Which wall plug for imperial 1/4 inch screw?

[kostic2000]

Hi,

I need to hang a guitar holder to the brick wall. The thing is, although sold in Europe, the hanger is US made and comes with an imperial size screw, 1/4 inch (6.35mm). Measured length is around 42mm or so. The
Which wall plugs should I use?
Been looking at Fischer S nylon plugs, but should I use 8x40 or 10x50? 10mm is spec'ed for 6-8mm screws, so within range, but it's a but on the lower end of it and the screw won't reach the end of the plug. Should I go for 8x40, although it is spec'ed for up to 6mm screw?

P.S. I should mention that the screw is a special double ended type (more like a dowel), threaded on one half and wood screw on the other, so changing to a different one is not an option.

Thanks,
Kostic

 

[big-all]

its the shank size you measure and called wire gauge 6.35 is that the shank or the head??

 

[kostic2000]

Like I mentioned there is no head, as it's a dowel, so no head to measure.

 

[big-all]

ahh ok a threaded dowel
well 6mm is a brown plug 7mm masonary drill bit hammer action

 

[kostic2000]

Thanks.

So you suggest using the plug for up to 6mm screw, which is a bit smaller than the screw in question. This is what I've been leaning towards too.

 

[big-all]

the plug is 7mm so a 1/4" dowel will be a tight "interference" fit at 6.35mm
remember the plug fill perhaps 2mm all round so the thread will grip well

 

[kostic2000]

I presume you are talking about generic brown plugs at 7mm. Is there any advantage to upgrade to nylon ones, like these https://www.toolstation.com/shop/Screws+&+Fixings/d90/Wall+Plugs/sd2060/Fischer+Nylon+S+Plug/p18262?

 

[big-all]

in my humble opinion no but wait for others to comment as i am not without fault
in general the wings on the side off the plug can grip well but a well sized hole will not be a problem
you can also pad out the hole to make the plugs tight

 

[Deleted member 174758]

The brown plugs are nylon as well. No point in going to an 8mm especially if the wall is soft blockwork or poor quality brick where your hole would be slightly enlarged in any case. Rawl or Rawlplug is a good brand

 

[kostic2000]

Thanks everybody for the answers. I'm looking for the highest reliability as I'd rather not see my prised guitar fly down from the wall!

 

[opps]

the (brown) plug is 7mm

Until someone decides to be awkward and makes their brown plugs 8mm

https://www.screwfix.com/p/fischer-plastic-wall-plugs-brown-8mm-300-pack/42487

 

[opps]

If the plaster on your walls is thick and really crumbly. The safest option might be to buy threaded rod of the correct diameter and then use anchorfix to glue it in to the brick rather than plaster.

You will however be looking at £10-12 (excluding the cost of a hack saw and mastic/caulking gun).

***edit***

You drill through the plaster, in to the brick. Use your vacuum cleaner to remove the debris. Check to see how long you want the threaded rod to be, cut it length. Then squirt the resin in to the hole. Immediately insert the rod. Prop it for a few minutes until the resin cures.

After that, you are good to go.

Personally, I would only go down that path if you have a house built at the turn of the last century and has the original 50mm(?) thick horse hair plaster.

 

[kostic2000]

The plaster maybe old (haven't checked in that particular room yet), but pretty sure it's not 50mm thick. The house is late 20s.

To oops: Yes, this is where I got 8mm thing from as well.

 

[Deleted member 174758]

Until someone decides to be awkward and makes their brown plugs 8mm

https://www.screwfix.com/p/fischer-plastic-wall-plugs-brown-8mm-300-pack/42487

Trust Screwed-Up to be completely at odds with almost the entire construction industry. Well done!

 

[opps]

To be fair, it is Fischer that broke ranks rather than screwfix.