FIELD: mechanical engineering.
SUBSTANCE: threaded connection comprises pin and coupling that have contact surface including section provided with thread and metallic contact section without thread that prevents wearing due to screwing and unscrewing without lubricating. The solid lubricating film is applied on the pin and coupling. The film is first heated up to a temperature of 70-150°C and then is heated up to a temperature of 150-380°C.
EFFECT: enhanced reliability.
4 cl, 16 dwg
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