Yonglong prides itself of quality parts proudly manufactured in China. We aim to constantly improve our processes to ultimately increase customer satisfaction. Below you can find our ISO certifications.

Our testing instrument including penetration detector, Brinell hardness machine, Salt spray chamber, etd. Each batch of products be test by our inspectors, for those special requirements we could not finish by our in-house testing, they will be finished in the third-party testing organization.