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Old 29th Dec 2020, 2:14 am   #1
Sparky67
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Default Anti-Tamper Bolt Head ID

Hi all,

Can anyone ID the bolt head type in the photo please, so I can look for a suitable tool to remove them. It’s just over 5mm diameter, the shape is proud and slightly tapered/rounded. I need to remove eight from a 1980s Pye / Philips PMR PSU.

Many thanks,

Martin
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Old 29th Dec 2020, 2:36 am   #2
Terry_VK5TM
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Default Re: Anti-Tamper Bolt Head ID

Flanged Button Head

There is a good guide on RS that shows the various types of security screws. https://uk.rs-online.com/web/general...y-screws-guide
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Old 29th Dec 2020, 8:20 am   #3
TonyDuell
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Default Re: Anti-Tamper Bolt Head ID

That looks like a 'System Zero' screw to me. Almost impossible to remove without the correct tool

RS do insert bits to fit them, for example :

https://uk.rs-online.com/web/p/screw...-bits/0542116/

There are only 4 sizes I think.
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Old 29th Dec 2020, 9:52 am   #4
Sparky67
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Default Re: Anti-Tamper Bolt Head ID

Thanks Gents. The Flanged Button Head is certainly very similar, from the RS page it looks like the System Zero head is the actual one in this case. Turns out there is a forum thread on that screw head type

HERE

which indicates a standard miniature socket will remove them, possibly both types. Hadn’t thought of trying that. A little job for later today.

Thanks again.

Martin
G4NCE
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Old 30th Dec 2020, 9:18 am   #5
audiomagpie
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Default Re: Anti-Tamper Bolt Head ID

If the head is proud another option is to saw a slot and then use a screwdriver to remove, if RS type they are not a hard metal.
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Old 30th Dec 2020, 1:39 pm   #6
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Default Re: Anti-Tamper Bolt Head ID

I have use a pair of side cutters or pliers to undo these.
 
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