double-end stud with equal-length threads
等变速喷嘴 nozzle with iso-variable velocity 等长双头螺柱 double-end stud with equal-length threads 等分涨缩槽 equal distributed contractible and expandable slots ..
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double-end stud with equal-length threads
等长度螺纹的双头螺柱
以上为机器翻译结果，长、整句建议使用 人工翻译 。