The ornamental design for a hand tool handle surface pattern, as shown and described.
The drawing is a layout view of a hand tool handle surface pattern showing my new design.
The dotted line indicates that the surface pattern is repeatable. The surface pattern is shown with uniform size parallelograms as applied to a cylindrical portion of a handle. Where the handle shape is applied to a handle where the exterior surface is in not a constant uniform radial distance away from the axis of the handle, the size of the parallelograms will vary in proportion to their varying radial distance from the axis of the handle.