The utility model discloses a bolt hole for elevating system, bolt hole include mid portion, go up marginal part and lower marginal part. The difference more than or equal to installation clearance of mid portion's diameter and pin shaft's diameter. Go up marginal part and the difference less than or equal to correction clearance of lower marginal part with pin shaft's diameter. Mid portion is the partly of first circle, goes up marginal part partly for the second circle, and the centre of a circle of second circle lies in the top in the centre of a circle of first circle, and lower marginal part is some of third circle, and the round centre of a circle of third lies in the below in the centre of a circle of first circle. The utility model discloses a bolt hole has reduced last diameter along subtotal lower edge part for go up the diameter that is close to pin shaft more along the partial diameter of subtotal lower edge, make pin shaft can have the higher goodness of fit when the atress, promoted the ability of rectifying a deviation, avoided because the bolt hole edge that the pin shaft skew led to the fact is out of shape the dead problem of pin shaft card that makes.