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[China]
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Address: NO.12 HUANGHE RD ,HUANGJINAG , DONGGUAN, GD,CHINA
Contact name:David
VEDALI HARDWARE CO., LTD |
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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 .
Material
Carbon steel with grade 4.8
Optional materials for telfon coated screw bolt like stainless steel , aluminum , brass and titanium etc .
Finish
blue
Dimensions
| Thread | |
| Length | |
| Head diameter | |
| Head height | |
| Drive |
Mechanical Properties
| Rel N/mm2 | 370 |
| Rm N/mm2 | 495 |
| A ( % ) | 33.5 |
| Reduction of areaZ ( % ) | 66 |
| Density g/cm^3 | 7.85 |
| Tensile strength(σb/MPa | 450 |
Final properties data maybe different as dimensions , process and hardening for coated screw
Feature
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
Applications
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 .
About customzation
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 .
