Learn about ASTM A307 Grade A, SAE J429 Grade 5, and SAE J429 Grade 8 bolts, their specs, and head markings.
website:https://www.jhmindustry.com/
Shanghai Jian & Mei Industry and Trade Co., Ltd. is the company which manufacture and export fasteners and metal hardware, founded in 2006, with import-export authority. Now, 80% products export to all over the world and 20% sell in domestic market.