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BBC-12F凿岩机上的活塞螺母,过去靠国外进口。1967年开始仿制,不但成本高、加工慢,更主要的是消耗大量铜材,难于解决。在毛主席革命路线的指引下,大庙铁矿广大革命职工本着自力更生的精神,于1971年8月试制成功了尼龙活塞螺母,解决了矿山生产中的一个关键问题。其使用寿命超过国外进口的同类产品,而且价钱便宜。尼龙活塞螺母的寿命是5000～8000米/个,而进口的铜活塞螺母的寿命只有2000米/个;尼龙活塞螺母加工只1小时/个,而铜活塞螺母加工
BBC-12F rock drill on the piston nut, used to be imported abroad. 1967 imitation began, not only high cost, slow processing, more important is the consumption of large quantities of copper, difficult to solve. Guided by Chairman Mao’s revolutionary line, a large number of revolutionary workers in Dayu Iron Mine trial-produced nylon piston nuts in August 1971 in a spirit of self-reliance and solved a key issue in mine production. Its service life than similar foreign products imported, but the price is cheap. Nylon piston nut life is 5000 ~ 8000 m / a, while the life of imported copper piston nut is only 2000 m / a; nylon piston nut processing only 1 hour / month, and the processing of copper piston nut