Diamond Diamond Core Drill Bit – Stone Core Drill

Johnson Tools Diamond Core Masonry Drill Bit | 6-100mm Crown Type Segment for Granite & Engineered Stone

In commercial countertop fabrication and luxury bathroom fit-outs, drilling clean, fracture-free cavities in high-density stone directly dictates project margin survival. The Johnson Tools Diamond Core Bit series is engineered with a specialized Crown Type Segment geometry. Engineered specifically to distribute mechanical shearing stresses across ultra-hard materials like Granite and Quartzite, it completely eliminates edge spalling and surface breakout. Covering a full SKUs continuum from 6mm to 100mm and utilizing calibrated industrial welding protocols, this line provides wholesale distributors with a high-margin, ultra-durable daily consumable for professional stone contractors.

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Diameter (mm)	Segment Dimension		Teeth No.	Vacuum brazed Protect Teeth
Diameter (mm)	Height	Thickness	Teeth No.	Vacuum brazed Protect Teeth
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	Crown	4 (O) 2 (I)
35	10	3	4	4 (O) 2 (I)
38	10	3	4	4 (O) 2 (I)
40	10	3	4	4 (O) 2 (I)
45	10	3	4	4 (O) 2 (I)
50	10	3	5	4 (O) 2 (I)
60	10	3	6	4 (O) 2 (I)
65	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)
135	10	3.5	10	—

Calibrated Diameter-Specific Welding Protocols
To counter the extreme rotational torque differentials between micro and macro coring cups, we enforce strict factory manufacturing standards:
- Diameters ≥ 20mm: Manufactured via 100% automated Laser Welding, guaranteeing zero segment detachment under high thermal dry-drilling stress.
- Diameters < 18mm: Securely bonded using high-tensile Silver Soldering, injecting industrial silver alloy into tight core cups to eliminate premature small-bit snapping.
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Universal Multi-Regional Fitment
Consolidate your global supply chain inventory with our universal drive options:
- M14 Thread: European and global standard angle grinder connection.
- 5/8″-11 Thread: North American commercial angle grinder standard.
- 1/2″ Straight Shaft: Integrates instantly into standard 3-jaw chuck hand drills and workshop drill presses.
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Crown Type Segment Geometry
Moving beyond standard flat segments, the corrugated crown profile creates an optimized, reduced surface area during initial surface engagement. This accelerates bite speed, prevents drill wandering, and opens highly efficient channels for slurry and stone dust evacuation. It delivers smooth penetration and zero-chipping margins whether running dry or under wet flood coolant.

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