我们的螺纹型芯杆径部分采用顶心磨研磨加工，一次装夹整刀磨出，确保轴前后端同轴度在0.01以内，有效避免零件卡死，打摆等不良现象。

We apply centring mould to grind the core pin, just clamping once, to ensure the axiality is below 0.01.effectively prevent the parts from being stuck or shaking.