铰制孔 meaning in Chinese

reamed hole

Hexagon fit bolts with split pin hole on shank - product grade a and b
六角头螺杆带孔铰制孔用螺栓
Hexagon fit bolts - product grade a and b
六角头铰制孔用螺栓
In the design of articulation hole bolt , the blur variable and random variable existing at the same time , the blur reliability design method of shear strength and extruding strength are approached
探讨了在铰制孔用螺栓设计中，模糊变量与随机变量同时存在时，抗剪强度与挤压强度的模糊可靠性设计方法。