screw collar nut 螺纹环螺母
feed screw collar 进给螺杆挡环
collar screw 有环螺丝
collar head screw 带缘螺钉 ; 头带缘螺钉 ; 有领螺钉
collar-head screw [机] 环头螺钉
compound feed-screw graduated collar 复刀架丝杠刻度圈
screw graduated collar 复刀架丝杠刻度圈
drill collar screw 钻铤螺纹
The correct countermeasures are taken to prevent the drill collar screw failure effectively, ensuring the qualitative reliability of drill collar screw.
通过采用合适的对策，有效预防钻铤螺纹失效，从而保证钻铤螺纹的质量可靠性。
Lab experiments show that such tubing collar is feasible to some degree in preventing corrosion of the screw thread of water cycling pipe, thus extending the service life of water cycling pipe.
经实验室验证，复合接箍对回注水管柱螺纹防腐具有一定的可行性，可以延长回注水油管柱的整体使用寿命。
As such, magnetic particle inspection for the screw thread of the drill collar is very necessary and important.
因而钻铤内外螺纹的磁粉检测十分必要和重要。
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