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screws and fasteners,
Hex head screw bolts
M4 Carbon Steel Blue Coated Screw Bolt Hex Head Fastener for Car
Hex head screw bolts are made from carbon steel with coating instead of normal zinc finishs . coating is specially used for special working conditions like extreme high or low temperature , high requested lubricantion and resistant corrosion etc . coating of screw or bolt is similar with powder coated bolt or screw but different on performance .
Mostly , coated screw or bolt is blue color and green yellow , red , black and white can be made for custom requirements . coated screw is made of carbon steel for the most applications , but stainless steel and aluminum is used for special requests .
Carbon steel with grade 4.8
Optional materials for telfon coated screw bolt like stainless steel , aluminum , brass and titanium etc .
|A ( % )||33.5|
|Reduction of areaZ ( % )||66|
Final properties data maybe different as dimensions , process and hardening for coated screw
Leading difference for coated screw compared to normal screws is its coating ,this kind coating with perfect features
1 . Resistant high or low temeperature
coated screw bolt can be worked from 100 degree zero to 260 degree .
2 . Not easy to be loosen
coating is good self lubricant and just 0.4 friction factor .
3 . Resistant corrosion
coating is not mostly dissolved into any chemical solvents .
4 . Not easy to be broken
coated screws are made of carbon steel with good enlongation and ductility .
Tips for use
1 . Do not put coated screw into temeprature over 260 degree .
2 . Not suitable for heavy duty .
3 . Do not scratch coating for long service
coated screw bolt is used for car , and used for other fields as well like chemical industry , machinery , electronical equipments , building and ocean equipmnets etc .
coated screw bolt can be customzied according to your special applications , eg , material , thickness of coating , dimensions , hardness , basic profile of screw and packing etc .
Besides , coated screw , we provide more fasteners with metal and plastic materials for you . eg , different stainless steel screws , various fastener screws , metal stamping parts , custom plastic parts , spacer washers , fastener pins and standard or non-standard bolts nuts .
Contact Person: MR.LIN