| 摘要 |
An open-end wrench includes a jaw portion having two engaging portions and an opening between the engaging portions. Each engaging portion includes a driving face having a tip. A corner is formed between a bottom end of the opening and each driving face. A first length is defined between the bottom end in a direction perpendicular to an imaginary line passing through the tips. A spacing between the tips is larger than 0.95 times the first length and smaller than 1.05 times the first length. Two corners of a fastener received in the opening are located on the imaginary line and flush with the tips. Each engaging portion has a width at an associated corner in a direction perpendicular to an associated driving face. The width is the maximum distance from each driving face to an outer surface of the associated engaging portion. The width is larger than 0.2975 times a width between two parallel sides of the fastener and smaller than 0.4025 times the width of the fastener. |
