DM M3 Ø2.7mm Long Thermal Drill Bits with Collar for High-Strength Thread Bushing Formation
Precision tungsten carbide thermal flow drill bits engineered for chip-free friction drilling and reliable thread forming 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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Overview & Operating Principle
The DM M3 Ø2.7mm Long Thermal Drill Bit with Collar utilizes friction-generated heat (thermal flow drilling/flowdrilling) to locally soften metal workpieces, displacing material to form a thick, continuous bushing without generating chips or waste. This process creates a strengthened wall that provides up to 3x the thread engagement length compared to original sheet metal thickness, making it ideal for M3 cold forming taps.
Crafted from premium micro-grain tungsten carbide (HRA 92+), these thermal drill bits eliminate the need for expensive rivet nuts, weld nuts, or press-fit inserts in thin-walled tubing and sheet metal applications.
Key Technical Advantages
- Zero Chip Waste: Thermal displacement creates clean, burr-free bushings without metal shavings, eliminating downstream cleaning and chip handling costs.
- Superior Mechanical Strength: Cold-forming work-hardens the displaced material, increasing thread pull-out force and torque load capacities by up to 50%.
- Integrated Surface Finishing: The collar feature automatically trims or turns down the raised surface ring during penetration to leave a neat collar or smooth seat.
- High Thermal Resistance: Engineered to withstand localized process temperatures reaching 600°C to 800°C while maintaining dimensional stability and geometric accuracy.
- Rapid Cycle Times: Creates a formed bushing in under 2 to 4 seconds, significantly boosting production throughput on automated CNC drilling and tapping centers.
Technical Specifications & Processing Parameters
| Parameter | Specification |
|---|---|
| Nominal Thread Size | M3 |
| Drill Diameter | Ø2.7 mm (+/±0.02mm) |
| Working Length | Long Series |
| Collar Finishing | Integrated Flat/Planed Trimming Collar |
| Substrate Material | Ultra-Fine Micro-Grain Tungsten Carbide |
| Optimum Spindle Speed | 2,800 – 3,800 RPM (Material Dependent) |
| Recommended Feed Rate | 120 – 250 mm/min |
| Tool Life | ~8,000 to 15,000 holes (Steel/Stainless) |
Selection Guide: Standard (Round) vs. Flat-Cut (Planed)
Selecting the right thermal flow drill bit geometry depends on your joint interface requirements:
- Standard (Round) Version: Displaces material both downward and upward, leaving a small raised ring on the top surface. Best for general structural joints where a flat mating face is not required.
- Flat-Cut (Planed) Version (With Collar): Simultaneously forms the lower bushing while flat-milling the upper rim in a single pass. Ideal for flush-surface assemblies, gasket seals, and precision-fitted mechanical components.
Industry Applications
- Automotive & Transportation: Exhaust manifolds, seat frames, chassis brackets, and fuel rail fixtures.
- HVAC & Heat Exchangers: Thin-walled manifold piping, heat exchanger plates, and liquid cooling systems.
- Aerospace & Electronics: Enclosure frames, lighting fixtures, and high-vibration structural joints.
- Structural & Metal Furniture: Stainless steel railings, tubular frame connections, and building hardware.
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 | M3 |
| Diameter | Ø2.7 mm |
| Finishing | with Collar |
| Materials | Tungsten Carbide |
| Brand | DUOMI ( DM ) |
| Quality Grade | A |
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 is the working principle of the DM M3 Ø2.7mm thermal drill bit?
What spindle speed and axial power are recommended for M3 thermal drilling?
What is the benefit of choosing a thermal drill bit 'with collar'?
How many cycles can I expect from a Grade-A DUOMI thermal drill bit?
Can thermal drill bits process stainless steel and high-temp alloys?
Is special lubrication required during thermal flow drilling?
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