rondelle à denture extérieure
/ˈvɛn ʒyɡylˈɛʁ ɛkstˈɛʁn/
n
English: external tooth lock washer · 外齿锁紧垫圈
Sens：Washer having protuberances on the outside so that a screw tightens securely and will not loosen.
English: external tooth lock washer · 外齿锁紧垫圈