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Spiral Drill Collars by using AISI 4145H chromium molybdenum steel, execute API Specification 7 and SY / T5144 standard,which can be cold thread rolling, copper or phosphate processing, machine double shoulder screw and other specifications special thread.We can produce a maximum outside diameter of 14 inches spiral drill collars.
| 外径D | 切削深度A mm | 导程±25.4 mm | 切削深度B mm | |
| mm | in | |||
| 98.4 | 3 7/8 | 4.0±0.79 | 914 | |
| 101.6~111.1 | 4~4 3/8 | 4.8±0.79 | 914 | |
| 114.3~130.2 | 4 1/2~5 1/8 | 5.6±0.79 | 965 | |
| 133.4~146.1 | 5 1/4~5 3/4 | 6.4±0.79 | 1067 | |
| 149.2~161.9 | 5 7/8~6 3/8 | 7.1±1.59 | 1067 | |
| 165.1~177.8 | 6 1/2~7 | 7.9±1.59 | 1168 | |
| 181.0~200.0 | 7 1/8~7 7/8 | 8.7±1.59 | 1626 | 5.6±0.79 |
| 203.2~225.4 | 8~8 7/8 | 9.5±1.59 | 1727 | 6.4±0.79 |
| 228.6~250.8 | 9~9 7/8 | 10.3±2.37 | 1829 | 7.1±1.59 |
| 254.0~276.2 | 10~10 7/8 | 11.1±2.37 | 1930 | 7.9±1.59 |
| 279.4 | 11 | 11.9±2.37 | 2037 | 8.7±1.59 |
| 注：螺旋钻铤有3个螺旋槽，右旋，均布 | ||||
