Diamond Core Drills
Core drilling is the category where failure is least forgiving: a bit that binds in reinforced concrete at height is a safety event, not a warranty claim.
What this category covers
Diamond core drill bits for construction and utility work:
- Wet core bits — for reinforced concrete, with water flushing through the bit
- Dry core bits — for masonry, brick and block, usually smaller diameters
- Segmented vs. turbo vs. continuous rim — segment type determines cutting behaviour and finish
- Extensions and adapters — the accessories that determine whether the system works at depth
Diameter and the power problem
Core bit diameter is not a free choice. It is constrained by the drilling machine’s torque and the spindle’s rated capacity. A 300 mm bit on an underpowered rig will bind, overheat the segments, and potentially damage the machine.
As a rough guide: bits above 150 mm generally require a rig with a rated capacity well beyond what handles 50–100 mm bits. If you are sourcing large-diameter bits for a customer, confirm the rig capacity before quoting — this is the single most common mismatch we see.
What determines bit life
Segment bond. Same logic as blades, but the consequences of getting it wrong are worse. A bond too hard for the aggregate will glaze and stop cutting; too soft and the segment is gone before the hole is through.
Segment height and count. More segments on a large bit distributes load but reduces flushing channel area. Flushing is not a detail — inadequate water flow is the leading cause of segment loss in wet drilling.
Core tube wall thickness. Thinner walls cut faster and flush better, but deflect more at depth. There is a real trade-off and the right answer depends on depth and tolerance.
Barrel and thread quality. The connection between bit and machine takes the torque. Poor thread machining shows up as runout and eventual failure.
Where it comes from
Henan and the surrounding provinces supply the majority of the world’s diamond core bits, alongside cutting blades. The segment sintering is the same industrial base; the tube and thread machining is often a separate specialist step.
What we verify
On core bits we inspect 100% of units for diameters above 200 mm: segment weld integrity, bore concentricity, thread condition and flushing channel clearance. Below that, sampling to ISO 2859-1 level II.
What we need to quote
Diameter, drilling depth, material (and whether reinforced), wet or dry, machine model or rated capacity, and the connection type. If you are matching an existing bit, the segment count and height from that bit is the most useful single piece of information.
Sourcing core bits? Send the drilling parameters and we will match them to factories that can hold the tolerance.
Ready to price your order?
Tell us the specification. Three to five factory quotes come back within five working days.