Steel 1018
Common material for this finish.
View materialSurface Finishing
Black Oxide Conversion Coating
Black oxide converts the surface of ferrous metals into magnetite, giving a uniform matte or semi-gloss black. It is usually sealed with oil or wax, which provides mild corrosion resistance.
Specification
Typical options
| Attribute | Typical behavior | Notes |
|---|---|---|
| Thickness | ~1 µm or less | Little to no dimensional change |
| Appearance | Matte to semi-gloss black | Depends on surface prep |
| Corrosion | Mild, mainly from the oil or wax sealant | Not for outdoor exposure alone |
| Common spec | MIL-DTL-13924 | Class depends on substrate |
Typical industry ranges for reference. Final thickness, color, and specification are confirmed on your quote and drawing.
Design Tips
What to specify on your drawing
Threads and fits
Usually no masking needed because thickness is negligible.
Reduced glare
Useful for optical and tooling components.
Substrates
Carbon and alloy steels; separate processes exist for stainless steel.
Handling
Sealant can transfer; note if parts must be oil-free.
Compatible Materials
Materials often paired with this finish
Steel 4140
Common material for this finish.
View materialStainless Steel 17-4 PH
Common material for this finish.
View materialSurface Finishing Service
See all finishing and post-processing options.
View serviceAdd a Finish
Include finish requirements with your RFQ.
Note the finish, specification, color, thickness, and masked areas on your drawing so the quote reflects them.