DM M8 Ø7.3mm Tungsten Carbide Thermal Drill Bit with Collar
High-speed friction drilling solution engineered for chip-free hole forming and high-load M8 thread engagement in thin-walled metals.
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Features
Thermal Friction Flow Forming: Operates at 600°C+ to plasticize metal and extrude a strong threaded bushing in seconds.
Replaces Rivet & Weld Nuts: Creates a monolithic extruded boss with 3x the original sheet metal wall thickness.
Ultra-Hard Tungsten Carbide: Micro-grain solid carbide substrate provides extreme heat resistance and 10,000+ hole tool life.
Integrated Collar Trimming: Single-step bit trims displaced flash and forms a neat collar ring in one pass.
In-Depth Engineering Description & Technical Overview
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High-Performance M8 Ø7.3mm Thermal Flow Drilling Technology
The DM M8 Ø7.3mm Thermal Drill Bit with Collar leverages high rotational speed and axial pressure to generate localized frictional heat up to 600°C–800°C. This process plasticizes sheet metal and thin-walled tubing, forming a continuous extruded sleeve (bushing) below the workpiece that increases thread engagement length by 3x to 4x compared to conventional drilling.
Crafted from Grade A solid tungsten carbide under ISO 9001 certified manufacturing, this tool eliminates the need for expensive weld nuts, rivet nuts, or press inserts in structural metal assembly.
Key Technical Advantages & ROI Metrics
- Zero-Waste Hole Forming: 100% chip-free processing eliminates chip cleanup, secondary deburring, and machine downtime.
- Integrated Flat-Cut Collar: Simultaneously mills the top rim to create a clean, flush mounting surface in a single 2 to 5-second operation.
- Enhanced Thread Load Capacity: Formed bushings provide high pull-out force and torque resistance suitable for cold roll forming taps.
- Extended Tool Lifespan: Rated for 3,000 to 5,000+ operations under recommended spindle speeds (1,800–2,800 RPM) and proper thermal release paste application.
- High Precision: Maintains concentricity within ±0.02mm, optimizing fitment for automated assembly lines.
Standard vs. Flat-Cut Collar Selection
- Standard (Round) Version: Forms a drawn-out cylindrical sleeve underneath while leaving a raised thermal ring on the top surface.
- Flat-Cut (Planed Collar) Version (This Model): Features cutting edges on the collar shoulders that trim the raised material, creating a smooth, flush surface for seamless joint interfaces.
Material Compatibility & Recommended Parameters
This Ø7.3 mm friction drill bit is specifically dimensioned to prepare core holes for standard M8 cold-forming taps across various alloy compositions:
- Mild Steel & Structural Steel: Ideal for sheet thicknesses of 1.5 mm – 3.5 mm.
- Stainless Steel (304 / 316): Requires specialized high-temperature lubrication paste.
- Aluminum & Non-Ferrous Alloys: Prevents galling and material adhesion during rapid heat transfer.
- Specialty Alloys: Compatible with Titanium, Inconel, Hastelloy, and Copper alloys.
For smaller thread sizes, explore our Long-Life DM M6 Ø5.3mm Thermal Drill Bits. For heavy-duty steel profiles, consider the DM M10 Ø9.2mm Thermal Drill Bits.
Purchase & Delivery Guarantees
Direct Factory Assurance — Built, Tested, and Supported from Dongguan to Your Shop Floor
Runs on Your System
Standard GSK control (100% Fanuc G-code compatible) or optional Mitsubishi/Siemens. Direct CAD file import for code-free toolpath generation.
Factory Video FAT
Live drilling/tapping tests on your actual workpiece recorded before dispatch. Final 50% balance payment is paid only after your video approval.
40-Day Build & Rugged Crate
Guaranteed maximum 40-day manufacturing cycle. Sealed in anti-rust vacuum aluminum foil and bolted in fumigation-free timber crates (EXW/FOB/CIF).
Direct Engineer Care
Direct 1-on-1 WhatsApp group with your machine's build engineers, 12-month full warranty, and critical replacement parts dispatched via DHL within 24–48h.
Every DUOMI machine is built under a transparent 13-step factory production & responsibility chain.
Parameters
Download Technical Brochure| Thread Size | M8 |
| Diameter | Ø7.3 mm |
| Finishing | with Collar |
| Materials | Tungsten Carbide |
| Quality Grade | A |
| Brand | DUOMI ( DM ) |
Machining Samples
Real parts processed by our machines
Frequently Asked Questions
We “only” do drilling & tapping. Why do customers still choose Duomi over general-purpose CNC machines?
What does “Your part defines the solution” mean in practice?
What spindle speed and motor power are required for the DM M8 Ø7.3mm thermal drill bit?
Why is the Ø7.3 mm diameter specified for M8 thread forming?
What is the primary advantage of selecting a thermal drill bit with a collar?
How long does a Grade A Tungsten Carbide thermal drill bit last?
Can this bit be used on standard drill presses or CNC machines?
Is special lubrication required during the friction drilling process?
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