Adjustable bolt fish-eye bolts standard metal parts for the valve industry.Adjustable bolt, also known as hole bolt in China, conforms to GB/ t798-88 standard.Also known as fish-eye bolts in foreign countries, they comply with DIN444 standard.Refined hole bolt, spherical smooth, high thread accuracy, thread specification M6 to M64.The surface treatment of the bolt has: hot dip galvanized, electroless, white plating, color plating and other anticorrosive measures, high strength bolt factory color is boiled black hair blue, material: Q235, 45#, 40Cr, 35CrMoA, 304 stainless steel and stainless steel 316, and so on.Application projects: filter type self-rescuer, gas detection instruments, dust mask, ore mining raincoat, blasting device, application details: eyelet bolt is widely used in: low temperature high pressure valves, pressure pipe, fluid engineering, oil drilling equipment, oil field equipment, and other fields, often on the open connection occasions or tools such as the valve industry, folding bicycle, baby carrier, due to the eyelet bolt is convenient to use, fast, and plays a role of connecting fastening nut use of form a complete set, the application range is very wide.For valve live bolt, sealing problem can not be ignored, because the valve running, leakage, dripping and other phenomena come from here, must be on the valve live bolt quality assurance, in order to ensure the safety of use.