Impact wrench

An impact wrench, comprising:

• a motor including a rotor rotatable about a rotation axis extending in a front-rear direction;
• a spindle rotatable with a rotational force from the rotor;
• an anvil located frontward from at least a part of the spindle, the anvil including
• an anvil shaft extending in an axial direction parallel to the rotation axis, the anvil shaft including
• a first shaft having a circular cross section orthogonal to the rotation axis,
• a second shaft located frontward from the first shaft and having a rectangular cross section orthogonal to the rotation axis, the second shaft including
• four flat portions each having
• a first edge at an end of the flat portion in a first circumferential direction of the rotation axis, and
• a second edge at an end of the flat portion in a second circumferential direction of the rotation axis, and
• four flat portion connectors, and
• an intermediate portion between the first shaft and the second shaft, the intermediate portion including, in a plane parallel to each of the four flat portions, a first portion and a second portion, the first portion being located in the first circumferential direction from a center line of a corresponding flat portion of the four flat portions in a circumferential direction and connected to the first edge, the second portion being located in the second circumferential direction from the center line and connected to the second edge, the first portion and the second portion having different shapes, and
• an anvil projection protruding outward from the anvil shaft in a radial direction of the rotation axis;
• and
• a hammer supported by the spindle, the hammer including a hammer projection configured to strike the anvil projection in a rotation direction.

An impact wrench, comprising:

• a motor including a rotor rotatable about a rotation axis extending in a front-rear direction;
• a spindle rotatable with a rotational force from the rotor;
• an anvil located frontward from at least a part of the spindle, the anvil including
• an anvil shaft extending in an axial direction parallel to the rotation axis, the anvil shaft including
• a first shaft having a circular cross section orthogonal to the rotation axis,
• a second shaft located frontward from the first shaft and having a rectangular cross section orthogonal to the rotation axis, the second shaft including
• four flat portions, and
• four flat portion connectors, and
• an intermediate portion between the first shaft and the second shaft, and
• an anvil projection protruding outward from the anvil shaft in a radial direction of the rotation axis;
• a hammer supported by the spindle, the hammer including a hammer projection configured to strike the anvil projection in a rotation direction;
• and
• an anvil bearing supporting the anvil,
• wherein the anvil is a first anvil including the intermediate portion in a first shape or a second anvil including the intermediate portion in a second shape, and
• the anvil bearing supports the first anvil to be replaceable with the second anvil.