A threaded rod cutter includes a shear assembly and a drive assembly; the shear assembly includes a shear base, a stationary blade, a shear lever, a moving blade, a reset spring, a cam, and a roller; the drive assembly includes an electric motor for driving the cam and a speed reducer; a lower concave surface, an involute surface, and a circular fillet surface connecting the lower concave surface and the involute surface are arranged along a peripheral direction of the cam; when the roller engages the lower concave surface, the threaded rod cutter is in a ready-to-shear state; when the roller rotates past the lower concave surface to engage the involute surface, the involute surface drives the shear lever to swing so that the shear lever drives the moving blade to be fitted with the stationary blade to shear a threaded rod.

A threaded rod cutter includes a shear assembly and a drive assembly; the shear assembly includes a shear base, a stationary blade, a shear lever, a moving blade, a reset spring, a cam, and a roller; the drive assembly includes an electric motor for driving the cam and a speed reducer; a lower concave surface, an involute surface, and a circular fillet surface connecting the lower concave surface and the involute surface are arranged along a peripheral direction of the cam; when the roller engages the lower concave surface, the threaded rod cutter is in a ready-to-shear state; when the roller rotates past the lower concave surface to engage the involute surface, the involute surface drives the shear lever to swing so that the shear lever drives the moving blade to be fitted with the stationary blade to shear a threaded rod.

An example shearing head includes a first member and a second member being rotatable about a pin. The first member has a shearing surface forming a substantially right angle with a first lateral surface of the first member. The second member has a shearing surface forming a substantially right angle with a second lateral surface of the second member. The second member includes a first distal surface and a second distal surface forming a substantially right angle. The first distal surface and the second distal surface are substantially perpendicular to the second lateral surface. The second member includes a third lateral surface opposing the second lateral surface and a retainer is attached to the second member. A first surface of the retainer contacts the first distal surface, a second surface of the retainer contacts the second distal surface, and the third lateral surface contacts a third surface of the retainer.