| 摘要 |
A ratchet tool includes a head with an engaging ring rotatably received therein and a pawl is movably received in the head. The engaging ring has first teeth defined in an outer periphery thereof and the pawl has second teeth defined in a side thereof, the first teeth are engaged with the second teeth. An adjust angle "a" defined between a center of the engaging ring and two points of two adjacent first teeth of the engaging ring is 2 to 4 degrees. An angle "b" between two adjacent face of two adjacent second teeth 51 is larger than an angle "c" between two faces of any first tooth. A height "D" of any of the first teeth is not less than a height "d" of any of the second teeth. By the arrangement, the number of the engagement of the first and second teeth is enough to output a largest torque without slipping over or being damaged.
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