PURPOSE: A bolt connection tool is provided to improve the safety and the accuracy of all sorts of industrial machines requiring accurate connecting power. CONSTITUTION: A bolt connection tool comprises:a bolt connection groove(11) corresponding to a bolt(1) to measure; a measurement socket(10) having a spiral part(12) on one side; a body(20) connected with the spiral part and having a handle(21) formed to be expanded on one side; and a friction coefficient regulator(30) installed on the outer side of the measurement socket exposed to keep the frictional power regularly on the part contacted with a corresponding object.
