China wholesale Hex Bolt A490 - Joint Bolt – Ji Luo Fastener

Joint bolts, also known as hole bolts in China, comply with GB/T798-88 standard; fish-eye bolts abroad, comply with DIN444 standard.
Refined hole bolts, glossy spherical surface, high accuracy of thread , specifications from M6 to M64.
The surface treatment includes: hot-dip galvanizing, infiltration plating, white plating, color plating, etc. The original color of the high strength bolt is boiling black.
Material: Q235, 45, 40Cr, 35CrMoA, 304 stainless steel and 316 stainless steel, etc.
Application items: filter self-rescue device, gas detection instrument, dust mask, mine raincoat, mine explosive device.
Application details:widely used in low temperature and high pressure valves, pressure pipelines, fluid engineering, oil drilling and production equipment, oil field equipment and other fields. Because of the convenient ,it also oftenly used in the occasions or tools disassembly and connection , such as valve industry, folding bicycles, children’s cars. For valve bolts, the sealing problem can not be ignored, because the valve running, leakage, dropping, the quality of valve bolts must be guaranteed in order to ensure the safety of use.