din933 grade 8.8 black bolt--DUE

 Grade 8.8 black din933 bolt  :

• Hex bolt is  always made by  carbon steel, alloy steel and stainless steel.
• Inch series as per ANSI B18.2.1 dimensions always supplied in Grade 5 and Grade 8 according to SAE standard in carbon steel and alloy steel. 
• Metric series carbon steel hexagon bolts generally supplied in class 4.8, 8.8, class 10.9 and class 12.9 as per DIN931/933, DIN6914,A325/A325M,A307,A490, BS3692,JIS1181,etc.and ISO standard Nonstandard bolt
• Surface treatment could be in black oxide, galvanizing, dacromate. Stainless steel hex flanged bolts also available in SS304 and SS316, Class A2-70 and A4-80.

   SHANGHAI GENRUI is a manufacturer of all standard DIN, BS,JIS and ISO fasteners and other industrial parts with well-equipped testing facilities and strong technical force.  

      With a wide range, good quality, reasonable prices and stylish designs, our products are extensively used in Mold, Electricity, Construction, Solar energy, Automotive, Machinery & Equipment and other industries.  

     Our company has purchased steel from several large steel groups , such as Hangzhou Steel Mill, Shanghai Bashan Steel Mill, Beijing Shrugging Steel Mill whose steel have good mechanical properties and stability of chemical component. it keep the bolt to be of high strength

    First, we have our own High-precision Digital Machining center for mould making in special Mould Workshop, excellent mould make product beautiful appearance and its size accurately.

    The second, we adopt blasting procession, removing Oxidation surface, make the surface to be bright and clean and uniform and beautiful.

   The third, in heat treatment: We use the Controlled-atmosphere Automatic heat treatment Furnace, we also have four mesh belt convey furnaces, Can deal with the products in different sizes keeping the non-oxidation surface.

   The quality control is strictly performed from buying raw materials in warehouse to different machining procession and to final packing. We have Magnetic Powder Detector, Material Testing Machine, Metallographic Microscope, such testing instruments, guarantee product high quality and beautiful appearance.Single bolts, every month can produce 5000 Tons.

   Our products are widely recognized and trusted by users and can meet continuously changing economic and social needs.  

 We welcome new and old customers from all walks of life to contact us for future business relationships and mutual success!