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Seven aspects of screw quality technical requirements

Update:29-06-2018
Summary:

1. The screw material is made of 38CrMoAlA, 40Cr or 45# […]

1. The screw material is made of 38CrMoAlA, 40Cr or 45# steel.
2. The blank of the screw should be forged.
3. After screw roughing, quenching and tempering should be performed. Hardness HB=260-290.
4. The precision of the outer circle after screw finishing shall meet the 8-level accuracy requirement in GB180-79.
5. Roughness of the screw thread part is 100 million yuan: two sides of the thread are not more than 1.6um, and the bottom of the thread groove and the outer circle are not more than 0.8pm.
6. Thread surface nitriding, nitride layer depth of 0.3 ~ 0.6mm hardness HV = 700 ~ 8400
7. The screw brittleness is not more than 2 grades.

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