Technical requirements for
1. surface finish, any defects and burr
2. tag word for concave characters not allowed, deep 0.5
3. coaxial each round 0.1 degrees, does not indicate the chamfering 1 * 45 degrees according to the mechanical properties of
4. 10.9 level manufacturing
5. heat treatment; quenching, tempering hardness of HRC32-36
6. surface treatment; Antirust phosphating treatment
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