Swivel bolts, also known as eye bolts in China, follow the GB/T798-88 standard; abroad, they are also known as fish eye bolts and follow the DIN444 standard. Refined eyelet bolts have a smooth spherical surface and high thread precision. The thread specifications are M6 to M64. The surface treatment of articulated bolts includes: hot-dip galvanizing, infiltration plating, white plating, color plating and other anti-corrosion measures. The factory color of high-strength bolts is boiled black blue, and the materials are: Q235, 45#, 40Cr, 35CrMoA, stainless steel 304 And stainless steel 316 and so on. Application items: filter self-rescuer, gas detection instrument, dust mask, raincoat, mine blaster, application details: swivel bolts are widely used in: low temperature and high pressure valves, pressure pipes, fluid engineering, oil drilling equipment, Oilfield equipment and other fields are often used in disassembly and connection occasions or tools such as the valve industry, folding bicycles, and baby carriages. Because the joint bolts are convenient and fast to use, they can be used with matching nuts to tighten the connection. The scope of application Wide and wide. For valve joint bolts, the sealing problem cannot be ignored, because the running, leaking, dripping and other phenomena of the valve come from here. The quality of the valve joint bolts must be guaranteed to ensure the safety of use.

Second, the standard of live bolt

Marking example: Marking of loose joint bolts with thread specification d=M10, nominal length l=100mm, performance class 4.6, without surface treatment: bolt GB 798 M10×100