what screw to use with penny washer?

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I am fitting some trunking which has some adhesive on the back

However as I am a belt and braces type of guy, I would like to drill into the masonry, insert a plug, the a washer and some sort of screw to ensure the trunking stays fixed

However I am confused on the correct screw to use with the penny washer. Could someone advise?

If it helps i plan to use a M5 or M6 washer like this
https://www.toolstation.com/penny-washer/p86424

With this trunking
https://www.toolstation.com/mini-trunking-3m/p12544
 
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pretty much anything.
you "shouldn't" use countersunk but it would be fine. The most obvious thing is that the screw does"t go through the hole.
A round head would be better but I doubt any difference
maybe slot the screw hole for expansion
 
I have fitted miles of this trunking, never felt the need for penny washer, I just use number 8 woodscrews and red plugs if its on masonry
 
Since you are going to screw the trunking to the surface, I would advise NOT to use the self adhesive on the back. (This can be scraped off with a scraper.)

The reason not to use the sticky is because if you do decide to ever remove it, it CAN take the finishing plaster off the wall - which is not a pretty sight.
 
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Re. red plugs: I thought we weren't allowed to use plastic fixings anymore?????
 
If you're screwing it, save money and buy trunking without adhesive...
 
if the cable is not otherwise held in place, you'd need metal bands/fixings as well to stop them dropping in a fire.
 
I usually drill straight through the trunking into the wall & insert a red plug through the trunking, when the countersunk screw head meets the wall plug, it spreads out creating a "washer" of sorts.

:D
 
I usually drill straight through the trunking into the wall & insert a red plug through the trunking, when the countersunk screw head meets the wall plug, it spreads out creating a "washer" of sorts.

:D

Wot he said!
 

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