 9450 | |
| 6 5/8REG | 209.6 | 71.4 | 9150 or 9450 | |
| NC61-90 | 228.6 | 71.4 | 9150 or 9450 | |
| 7 5/8REG | 241.3 | 76.2 | 9150 or 9450 | |
| NC70-97 | 247.6 | 76.2 | 9150 or 9450 | |
| NC70-100 | 254 | 76.2 | 9150 or 9450 | |
| 8 5/8REG | 279.4 | 76.2 | 9150 or 9450 | |
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