| Name of exterior finish |
Standard thickness |
Treatment materials |
Features and general use |
| Nickel plating |
3μｍ |
Iron and steel, brass and
stainless steel |
They are inexpensive, but easily get rusted than the chromium plating. Light silver colored.
Application: Machine screws, hexagon nuts, etc. |
| Stain-like nickel plating |
3～5μｍ |
Iron and steel, brass and
stainless steel |
They are plated with nickel plating after providing satin-like finish to them. Light silver colored.
Application: Machine components, etc. |
| Chrome No.1 |
8μｍ |
Iron and steel, brass and
stainless steel |
They are plated with a thick chrome plating and a polished finish is applied to them after being buffed. Silver-colored mirror finished surface.
Application: Ornaments, etc. |
| Chrome No.3 |
7μｍ |
Iron and steel, brass and
stainless steel |
This is a bright plating and excellent in appearance. Spectral hues can be seen on the surface. Silver colored.
Application: Ornaments, etc. |
| Satin-like chromium plating finish |
10μｍ |
Iron and steel, brass and
stainless steel |
They are plated with chromium plating after providing satin-like finish to them. Whitish silver colored.
Application: General components. |
Chromate treatment
[noncompliant with RoHS] |
5μｍ |
Iron and steel, brass and
stainless steel |
Noncompliant with RoHS. It contains more than 1,000 ppm of hexavalent chrome. Gold-colored.
Application: Sheet metal, nuts, bolts, etc. for electric appliances. |
| Trivalent chromate |
5μｍ |
Iron and steel, brass and
stainless steel |
Compliant with RoHS. Because its main component is white trivalent chromium salt, it is free from poison and wastewater treatment can be done with ease. Gold-colored.
Application: Sheet metal, nuts, bolts, etc. for electric appliances. |
Black chromate
[noncompliant with RoHS] |
5～8μｍ |
Iron and steel, brass and
stainless steel |
Noncompliant with RoHS. It contains more than 1,000 ppm of hexavalent chrome.
Application: Sheet metal, nuts, bolts, etc. for electric appliances. |
| Trivalent black chromate |
5～8μｍ |
Iron and steel, brass and
stainless steel |
Compliant with RoHS. Because it primarily consists of black plating material and trivalent chromium salt, it is free from poison and wastewater treatment can be done with ease. It generally called the "trivalent black".
Application: Sheet metal, nuts, bolts, etc. for electric appliances. |
| Black nickel plating |
3μｍ |
Iron and steel, brass and
stainless steel |
Because its quality is somewhat irregular, it is used for internal components. Glossy black.
Application: General components. |
| Black chromium plating |
1μｍ |
Iron and steel, brass and
stainless steel |
It is used for components to be polished. Because its plating thickness is thin, it is used for high-precision components. Plating nonuniformity is prone to occur. Light black colored. |
| Hard black chromium plating |
5～9μｍ |
Iron and steel, brass and
stainless steel |
While it is highly adherent and excellent in wear resistance, it is expensive. Matte black finish. It is costly for larger sized components.
Application: High-precision components to be polished, stages, etc. |
Magnetite coating
(black oxide finish) |
3μｍ |
Iron and steel |
Magnetite coating is generated on the surface.
It is used for those components that are to be polished after providing exterior finish, such as a shank. It is easily rusted.
Application: Shank, etc. |
| Gold plating |
0.1～10μｍ |
Iron and steel, brass and
stainless steel |
Gold-colored plating.
Application: Special components or the like that are used in a vacuum. |
| Silver plating |
1～20μｍ |
Iron and steel, brass and
stainless steel |
Silver-colored plating. It provides a good electrical continuity.
Application: Special electrical components, etc. |
| Copper plating |
5～μｍ |
Iron and steel, brass and
stainless steel |
Copper-colored plating.
Application: Foundation layer, etc. for nickel plating and chromium plating |
Electroless nickel plating
[Some are not compliant with RoHS.] |
5～8μｍ |
Iron and steel, brass and
stainless steel
Aluminum alloy |
It provides a thin and uniform thickness of silver-colored plating which is used for general components to be polished. Because it is electroless plating, it can reach the inner surface of a deep hole.
Noncompliant with RoHS. Because of some nickel plating solutions that contain "1,000 ppm or more" of lead, which may remain on components, a proper plating solution needs to be specified. |
Rustproof black coating
(RAYDENT Processing) |
2～10μｍ |
Iron and steel, brass and
stainless steel |
Black coating of chrome oxide. Your desired coating can be specified. There are instances in which this coating may be regarded as paint application.
Application: Stage, etc. |
| White alumite finish |
8μｍ |
Aluminum alloy |
Its hue looks like a whitish aluminum of which spectral hues can be seen on the surface.
Application: Machine components. |
| Satin-like white alumite finish |
8μｍ |
Aluminum alloy |
Satin-like finish is provided through chemical polishing after white alumite treatment is given. It conveys a sense of high quality. It is costly for larger sized components.
Application: Stage, etc. |
| Matte white alumite finish |
8μｍ |
Aluminum alloy |
It is a while finish coating with white alumite delustered.
Application: Machine components. |
| Black alumite finish |
10μｍ |
Aluminum alloy |
It is glossy black in appearance of which spectral hues can be seen on the surface.
Application: General components. |
| Satin-like black alumite finish |
10μｍ |
Aluminum alloy |
Chemical polishing is provided after black alumite treatment is given. It conveys a sense of high quality. It is costly for larger sized components. Black semi-gloss finish.
Application: Stage, etc. |
| Matte black alumite finish |
10μｍ |
Aluminum alloy |
It is a black finish coating with black alumite delustered.
Application: Optical components. |