CSC Production Square Kelly and Hexagonal Kelly
Kelly is a critical component located at the top of the drill string, available in both square and hexagonal designs. In rotary drilling operations, the kelly connects to the square bushing and rotary bushing, transferring the surface rotational torque to the drill pipe and driving the drill bit. It also supports the weight of the entire drill string. In turbine and motor drilling applications, it helps bear the weight and counter-torque of the drill string.
Introduction
Continental Steel Co., Ltd (CSC) offers high-quality square and hexagonal kellys manufactured strictly according to API Spec 7-1 standards. The materials used are AISI 4145H modified alloy steel, fully heat-treated with a Brinell hardness range of 285–341 and a minimum Charpy impact value of 40 ft-lbs. Each kelly bar undergoes ultrasonic inspection across its full length and sections to ensure quality and reliability.
Parameter Table
| Size (in) | Top Connection (LH) | Bottom Connection | I.D. (in) | Drive Section (in) | ||||
| Standard O.D. (in) | Optional O.D. (in) | Square O.D. (in) | Hex. O.D. (in) | Square | Hex. | A | B | |
| 2-1/2 | 6-5/8 REG | 7-3/4 | 4-1/2 REG | 5-3/4 | NC26 | / | 1-1/4 | / | 3-2/7 | / |
| 3 | 6-5/8 REG | 7-3/4 | 4-1/2 REG | 5-3/4 | NC31 | 4-1/8 | NC26 | 3-3/8 | 1-3/4 | 1-1/4 | 4 | 3-3/8 |
| 3-1/2 | 6-5/8 REG | 7-3/4 | 4-1/2 REG | 5-3/4 | NC38 | 4-3/4 | NC31 | 4-1/8 | 2-1/4 | 1-3/4 | 4-1/2 | 4 |
| 4-1/4 | 6-5/8 REG | 7-3/4 | 4-1/2 REG | 5-3/4 | NC46 | 6-1/4 | NC38 | 4-3/4 | 2-4/5 | 2-1/4 | 5-4/7 | 4-4/5 |
| 6-5/8 REG | 7-3/4 | 4-1/2 REG | 5-3/4 | NC50 | 6-3/8 | NC38 | 4-3/4 | 2-4/5 | 2-1/4 | 5-4/7 | 4-4/5 | |
| 5-1/4 | 6-5/8 REG | 7-3/4 | / | 5-1/2 FH | 7 | NC46 | 6-1/4 | 3-1/4 | 3 | 7 | 6 |
| 6-5/8 REG | 7-3/4 | / | NC56 | 7 | NC50 | 6-3/8 | 3-1/4 | 3-1/4 | 7 | 6 | |
| 6 | 6-5/8 REG | 7-3/4 | / | / | 5-1/2 FH | 7 | / | 3-1/2 | / | 6-4/5 |
| 6-5/8 REG | 7-3/4 | / | / | NC56 | 7 | / | 3-1/2 | / | 6-4/5 | |
Whether you're working on land or offshore, our kellys are designed for durability, precision, and performance. With a wide range of sizes and configurations, we can meet your specific drilling needs. Our products are ideal for use in various drilling environments, including conventional rotary drilling, directional drilling, and more. For more information or to place an order, feel free to contact us today.
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