Black Anodized M4 Hex Nut Supply

Did you try here?

Yes, tried there & KellySearch without luck. The company I mailed in the US have also replied to say that they only supply Nylock nuts black anodised.

Last night I was able to find a finish option on the Global Spec search engine for black oxide finish of metric nuts but not black anodised. An anodised finish implies to me aluminum metal. Did you search also for a black oxide finish?

We've used black oxide or black japanned in the past but they tend to rust after a while. I was looking for black anodised aluminium, the aluminium nuts are easy to find but not black anodised.

If you can find the aluminium nuts easily, why not buy a suffcient quantity and have them anodized? I'd be surprised if that was more expensive than finding specialised fasteners.

That's an option, I was just hoping to find them already done.

If anodization is the same as black oxide coating, that is a common coating here. it is available from any fastener supplier such as Fastenal, Mc Master-Carr, etc. Available in SAe and metric. This coating helps prevent rust and is used for nuts, studs and blocks for milling machine setups.

Black Oxide chemical process for Steel, Anodize chemical process used for Aluminum.

When I worked in R&D, the Anodize penetration into the aluminum was equal to the buildup on the outside surface. I believe that applies to the "Hard Anodize" process.

i think we're mixing terms? Aluminum is anodized. Steel is black oxide coated. Some steels may be "anodized", I guess but not sure what the correct terms are.

Anodising only applies to aluminium. I have seen a process to coat steel in aluminium then anodise it but that's a bit exotic. I think the process is ivadizing.

This is what McMaster-Carr has:
Metric Hex Nuts-DIN 934

All of these metric hex nuts have a Class 6H thread fit and meet DIN 934, except those made from Bumax 88 stainless steel and nylon 6/6.

For technical drawings and 3-D models, click on a part number.

Is Australia to far? Price: AUD $0.25

http://www.thekoolroom.com/product/m4-hex-nut-black/

M4 Black Nut use in conjunction with M4 screws for a secure fit for any mod or installation project.

• Head Style: Socket Head Cap
• Material Type: GR 304 S/S Black
• Finish: Anodized Black

System of Measurement: Metric

• Metric Thread Size: M4
• Metric Thread - Height: 2mm
• Head Size: 7mm socket or wrench needed

That one confuses me. The spec says it is made from 304 stainless & anodised black. That just doesn't work.

Bring them into my shop in Ottawa.

I will blacken them for you. If they are steel, they will get black oxided. If they are aluminum, they will get anodized.

OTOH, there hundred of anodyzing shops closer to you than to me!

try Misumi CBALNB4

http://www.misumiusa.com/CategoryImages/Metric_2009_pdf/p1349.pdf

baaa, it looks like a discontinued part

I think I have to bite the bullet on this one & get some parts made. One advantage is that I can make a long blind nut that will cover the stud as well so it's not all bad.

Thanks for all the comments.