I used a 10mm masonry bit to drill for a 10mm plastic anchor like that pictured. The anchor spins freely in the hole, which I think is expected. I thought I read somewhere that the screw size should be 2mm less than the anchor. Thus 8mm for a 10mm ø anchor. But an 8mm screw is fat enough to rub sides of the anchor as it is inserted because I suppose the anchor is only 1mm thick at the opening. The guy at the shop confirmed that 8mm is too big. He said a 6mm screw matches and sold me those. After installing and loading, the anchor started to pull out.
Do I need a 7mm ø screw? Odd sizes get decreasingly common above 5mm. Yet 10mm sleeves are very common… so it’s not adding up.
I would like to have a reliable PDF chart of bore,anchor, and screw sizes – in metric. It seems there are plenty of such charts for Imperial/English units, like these:
- http://nfaspace.com/services/Forms_files/Anchor Classification Guide.pdf
- https://anchors.dewalt.com/anchors/_documents/uploads/DWANF_ICDWANCHSG_r01.pdf?1659150839
I’m not sure what a “#10” screw or anchor is. Does that refer to the metric size despite being in an imperial system.
Those plastic anchors do not work very well with masonry. Even when used in the correct materials, it’s unlikely they would stay very long with that much weight.
Your easiest option would be to use tapcom masonry screws. Be sure to clean out the debris from the hole beforehand and be sure to not over torque the screw otherwise it will strip the brick.
Your second option would be to use a masonry anchor. I like the lead shield anchors as they work in both hollow and solid bricks.