A ratchet is a mechanical gadget that allows continuous linear or rotary motion in mere one direction while avoiding motion in the contrary direction. Ratchets are trusted in Ratchets Wheel machinery and equipment. A rachet contains a round gear or a linear rack with teeth, and a pivoting, spring-loaded finger called a pawl (or click, in clocks and watches[1][2]) that engages one’s teeth. The teeth are uniform but asymmetrical, with each tooth having a moderate slope on one advantage and a much steeper slope on the additional edge.
When one’s teeth are moving in the unrestricted (i.electronic. forward) direction, the pawl easily slides up and over the carefully sloped edges of the teeth, with a springtime forcing it (frequently with an audible 
‘click’) into the depression between your teeth since it passes the suggestion of each tooth. When one’s teeth move in the opposite (backward) direction, however, the pawl will capture against the steeply sloped edge of the first tooth it encounters, therefore locking it against the tooth and preventing any further motion for the reason that direction.
Specifications
Angle of teeth 60°
Material S45C
Heat treatment Induction hardened teeth
Tooth hardness 50 ～ 60HRC