Abstract: A combination bolt sizing tool comprising an upper surface plate, a lower surface plate, a pivot pin, a tensioning wheel and a plurality of bolt-sizer blades. The pivot pin connects the upper surface plate to the lower surface plate. The plurality of bolt-sizer blades are pivotally mounted by the pivot pin such that the free end of each blade may be rotated outward for use and then rotated back between the upper and lower surface plates. The tensioning wheel controls pressure on the blades, making them easier or harder to pivot.The free end of each bolt-sizer blade has a circular cutout of a specified diameter. The specified diameter of each bolt-sizer blade is different than the specified diameter of the circular cut-outs of other bolt-sizer blades. Each blade is visibly marked with the size of its respective circular cutout. The tool may include a second plurality of bolt-sizing blades, held by a second pivot pin, or a plurality of thread-pitch gauges held by the second pivot pin.

Abstract: A method of threading or rethreading a member by the use of a die made up of a plurality of complementary separable interfitting parts held together by a tensional element disposed around the exterior surface thereof which in use are separated from one another under the tension of an abrasing element thereby enabling the die to be passed over the member whereat the separating force is relaxed permitting the parts to re-engage thereon. The die is then turned to effect the cutting of the threads.