Strange that it recommends a 5.5mm drill bit for a 6 - 8mm plugs. I don’t even remember seeing masonry bits of that size and for all the plugs I have I’ve always used the same size drill bit.
I am a complete amateur, but the box fits my experience.
If you use same size drill as the plug, the whole will be too big, and the plug is not fitting tight and firm enough, so the screw will just rotate the plug in the whole.
Especially in old brittle cement and “mortar” you need to be careful not to use too big a drill.
“Mortar” as the cement like material used when building a brick wall. I hope I’m using the correct word.
This might be true for some cheap brands, but it’s certainly not true for any of the tens of thousands of plugs I’ve installed over my career. The plug diameter indicates the hole size you need to drill - 6mm hole for a 6mm plug, 8mm hole for an 8mm plug, and so on. The instructions here simply cannot be correct, as 6mm and 8mm plugs require different-sized drill bits, yet the packaging only mentions a 5.5mm bit. The only exception I can think of is concrete screws that don’t need a plug: 6mm is correct for concrete, but for more porous materials like cinder blocks, you use a 5.5mm bit.
Judging by the fact that people in this thread are finding translation errors in the text there I’m assuming that’s what has happened with the measurements too.
Here’s the instructions for 6x30mm Fischer DuoPower Plugs for example.
I only see length on that box???
Also the image shows th plug sticking out, and as (2)40 mm, with something else that is unclear to me as (2)35mm.
Personally by the quality shown, the illustrations are useless to me.
The plug is 6mm meant for 4-5 mm screws, there is no indication of drill sizes that I can se.
There is also a measure on the right of (2) 12.5 mm which is completely unclear what is for?
Pretty cleary states the drill dimension right here
There is also a measure on the right of (2) 12.5 mm which is completely unclear what is for?
It means that the board you’re attaching to needs to be atleast 12.5mm thick for the plug to work properly.
and as (2)40 mm, with something else that is unclear to me as (2)35mm.
The hole needs to be atleast 40mm deep and the screw must be long enough that when accounted for the thickness of the material you’re attaching it needs to be atleast 35mm into the plug.
They’re mixing up their metric and imperial sizes. These are from Forgefix, which are a British company. Many British people aged about 55 and over tend to still use imperial sizes for some things.
So it’s not 6-8mm, but "the size of wall plug for 6-8 gauge screws, which are 3.5mm - 4mm screws in metric.
Strangely, if you buy a multipack of masonry bits, they give you 3, 4, 6, 8, 10mm bits. Some brands of wall plugs tend to use 5.5mm, 6.5mm, 7mm. It is a conspiracy!
Your options are:
Use a smaller drill bit and wiggle it, just a little bit
Use a larger drill bit and pack it out with a shim/matchstick/chopped off half-a-wallplug
Individually buy the masonry bits which correspond to the plugs
Buy a different brand of wall plug, which uses 6mm or 8mm bits
Strange that it recommends a 5.5mm drill bit for a 6 - 8mm plugs. I don’t even remember seeing masonry bits of that size and for all the plugs I have I’ve always used the same size drill bit.
I am a complete amateur, but the box fits my experience.
If you use same size drill as the plug, the whole will be too big, and the plug is not fitting tight and firm enough, so the screw will just rotate the plug in the whole.
Especially in old brittle cement and “mortar” you need to be careful not to use too big a drill.
“Mortar” as the cement like material used when building a brick wall. I hope I’m using the correct word.
This might be true for some cheap brands, but it’s certainly not true for any of the tens of thousands of plugs I’ve installed over my career. The plug diameter indicates the hole size you need to drill - 6mm hole for a 6mm plug, 8mm hole for an 8mm plug, and so on. The instructions here simply cannot be correct, as 6mm and 8mm plugs require different-sized drill bits, yet the packaging only mentions a 5.5mm bit. The only exception I can think of is concrete screws that don’t need a plug: 6mm is correct for concrete, but for more porous materials like cinder blocks, you use a 5.5mm bit.
Judging by the fact that people in this thread are finding translation errors in the text there I’m assuming that’s what has happened with the measurements too.
Here’s the instructions for 6x30mm Fischer DuoPower Plugs for example.
I only see length on that box???
Also the image shows th plug sticking out, and as (2)40 mm, with something else that is unclear to me as (2)35mm.
Personally by the quality shown, the illustrations are useless to me.
The plug is 6mm meant for 4-5 mm screws, there is no indication of drill sizes that I can se.
There is also a measure on the right of (2) 12.5 mm which is completely unclear what is for?
I don’t see how the image supports your point?
Rawl brand have these notes on the plastic, which I think is neat.
Brown plug, 7mm hole, 5-6mm screw.
Even a little gauge to go with it.
Pretty cleary states the drill dimension right here
It means that the board you’re attaching to needs to be atleast 12.5mm thick for the plug to work properly.
The hole needs to be atleast 40mm deep and the screw must be long enough that when accounted for the thickness of the material you’re attaching it needs to be atleast 35mm into the plug.
They’re mixing up their metric and imperial sizes. These are from Forgefix, which are a British company. Many British people aged about 55 and over tend to still use imperial sizes for some things.
So it’s not 6-8mm, but "the size of wall plug for 6-8 gauge screws, which are 3.5mm - 4mm screws in metric.
Strangely, if you buy a multipack of masonry bits, they give you 3, 4, 6, 8, 10mm bits. Some brands of wall plugs tend to use 5.5mm, 6.5mm, 7mm. It is a conspiracy!
Your options are: