Loose joint bolt Refined hole bolt, spherical smooth, high precision thread, thread specification M6 to M64. Eyelet bolt surface treatment: galvanizing, plating, plating white, color plating such as anticorrosive measures 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,