All of our orders will be inspected by our QC team. We will check the quality during the production time .Also check the quality before ship ping.
1. Before production, we will use spectrometer to test raw material to prevent mistakes
2.Every step QC department will record , such as raw material cutting dimension, semi-finished product size, quantity , finished item detailed size
3.Before delivery ,detailed inspection report of finished products will present.

4. Beside size, we will check 10% to 20% of total quantity products whether have thread broken,greasy, marking,packing etc.
5.Before delivery ,we will provide our mill test certificate together with inspection report.

6.Our mechanical property always shows tensile strength, yield strength, elongation, hardness, if you need more, just let us know in advance.

The drawing of hexagon bolts:

For more details ,pls kindly contact Stephan Lee ! I am here waiting for your any questions !