I'll tell you a few better ones, depending on your batch size.

If it's big, 1. You can find Zhejiang Jinyi Industry, which is famous all over the country and the world. Its products are relatively expensive, but the quality is particularly stable. His subsidiary company specializes in automobile standard parts, and the quality is fine. 2, you can find Ningbo Donggang, whose 1.9-grade bolts are also very good, the quality and price are relatively suitable, and now it is relatively good in China. 3. Hadiwei, Shanghai, this manufacturer directly provides standard parts to the public. The price is relatively cheap and the quality is ok, which is a little worse than the size and quality of the last two companies. 3, and Ningli, the price is cheaper, the quality is average. 4, Kowloon standard parts, the quality is average and the price is ok.

There are many other manufacturers in the market, but when they are used in automobiles, I suggest using the ones with stable quality. If something goes wrong, it will be difficult to handle. There are also many trading companies in the market that say they can produce even if they don't produce at all. In fact, they are all outsourced processing. You should look carefully and be careful.

There are many suggestions I gave you above, which are relatively good. I hope my suggestions will be helpful to you.