Diamond Core Drill Bits

A diamond core drill bit is a hollow cylindrical tool with diamond-impregnated segments on its cutting face. It is designed to cut precise, clean, round holes in hard materials by removing a solid core. Common applications include:

• Plumbing & HVAC: Drilling pipe runs through concrete floors and walls
• Electrical: Creating conduit openings in reinforced concrete
• Structural: Bridge deck sampling, anchor bolt holes, and structural testing
• Construction: Window/door openings, manhole covers, utility penetrations
• Geological: Core sample extraction for site investigation

Diamond core bits deliver vibration-free, dust-controlled drilling with no structural damage to the surrounding material.

Wet core bits require a continuous water supply during drilling. Water serves three critical functions: cooling the diamond segments, flushing debris from the hole, and exposing fresh diamond cutting surfaces. Wet bits are designed for reinforced concrete, granite, and other hard materials.

Dry core bits are designed for use without water, typically in brick, block, and soft masonry. They feature spiral barrels or side vents that allow air circulation for cooling and dust ejection. Dry bits are ideal for indoor work where water would cause damage.

Important: Never use a wet-designated bit without water — it will cause segment glazing, overheating, and premature failure.

We offer three standard thread connections:

• 1-1/4" UNC (Female): The global standard for professional core drilling rigs. Used for bits Ø40mm and above. Most common in construction and industrial applications.
• 1/2" BSP (Female/Male): Common in Europe and Asia for smaller handheld core drills. Used for bits Ø25–80mm.
• 5/8"-11 UNC: Used primarily in North America for smaller diameter bits and angle grinder-mounted coring.

We also manufacture custom adapters to convert between thread standards.

We offer multiple segment designs optimized for different materials:

• Crown Segment (Standard): General-purpose flat segments for everyday concrete and masonry coring. Economical and reliable.
• Turbo Segment: Aggressive wave-pattern segments for faster cutting in hard materials. Higher diamond concentration for extended life.
• Groove Turbo Segment: Features cooling grooves cut into the turbo pattern, reducing heat buildup. Best for reinforced concrete with heavy rebar.
• Sharp Corner Segment: Beveled edges for faster initial penetration and reduced breakout chipping.

General rule: Softer materials (brick, block) → Crown segments. Harder materials (reinforced concrete, granite) → Turbo or Groove Turbo segments.

Follow these guidelines for maximum bit life:

• Water Flow: Maintain adequate water pressure (2–4 L/min for small bits, 6–10 L/min for large bits). Water must flow continuously — never let the bit run dry.
• Drilling Speed (RPM): Follow the recommended RPM chart. General rule: larger diameter = lower RPM. Ø50mm ≈ 800 RPM, Ø100mm ≈ 400 RPM, Ø200mm ≈ 200 RPM.
• Feed Pressure: Apply steady, moderate pressure. Let the diamonds do the cutting — excessive force causes overheating and premature wear.
• Starting: Begin at a slight angle or use a guide/jig to prevent the bit from walking on flat surfaces.
• Rebar: Slow down when hitting rebar. The change in sound and vibration is your signal to reduce RPM and pressure.

Our standard core bits provide working depths of 300mm, 400mm, or 450mm (effective cutting length). For deeper applications:

• Tube Extensions: We offer extension rods that increase drilling depth in 300mm or 500mm increments.
• Custom Barrels: We can manufacture barrels up to 1000mm overall length for special deep-drilling applications.
• Multi-pass drilling is possible with extension rods, enabling depths of 1 meter or more.

Note: Deep drilling requires higher water flow rates from multiple directions and slower RPM to maintain cooling effectiveness.

Yes, our wet core drill bits with Turbo or Groove Turbo segments are specifically designed to cut through reinforced concrete containing steel rebar. Key points:

• Laser welding ensures segments remain securely attached even when hitting rebar at high speed.
• The diamond matrix is formulated to cut both concrete and mild steel rebar without segment loss.
• When cutting through rebar, expect reduced cutting speed (approximately 30–50% slower than plain concrete) and slightly increased segment wear.
• For heavy rebar concentration, we recommend Groove Turbo segments for optimal heat management.

Note: Core bits are NOT designed for cutting hardened steel, stainless steel, or structural steel beams.

Yes, we provide full OEM/ODM services including:

• Custom Diameters: Any diameter from Ø16mm to Ø600mm
• Custom Lengths: Barrel lengths from 150mm to 1000mm
• Custom Segments: Tailored diamond concentration, grit size, and bond hardness for specific materials
• Private Labeling: Your brand, logo, and color scheme on the product and packaging
• Custom Threads: Any thread standard including 1-1/4" UNC, 1/2" BSP, 5/8"-11, M18, or proprietary connections
• MOQ: Starting from 50 pieces per specification for standard products

Our engineering team will work with you to develop the optimal segment formula for your target market.