》Return to top page for Basic Information on screws

◯：very effective　　△：effective

【Description of characteristics】

Zinc plating		Decorativeness ◯　 Corrosion resistance △　 Abrasion resistance ┄　 Conductivity ┄				●Glossy chromate treatment on electro-galvanizing base. ●Contains environmental additives. ●Film thickness 5 μm.
Zinc plating Cr6+		Decorativeness ┄　 Corrosion resistance ◯　 Abrasion resistance ┄　 Conductivity ┄				●Electro-galvanizing base with colored chromate treatment ●Contains environmental additives. ●Film thickness 5 ～8 μm
Black zinc plating		Decorativeness ◯ Corrosion resistance ◯ Abrasion resistance ┄ Conductivity ┄				●Electro-galvanized base, chromate treated with a solution containing silver nitrate ●Relatively inexpensive black plating ●Film thickness15μｍ
Zinc plating Cr3+		Decorativeness ◯ Corrosion resistance △ Abrasion resistance ┄ Conductivity ┄				● Replace with trivalent chromium, RoHS compliant
Black zinc plating Cr3+		Decorativeness △ Corrosion resistance ◯ Abrasion resistance ┄ Conductivity ┄				● Replaced with trivalent chromium to comply with RoHS
Bronze plating		Decorativeness ◯ Corrosion resistance ┄ Abrasion resistance ┄ Conductivity △				●It is called GB plating. ●It is dipped in a special chemical and polished in order to apply copper plating to the base and dye it thin black.
Nickel plating		Decorativeness ◯ Corrosion resistance △ Abrasion resistance △ Conductivity △				●It is often used for decoration because of its beautiful lustrous plating. ●A copper plating or nickel plating is applied to the substrate to improve corrosion resistance and adhesion to iron ●thickness. 10μｍ
Black nickel plating		Decorativeness◯ Corrosion resistance△ Abrasion resistance┄ Conductivity┄				●It is often used for decoration because of its beautiful lustrous plating. ●A copper plating or nickel plating is applied to the substrate to improve corrosion resistance and adhesion to iron ●thickness. 10μｍ
Electroless nickel plating		Decorativeness △ Corrosion resistance ◯ Abrasion resistance ◯ Conductivity △				●It can also treat materials that do not conduct current, such as resin. ●The alloy of nickel and phosphorus is reduced in the solution and deposited on the surface, so it can be treated evenly. ●Thickness 3～20μｍ
Chrome plating		Decorativeness ◯ Corrosion resistance ◯ Abrasion resistance ◯ Conductivity ┄				●Chrome layer over nickel plating ●Highly decorative, beautifully shining like silver, plating with the most metallic-feeling
Buff chrome plating		Decorativeness ◯ Corrosion resistance ◯ Abrasion resistance ◯ Conductivity ┄				●Buffing is applied to the base material before chrome plating to make the surface smooth. ●luster ●Better aesthetics than normal chrome plating ●Thickness 15〜30μｍ
Tin plating		Decorativeness ◯ Corrosion resistance ◯ Abrasion resistance ◯ Conductivity ┄				●The silvery white luster is due to its high atmospheric stability. ●Less toxic to humans than other metals
Dip plating		Decorativeness ┄ Corrosion resistance ◯ Abrasion resistance ┄ Conductivity ┄				●Since the coating is very thick, when applying it to internal threads, the threads will be crushed unless over-tapped.
Ruspert		Decorativeness ┄ Corrosion resistance ◯ Abrasion resistance ┄ Conductivity ┄				●Good resistance to acid and alkali, making it suitable for outdoor use ●Not compliant with RoHS (because it contains hexavalent chromium)
Disgo		Decorativeness ┄ Corrosion resistance ◯ Abrasion resistance ┄ Conductivity ┄				●Heat resistance ●Weather resistance ●Excellent chemical resistance ●Chrome-free treatment developed to prevent hydrogen embrittlement ●Because of chrome-free treatment, it is gentle on the human body.
Geomet		Decorativeness ┄ Corrosion resistance ◯ Abrasion resistance ┄ Conductivity ┄				●Contains no hexavalent chromium, so it complies with RoHS. ●Can be applied to various metals such as iron, aluminum, and stainless steel. ●Thickness 8 μm