A ratchet is a mechanical gadget which allows Ratchets Wheel continuous linear or rotary motion in mere one direction while avoiding motion in the contrary direction. Ratchets are widely used in machinery and tools. A rachet consists of 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 the teeth. One’s teeth are uniform but asymmetrical, with each tooth having a moderate slope on one advantage and a much steeper slope on the various other edge.
When one’s teeth are relocating the unrestricted (i.e. forward) direction, the pawl quickly slides up and over the lightly sloped edges of one’s teeth, with a spring forcing it (frequently with an audible ‘click’) in to the depression between your teeth as it passes the suggestion of every tooth. When the teeth move in the contrary (backward) direction, nevertheless, the pawl will catch against the steeply sloped edge of the 1st tooth it encounters, therefore locking it against the tooth and preventing any further motion in that direction.
Specifications
Angle of 
teeth 60°
Material S45C
Heat treatment Induction hardened teeth
Tooth hardness 50 ～ 60HRC