Core Drill Bits
We stock and custom-manufacture diamond core drill bits from 1 inch all the way up to 36 inches in diameter. Engineered to bore clean, circular openings for plumbing conduits, electrical runs, HVAC penetrations, structural anchoring, and massive civil engineering cores through rebar-reinforced concrete, brick masonry, and stone. Standard 14" and 18" barrel depths with custom barrel lengths and segment matrices available upon request. For sizes up to 36" and specific aggregate formulations, call (661) 592-1022 for immediate pricing and jobsite availability.
Hollow Tube Design & Laser-Welded Sintered Segments
Mechanism of Action
Boring deep openings in reinforced concrete requires a tool that minimizes surface contact area to maintain drilling torque. The hollow steel tube design allows the bit to grind only the outer perimeter of the hole, leaving a solid core plug that is extracted afterward. The segmented teeth feature high concentrations of industrial synthetic diamonds bonded in a soft cobalt-iron alloy matrix, allowing the bit to slice through embedded steel rebar without binding, utilizing sintered bonds similar to our premium concrete cutting blades.
Operational Parameters
Wet core bits utilize continuous water flow inside the tube to cool the segments, flush out concrete slurry, and suppress silica dust. Large diameter core bits (10" to 36") are engineered with heavy-wall steel barrels and reinforced 1-1/4"-7 UNC or custom flanged connections to handle high-torque rig drilling under demanding civil engineering conditions.
Target Material Applications
- ✓ Boring concrete cores for electrical conduit, HVAC vents, and utility pipes (1" to 8")
- ✓ Large diameter penetrations for sewer mains, drainage pipes, and manhole coring (10" to 36")
- ✓ Boring large openings in reinforced concrete containing heavy structural steel rebar
- ✓ Structural anchoring holes, plumbing penetrations, and seismic tie-down coring
- ✓ Core sampling for geological concrete testing and structural inspection
- ✓ Boring dry or wet holes in clay brick masonry, block walls, and stone layers
⚡ Commercial & Heavy Civil Diameters: 1" to 36" Available
We stock standard sizes and custom-manufacture core drill bits up to 36 inches with custom barrel lengths and segment matrices for reinforced concrete.
Available Sizes & Direct Pricing
| Diameter Specification | Segment & Specs | Direct Pricing | Availability & Orders |
|---|---|---|---|
| 1" (25mm) | 10mm Segment · 14" Length · 5/8"-11 Threaded Arbor | 📞 Call for Pricing | |
| 1.5" (38mm) | 10mm Segment · 14" Length · 1-1/4"-7 Threaded Arbor | 📞 Call for Pricing | |
| 2" (50mm) | 10mm Segment · 14" Length · 1-1/4"-7 Threaded Arbor | 📞 Call for Pricing | |
| 2.5" (63mm) | 10mm Segment · 14" Length · 1-1/4"-7 Threaded Arbor | 📞 Call for Pricing | |
| 3" (75mm) | 10mm Segment · 14" Length · 1-1/4"-7 Threaded Arbor | 📞 Call for Pricing | |
| 3.5" (89mm) | 10mm Segment · 14" Length · 1-1/4"-7 Threaded Arbor | 📞 Call for Pricing | |
| 4" (100mm) | 10mm Segment · 14" Length · 1-1/4"-7 Threaded Arbor | 📞 Call for Pricing | |
| 5" (125mm) | 10mm Segment · 14" Length · 1-1/4"-7 Threaded Arbor | 📞 Call for Pricing | |
| 6" (150mm) | 10mm Segment · 14" Length · 1-1/4"-7 Threaded Arbor | 📞 Call for Pricing | |
| 7" (175mm) | 10mm Segment · 14" Length · 1-1/4"-7 Threaded Arbor | 📞 Call for Pricing | |
| 8" (200mm) | 10mm Segment · 14" Length · 1-1/4"-7 Threaded Arbor | 📞 Call for Pricing | |
| 10" (250mm) | 12mm Segment · 14" / 18" Length · 1-1/4"-7 Threaded Arbor | 📞 Call for Pricing | |
| 12" (300mm) | 12mm Segment · 14" / 18" Length · 1-1/4"-7 Threaded Arbor | 📞 Call for Pricing | |
| 14" (350mm) | 12mm Segment · 14" / 18" Length · 1-1/4"-7 Threaded Arbor | 📞 Call for Pricing | |
| 16" (400mm) | 12mm Segment · 14" / 18" Length · 1-1/4"-7 Threaded Arbor | 📞 Call for Pricing | |
| 18" (450mm) | 12mm Segment · 18" Length · 1-1/4"-7 Threaded Arbor | 📞 Call for Pricing | |
| 20" (500mm) | 12mm Segment · 18" Length · 1-1/4"-7 Threaded Arbor | 📞 Call for Pricing | |
| 24" (600mm) | 12mm Segment · 18" / 24" Length · 1-1/4"-7 Threaded Arbor | 📞 Call for Pricing | |
| 30" (750mm) | 12mm Segment · Custom Length · 1-1/4"-7 / Flanged | 📞 Call for Pricing | |
| 36" (900mm) | 12mm Segment · Custom Length · 1-1/4"-7 / Flanged | 📞 Call for Pricing |
📦 Wholesale Contractor Bulk Packs
Save on high-frequency utility cutting. Get factory-direct bulk rates on 5-Packs and 10-Packs. Call us direct for contractor discounts.
Blade RPM & Depth of Cut Calculator
Calculate optimal operating parameters for your Core Drill Bits.
Material Matching & Bond Selection Matrix
Pairing the correct bond hardness with your aggregate is essential for achieving optimal cutting speeds and maximizing blade lifespan.
| Job Site Material | Recommended Blade Type | Why This Spec Matters |
|---|---|---|
| Reinforced concrete | 2–6" Wet core bit | Water flushes slurry, cools segments, lets diamonds grind through rebar |
| Brick / block walls | 1–4" Dry core bit | Laser-welded segments for handheld rotary drilling without water access |
| Concrete test cores | 3–4" Precision core bit | Clean cylindrical samples for ASTM C42 compressive strength testing |
Verified Contractor Field Reports
Direct feedback from commercial cutting contractors across Southern California running Quality Diamond Blades on job sites.
"6-inch cores through 14 inches of reinforced concrete at a Valencia parking structure. Hit rebar 4 times, drilled right through. Bit still cuts clean."
"We run QDB core bits on all our HVAC penetration jobs. Consistent bore quality through multiple floors of commercial concrete."
Frequently Asked Questions
What size diamond core drill bits are available?
We stock and custom manufacture diamond core drill bits from 1 inch all the way up to 36 inches (900mm) in diameter. Standard sizes from 1" to 14" are readily stocked, while large-diameter commercial core bits (16" to 36") and custom barrel depths are manufactured with rapid turnaround. Call (661) 592-1022 for pricing, lead time, and availability on all sizes.
How does a diamond core bit handle structural steel rebar?
The high concentration of diamonds in the segments grinds through the steel rebar. When the bit hits rebar, the operator must slightly reduce feed pressure and let the diamonds grind through the steel without forcing the drill.
What is the difference between wet and dry core bits?
Wet bits require constant water feed to flush out slurry and cool the segments in hard reinforced concrete. Dry bits are used on handheld rotary drills to bore dry holes in brick, block, or soft masonry.
How do you extract a stuck concrete core plug?
If the concrete core plug is wedged inside the tube, tap the steel side of the barrel gently with a wooden block or slide a rod through the threaded arbor end to push the core plug out.
Technical Guides & Engineering Field Articles
In-depth contractor guides, safety standards, and operational parameters for Core Drill Bits.
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Equip Your Crew With Contractor-Grade Blades
Contact our Valencia technical specialists to discuss bulk contractor discounts, custom arbor sizes, and emergency job site delivery.
Call (661) 592-1022