У меня тоже такое было, но правда я пол витка с резбы отодрал от переходника вместе с гайкой. В чем причина не понял- толи у переходников диаметр большой, толи материал гомно и когда в резьбу попадает грязь ее заминает и все идет в разнос. В итоге я просто на переходники только гайки от MCD накручиваю. У них диаметр внутренний на долю миллиметра побольше, поэтому теоритически грязь попадая в резьбу просто проскакивает. Резьбу ни на переходниках ни на гайках еще не сорвал, как сильно бы я не закручивал.
В итоге заказал я этих несчастных переходников еще пару что стоило 920р в переводе с Евро
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