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 Post subject: Black Screws
PostPosted: Thu Feb 22, 2018 5:00 pm 
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Hi all,

I'm looking for some black machine screws.

I've been using spray paint up until now, but paints just seem to rub off and look generally rubbish. Does anyone have any experience with black coatings that are a little more durable?

Thanks, Jeff


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 Post subject: Re: Black Screws
PostPosted: Thu Feb 22, 2018 5:32 pm 
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For inside or outside use?
Inside use I've blackened them by heating up to "black heat" and then quenching in oil. Do it a couple of times. Surprisingly durable. That's assuming that they're mild steel screws of course, and I wouldn't do it with anything structural or critical.


Last edited by Dave54 on Thu Feb 22, 2018 5:40 pm, edited 1 time in total.

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 Post subject: Re: Black Screws
PostPosted: Thu Feb 22, 2018 5:36 pm 
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:welcomeuhm:



RS Components do "black passivated" (coated) and Rapidonline do "black oxide steel" which I imagine means self-coloured.

But no point in searching online without knowing thread required, length, head type etc.

Any coating you apply yourself is likely to be so soft as easily damaged by tools.

I myself use "black zinc" pozidrive self-tappers from Spalding Fasteners, I suppose these must be 'passivated' as above, but they don't seem to do machine screws.


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 Post subject: Re: Black Screws
PostPosted: Thu Feb 22, 2018 5:40 pm 
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Halfords- I've got couple boxes of various sized ones, had a long time, assume they still do them. Otherwise, Ebay is my go to for anything like this in small quantities.


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 Post subject: Re: Black Screws
PostPosted: Thu Feb 22, 2018 5:58 pm 
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I think what you after is black jap or japanned machine screws, black (blued) machine screws are ultra common too

If its a bolt that is seen I tend to use stainless unless you need the tensile strength, brass is another option


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 Post subject: Re: Black Screws
PostPosted: Thu Feb 22, 2018 11:54 pm 
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The problem with so-called "chemically blacked" screws is that the coating is not rustproof and it has poor wear characteristics making them unsuitable for exterior use because they will start rusting pretty quickly. Black plated or japanned screws on the other hand will resist the ravages of the awful English (or Scottish, Welsh, Irish) weather

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 Post subject: Re: Black Screws
PostPosted: Fri Feb 23, 2018 7:15 am 
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Yeah the blackened screws you normally get with items are useless outside.

My LED lights I recently fitted to the car came with black screws for fitting, they didn't even last a week before they were bright orange! Now replaced with some zinc passivated which are not as pretty but will last a lot longer. I wanted to use brass but didn't have any the right size.


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 Post subject: Re: Black Screws
PostPosted: Fri Feb 23, 2018 10:25 am 
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Sorry, probably should have been more specific on the application.

They are M6 x 20 pan heads, and going outside - I think I was using painted mild steel previously, so they obviously didn't last long.

Would a black zinc coating from RS rust eventually? I was thinking a blackened stainless steel may be best.


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 Post subject: Re: Black Screws
PostPosted: Fri Feb 23, 2018 10:51 am 
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Stainless steel painted with black car paint would probably hold up well. When I painted some screws and numbers for a house sign I used black car paint and then a couple coats of gloss lacquer (UV resistant). Both numbers and screws are looking great after several years in the elements.


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 Post subject: Re: Black Screws
PostPosted: Fri Feb 23, 2018 1:33 pm 
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depending on the use nylon may also be a option, other wise you can get 'colourfast' stainless


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 Post subject: Re: Black Screws
PostPosted: Fri Feb 23, 2018 1:46 pm 
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You could paint them or you could just buy them here...

https://www.accu.co.uk/en/pozi-pan-head ... gKYIPD_BwE

Never used this company so can't vouch for them.

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