Key seat Wiper

 滑套式键槽扩大器由芯轴和滑套两部分组成，滑套由两半合圆组焊在芯轴上，可以在芯轴上上下活动和转动。在滑套上堆焊三组三条螺旋形硬质合金棱。滑套上端有一对锯齿形牙嵌，与上接头下端的锯齿牙嵌相配。当滑套卡入键槽后，加压正转时可以产生向下的震击作用使滑套解卡。滑套下部的一对锯齿形牙嵌与下接头上端面的牙嵌相配，可以在键槽处施加一定拉力进行倒划眼，以破坏键槽。

Key seats develop during the drilling process whenever deviation or major changes in direction occur. Use MZS Key seat Wiper in these conditions will save you from costly fishing jobs and downtime. The key seat reaming tool is a sleeve with five blades dressed with an aggressive tungsten carbide hardfacing.