Black oxide is a conversion coating about 1–2 µm thick, usually oiled. It adds mild corrosion resistance and keeps dimensions exact, which matters on 10.9 and 12.9 parts — there is no hydrogen embrittlement risk.
In stock now: 1,589 lines; covering Screws (700), Washers & Retaining Rings (381), Set Screws (331), Socket Head Screws (327), DIN916 (309); priced from $0.0013 per piece. Every line is sold by the piece — one piece is a valid order — and volume discounts apply automatically from 5%.
Related values on the same axis
Anodised
Black
Black Nickel Plated
Black Oxide (Hardened)
Black Zinc Plated
Blue
Blue-White Zinc Plated
Blue Zinc Plated
Brass Plated
Brushed
Product families covered
Screws 700
Washers & Retaining Rings 381
Set Screws 331
Socket Head Screws 327
DIN916 309
Self-Tapping Screws 275
Self-Tapping & Drilling Screws 275
Retaining Rings 229
ANSI/ASME B18.3SH( Knurled ) 217
Round Head With Washer Self-Tapping 149
Screw & Washer Assemblies 110
DIN912 Plain & Spring Washer Assemblies 110
Frequently asked
What is Black Oxide?
Black oxide is a conversion coating about 1–2 µm thick, usually oiled. It adds mild corrosion resistance and keeps dimensions exact, which matters on 10.9 and 12.9 parts — there is no hydrogen embrittlement risk.
How much do Black Oxide fasteners cost?
Prices in our catalogue for Black Oxide run from $0.0013 to $17.6686 per piece, depending on diameter, length and material. There is no minimum order, and volume discounts apply automatically from 5%.
Is there a minimum order quantity for Black Oxide?
No. Every line is sold by the piece, so you can order a single piece to check the fit and the finish before committing to a production quantity. Volume discounts start at 5% and step down as the quantity rises.
What do you stock in Black Oxide?
Black Oxide Fasteners currently covers 1,589 lines across Screws, Washers & Retaining Rings, Set Screws, Socket Head Screws, DIN916, Self-Tapping Screws. The full list of sizes, materials and finishes on this page is live — use the filters at the top to narrow it down.
How quickly do you ship Black Oxide fasteners, and can you send them to the EU or Russia?
In-stock lines leave our Foshan warehouse within 24–48 hours. We ship worldwide, including the EU and Russia. For the EU we are appointing a responsible person under Regulation (EU) 2023/988 (GPSR); for EAEU orders the conformity documents are handled with the importing party, who is the applicant of record. We can supply an EN 10204 3.1 mill test certificate, a full technical specification and a packing list with weights on request.