Global Leading Diamond Tool Manufacturer.
Johnson Tools Premium 35mm Diamond Core Drill Bits for Granite, Quartz, and Marble - Dry Cutting, M14&1/2BSP Thread
Drill clean, fast holes in the hardest stone countertops with Johnson Tools Premium Dry Core Bits. Engineered for professional stone fabricators, these bits allow for Dry Drilling in Granite, Quartz, Marble, and Sandstone using a standard angle grinder.
Why Choose Our Premium Dry Bits?
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Dual Technology Construction:
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Sizes 6mm-18mm: Feature high-strength Silver Soldered Crown segments for stability in small holes.
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Sizes 20mm-100mm: Feature Laser Welded segments for maximum safety and heat resistance, combined with Vacuum Brazed Side Protection.
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Side Protection (Reaming): The vacuum brazed diamonds on the outside of the barrel (sizes 20mm+) allow you to ream (widen) holes and prevent the bit from binding deep in the stone, a critical feature for dry drilling.
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Fast & Clean: Designed for thinner stone applications (countertops/slabs), delivering a chip-free finish on entry and exit.
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Universal Fit: Available with M14 or 5/8"-11 threads to fit all standard angle grinders.
Technical Specifications:
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Diameter Range: 6mm - 100mm.
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Segment Height: 10mm.
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Connection: M14 or 5/8"-11 Female Thread.
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Technology:
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< 20mm: Silver Soldered Crown.
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≥ 20mm: Laser Welded Segment + Brazed Side Protection.
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Application: Granite, Quartz, Marble, Limestone.
Get In Touch With Us
PRODUCT ADVANTAGES
Our customer service team is a dedicated, hard-working group specially selected for their enthusiasm and commitment to providing excellent customer service. They offer advice, answer any queries.
PRODUCT parameter
| Dry core bits for granite | ||||
| Diameter | Segment Dimension | Teeth No. | Vacuum brazed Protect Teeth | |
| mm | Height | Thickness | ||
| 6 | 10 | 2 | Crown | —— |
| 8 | 10 | 2 | Crown | —— |
| 10 | 10 | 2 | Crown | —— |
| 12 | 10 | 2.5 | Crown | —— |
| 14 | 10 | 2.5 | Crown | —— |
| 16 | 10 | 2.5 | Crown | —— |
| 18 | 10 | 2.5 | Crown | —— |
| 20 | 10 | 2.5 | Crown | 4(O)2(I) |
| 25 | 10 | 2.5 | Crown | 4(O)2(I) |
| 32 | 10 | 3 | 4 | 4(O)2(I) |
| 35 | 10 | 3 | 4 | 4(O)2(I) |
| 38 | 10 | 3 | 4 | 4(O)2(I) |
| 50 | 10 | 3 | 5 | 4(O)2(I) |
| 60 | 10 | 3 | 6 | 4(O)2(I) |
| 70 | 10 | 3 | 7 | 4(O)2(I) |
| 80 | 10 | 3 | 8 | 4(O)2(I) |
| 90 | 10 | 3 | 9 | 4(O)2(I) |
| 100 | 10 | 3.5 | 9 | 4(O)2(I) |
product usage
Core Drilling for Thinner Stone Applications:
- Core drilling thinner applications of stone, including granite, marble, sandstone, limestone, and so on.
- Premium grade core bits that deliver fast drilling speed and extend product life.
- Use application with core drilling machines and hand drills.
- Production strictly according to customer requirements.
- Size could be customized.
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