Which one?
A brick plug or a concrete plug in concrete?
Updated
fischer rates the same DuoPower and SX Plus plugs in brick and in concrete, each with its own figure. In concrete, read the concrete row; the plug can be the same.
In brick
- Where it goes
- In brick. fischer's tables rate the DuoPower and SX Plus in Solid brick ≥ Mz 12, and in vertically perforated brick as well.
- What it needs
- A masonry bit. B&Q says
If you're drilling into a plasterboard wall, a multi-surface drill bit is recommended. For brick walls, always use a masonry drill bit.
- How it comes down
- Unscrewed. B&Q says:
It’s generally not recommended to reuse wall plugs. Once they’ve been used, they may not hold as securely when removed and reinserted.
- Which maker's figure applies
- fischer's brick rows for that plug. We cannot tell solid brick from perforated brick, so we compare with the lower of the two. Fixing into brick has the table.
Sources: fischer, Loads, DuoPower, recommended loads for a single anchor. Checked ; B&Q, How to fit wall plugs. Checked to .
In concrete
- Where it goes
- In concrete. fischer's tables rate Concrete ≥ C20/25, and we cannot tell your concrete's class from the wall.
- What it needs
- A masonry bit of the plug's own size. Bosch says:
A masonry or concrete drill bit is the preferred option for drilling very hard materials like concrete, natural stone or granite.
If you're using wall anchors as well as screws, the drill bit and anchors should have the same diameter.
- How it comes down
- Unscrewed. B&Q's advice on reusing a plug is the same as in brick:
It’s generally not recommended to reuse wall plugs. Once they’ve been used, they may not hold as securely when removed and reinserted.
- Which maker's figure applies
- fischer's concrete row for that plug, never its brick row. Fixing into concrete and block has the table.
Sources: fischer, Loads, DuoPower, recommended loads for a single anchor. Checked ; Bosch DIY, Drill bits and wall anchors guide. Checked ; B&Q, How to fit wall plugs. Checked .
And in block?
Dense concrete block has no fischer load figure, so we give none, and we do not apply its concrete row to blocks. Aircrete is rated by class, and we use fischer's lowest aircrete row, because the class cannot be told from the wall.