An auto adjustable spanner hand tool system, adjustable drivetrain tool apparatus with auto adjustable spanner feature, and methods of use are presented. The disclosure provides an interchangeable head system for a spin spanner which automatically engages and disengages a target. The interchangeable head system also activates to spin. The system includes a spring loaded ratchet mechanism which allows the pin to rotate both clockwise and counterclockwise to engage and disengage smoothly. Furthermore, the ratchet assembly is designed to accommodate standard nut dimensions at particular locking points, when needed.

An auto adjustable spanner hand tool system, adjustable drivetrain tool apparatus with auto adjustable spanner feature, and methods of use are presented. The disclosure provides an interchangeable head system for a spin spanner which automatically engages and disengages a target. The interchangeable head system also activates to spin. The system includes a spring loaded ratchet mechanism which allows the pin to rotate both clockwise and counterclockwise to engage and disengage smoothly. Furthermore, the ratchet assembly is designed to accommodate standard nut dimensions at particular locking points, when needed.

The pinch clamp has a ratchet mechanism for selectively securing two jaw assemblies of the pinch clamp together. The ratchet mechanism includes a ratchet with a plurality of notches fixedly mounted on an end of one jaw assembly and a pawl member integrally mounted on an end of the other jaw assembly for selectively engaging in one of the notches of the ratchet. A finger release portion extends integrally from the pawl member for moving the pawl member from engagement with the ratchet.

A wrench includes a ratchet unit located in the head and includes a mount hole. A collar is connected to the head and located corresponding to the mount hole. The collar includes a slot and an aperture. A C-shaped engaging member includes a first end thereof inserted into the aperture. A second end of the engaging member protrudes beyond the collar. The engaging member includes a curved section which is resiliently inserted into the slot. A rotary member is mounted to outer periphery of the collar and includes a notch defined in the underside thereof. The second end of the engaging member is located in the notch and covered by the rotary member. When the rotary member is rotated, the engaging member is deformed to insert or remove the curved section relative to the mount hole via the slot to position a socket in the head of the wrench.

A wrench includes a ratchet unit located in the head and includes a mount hole. A collar is connected to the head and located corresponding to the mount hole. The collar includes a slot and an aperture. A C-shaped engaging member includes a first end thereof inserted into the aperture. A second end of the engaging member protrudes beyond the collar. The engaging member includes a curved section which is resiliently inserted into the slot. A rotary member is mounted to outer periphery of the collar and includes a notch defined in the underside thereof. The second end of the engaging member is located in the notch and covered by the rotary member. When the rotary member is rotated, the engaging member is deformed to insert or remove the curved section relative to the mount hole via the slot to position a socket in the head of the wrench.

A pipe wrench structure with a secure positioning function includes a main body, an engaging portion including a pivot point, an upper jaw and a lower jaw for performing an opening/closing operation, a pipe being placed between the upper and lower jaws while clamping the pipe; an elastic restoring member, installed to the upper and lower jaws and configured to be corresponsive to the pivot point, and provided for providing a pressing force to the upper jaw; an auxiliary ratchet surface, disposed at the lower jaw; an arc ratchet surface, disposed on an inner side of the upper jaw opposite to the lower jaw, and being in form of concave arc surface without an included angle, and the curvature of the arc ratchet surface being greater than the external periphery of the pipe.