Quick Answer

Yes — you can drill a 150mm hole in a block wall dry with a dry diamond core bit, as long as you drill in short intervals (20-30 seconds on, pause to cool) and use a dust collector. Dry bits are made for brick, block and lightweight concrete. For dense reinforced concrete, use a wet bit instead.

Key Features of Dry Core Bits

• Segmented crown with open slots for dust evacuation.
• Works with handheld drills and core drill machines without water.
• Best for brick, aerated block, lightweight and normal block walls.
• Clean circular holes for vents, ducts, pipes and windows.

How to Drill a Block Wall Dry

• Mark the centre and fix a guide plate or pilot drill to stop wandering.
• Start at low speed with light pressure until the crown bites.
• Drill 20-30 seconds, then withdraw the bit to let it cool and clear dust.
• Keep the drill square to the wall — check with a level.
• Connect a dust collector adapter to the machine to control silica dust.
• When through the first leaf, check the cavity and drill the second leaf aligned.

Interval Drilling Table

Material	Drilling Interval	Recommended Bit Speed
Aerated block	20-30s on, cool 10s	Medium speed
Common brick	20-30s on, cool 10-15s	Medium speed
Dense block	15-25s on, cool 15s	Low-medium speed

Safety Tips

• Use a dust extractor or dust collector adapter — silica dust is a serious hazard.
• Wear a respirator rated for silica, plus eye protection.
• Anchor the machine; do not lean your body weight onto the bit.

Frequently Asked Questions

Q: Can a dry bit cut through the mortar joint?

A: Yes, but mortar is soft and abrasive — the bit may wander in the joint. Try to centre the hole in the block face.

Q: Do I need a pilot hole for 150mm?

A:A guide plate or a small pilot drill keeps the crown from skating. It is strongly recommended at 150mm.

Q: When should I switch to a wet bit?

A: For dense reinforced concrete, precast panels and asphalt. Dry drilling those overheats the bit. See our dry core bits and wet options for the full range.

Conclusion

Dry core bits drill clean holes in brick and block fast — keep the intervals short, the dust under control and the angle square. JOY TECH supplies dry core bits from 25mm to 200mm; contact us for distributor pricing.