Customized Non-Standard 4.8 8.8 10.9 12.9 Carbon Steel Hex Flang Bolt

Customized Non-Standard 4.8 8.8 10.9 12.9 Carbon Steel Hex Flang Bolt

A circular groove is opened in the middle of the two flanges, the metal ring is placed in, the two flanges are hit hard, and the flange is hard connected.