I've never drilled before, but now it's time. I'm going to drill into concrete and I have 8mm plugs and 6/70 screws. But now that I've borrowed a hammer drill, I see that the 8mm bit is shorter than the screw. It's sufficient for the plug, but the screw will end up on the other side of the plug where I can't drill... How do I fix that?? Can I first drill with a 6mm bit that is longer for the sake of the screw?
Typically, rotary hammers are a better idea than hammer drills in concrete. But maybe you have a rotary hammer?
Usually, the solution is to have a long enough drill bit. Also, it's a bit odd that the screw is longer than the plug. Shorter screws?!
Drilling with a larger drill bit in a slightly smaller hole in hard and crack-prone materials like concrete can be tricky. The drill bit can get stuck in the hole and sometimes larger concrete pieces can crack off around the hole. But maybe this is mostly an issue with larger diameter holes? That's probably where I've encountered this.
Usually, the solution is to have a long enough drill bit. Also, it's a bit odd that the screw is longer than the plug. Shorter screws?!
Drilling with a larger drill bit in a slightly smaller hole in hard and crack-prone materials like concrete can be tricky. The drill bit can get stuck in the hole and sometimes larger concrete pieces can crack off around the hole. But maybe this is mostly an issue with larger diameter holes? That's probably where I've encountered this.
Hmm let me see if I have the possibility to find a longer drill... but I'm a bit doubtful right now. Otherwise, I'll probably have to try with 6mm first and then 8mm.
@Claes, I've read that the screw should be longer than the plug? So that the plug can expand or something like that... It was Hornbach that gave me these and they said just that, but what do I know.
@Claes, I've read that the screw should be longer than the plug? So that the plug can expand or something like that... It was Hornbach that gave me these and they said just that, but what do I know.
Smart alek
· östergötland
· 2 774 posts
What is the thickness of what you are going to screw in?
Biltema has an 8 mm drill bit with SDS+ fitting, 160 mm long for 40 SEK. You can find the equivalent product at Jula, Bauhaus, Hornbach, etc.
Then I probably would have chosen a screw with a different head (rounded) if I were to install a bracket, even though it works. Example: link
Then I probably would have chosen a screw with a different head (rounded) if I were to install a bracket, even though it works. Example: link
Keep it simple, take the avbitare and snap off a few mm from the screw, simplest fastest cheapest
