Black Oxide Stainless Steel Flat Washers
What are black oxide stainless flat washers? Black oxide stainless steel flat washers are general-purpose round washers in stainless steel with a black oxide conversion coating that gives a deep matte black finish. They combine the corrosion resistance of stainless with a low-glare black look for finished and visible hardware.
What is black oxide on a stainless washer?
Black oxide is a thin conversion coating that turns the stainless surface a deep, low-gloss black without meaningfully changing its dimensions, so the washer keeps its stainless corrosion resistance while gaining a matte black appearance. This suits blacked-out builds, camera and optics hardware, and any assembly where a bright stainless washer would stand out. Because the black is a surface layer on corrosion-resistant stainless, it holds up far better than black oxide over plain steel, which relies on oil to resist rust.
Why choose black oxide stainless flat washers
- Matte black finish: low-glare look for visible and blacked-out hardware.
- Stainless corrosion resistance: the base metal resists rust.
- Dimensionally stable: the thin coating keeps the washer on-size.
- General purpose: everyday sizing for most fastening.
Common applications for black oxide stainless flat washers
- Blacked-out and custom hardware builds
- Camera, optics, and photography rigs
- Electronics and visible assemblies
- Finished work needing a low-glare washer
For a bright finish, see 304 stainless flat washers, and browse every material on the main flat washers category.
Black Oxide Stainless Flat Washers FAQ
Does black oxide affect corrosion resistance?
The corrosion resistance comes from the stainless base metal, which black oxide does not reduce. Over stainless, the finish holds up far better than black oxide over plain steel.
Will the black finish rub off?
Black oxide is a thin conversion layer, so heavy abrasion can wear it over time, but the stainless underneath still resists rust.
Is this the same as black chrome?
No. Black oxide is a thin matte conversion coating, while black chrome is a glossier electroplated finish. Both give a black look with different sheen and thickness.