serrated lock washer 锯齿垫圈 internal teeth serrated lock washer 内锯齿锁紧垫圈 external teeth serrated lock washer 外锯齿锁紧垫圈 ..
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internal teeth serrated lock washer 内锯齿锁紧垫圈
external teeth serrated lock washer 外锯齿锁紧垫圈
serrated lock washer external teeth 外齿弹性垫圈
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