Active joint bolt, also known as fisheye bolt. Refined hole bolt, with a smooth spherical surface and high thread accuracy, with thread specifications ranging from M6 to M64. The surface treatment of active joint bolts includes anti-corrosion measures such as hot-dip galvanizing, white plating, and color plating. The factory color of high-strength bolts is boiled black orchid, and the materials include: Q235、45#、40Cr、35CrMoA、 Stainless steel 304 and stainless steel 316, etc. Due to the convenient and fast use of articulated bolts, they play a role in connecting and fastening with matching nuts, and have a wide range of applications.