A quality diamond core bit typically drills 40-120 holes in reinforced concrete before it needs replacement, while a softer material like brick or block can stretch that to 200-400 holes. Exact life depends on the bond hardness, concrete aggregate, drilling technique, and whether water cooling is used.
| Material | Holes per bit (typical) |
|---|---|
| Soft brick / block | 200-400 |
| Plain concrete (C25/C30) | 80-150 |
| Reinforced concrete | 40-100 |
| Hard aggregate / granite concrete | 20-60 |
These numbers assume a professional wet-drilled job. Dry drilling cuts these figures roughly in half because heat degrades the diamond quickly.
Replace the bit when you see: bare steel showing through the segment, a noticeably slower cut, or the need for extra pressure to advance. Re-sharpening the segment (dressing) once or twice can add a few holes, but a glazed or bare segment will not recover.
A: Cut speed drops sharply, the bit glazes over, and you need to push hard. When steel appears on the segment surface, the bit is finished.
A: Usually yes - premium bits use better diamond concentration and a matched bond, which typically doubles the hole count of budget bits.
A: Sometimes. Dressing the segment on an abrasive block can restore cutting once or twice, but glazed or bare segments need replacement.
A: Yes - for production work choose a softer, faster-cutting bond; for occasional work a tougher bond lasts longer in storage and service.
Core bit life is mostly technique and matching: wet drilling, moderate pressure, correct bond, and avoiding rebar. JOY TECH offers wet and dry core bits with bond options for soft, medium and hard concrete - tell us your job and we will match the right tool.
