Wholesale DM M4 Ø3.7mm Long Flat Thermal Friction Drill Bits
High-Efficiency Chipless Hole Forming & Surface Planarization for Metal Fabrication & Tubing
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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.
Flat-Mouth Flush Seating: Produces a clean, flat counterbored rim ideal for flush fastener seating without raised collars.
In-Depth Engineering Description & Technical Overview
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Overview
The DUOMI DM M4 Ø3.7mm Long Flat Thermal Friction Drill Bit utilizes friction heating (600°C–800°C) to locally plasticize sheet metal and thin-walled tubing, forming a high-strength extruded bushing in seconds. Designed with a integrated flat-mouth planed collar cutter, this tool simultaneously forms the threaded sleeve and trims the surface flush to deliver a smooth, burr-free finish.
Crafted from premium solid tungsten carbide, the M4 Ø3.7mm friction drill provides exceptional heat resistance and wear life across automated CNC centers, standard milling machines, and high-speed drilling rigs.
Key Advantages & Performance
- Chipless Forming: Eliminates metal chips and waste removal, ensuring clean operation and extended tool life.
- 3x Thread Strength: Creates an extruded bushing 3 to 4 times thicker than the original sheet material, allowing full ISO metric M4 thread engagement without weld nuts or rivet inserts.
- Integrated Surface Planarization: Flat-type geometry trims the top collar flat during the plunge cycle, leaving a flush surface ideal for seated fasteners and fluid-tight gaskets.
- High Speed & Efficiency: Cycle times under 2–4 seconds per hole, dramatically reducing cost-per-hole in high-volume production.
- Universal Compatibility: Works seamlessly on CNC machines, specialized flow drilling units, and manual drill presses equipped with high-rpm spindles.
Technical Specifications & Operating Parameters
| Parameter | Specification |
|---|---|
| Tool Diameter | Ø3.7 mm (+0.00/-0.02 mm) |
| Metric Thread Size | M4 (0.7 Pitch) |
| Geometry Type | Long Flat (Planed Collar) |
| Substrate Material | Micrograin Tungsten Carbide |
| Recommended RPM | 2,400 – 3,200 RPM |
| Feed Rate | 150 – 300 mm/min |
| Processing Capability | Sheet thickness 0.8 mm – 3.0 mm |
Target Applications & Industries
- Automotive & Transportation: Structural frame joining, exhaust manifolds, and fluid lines.
- HVAC & Heat Exchangers: Thin-walled copper and stainless steel liquid-cooling tubes.
- Furniture & Metal Fabrication: Architectural stainless components and heavy-duty frame joints.
- Aerospace & Industrial Machinery: Bearing housings, mounting brackets, and multi-layer structural assemblies.
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 | M4 |
| Diameter | Ø3.7 mm |
| Finishing | Plane Surface |
| Materials | Tungsten Carbide |
| 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 is the difference between a flat thermal friction drill and a standard thermal drill?
What spindle speed and power are required for the M4 Ø3.7mm thermal drill bit?
Which metals can be processed with this thermal friction drill bit?
How long does a DUOMI M4 thermal friction drill bit last?
Can I perform cold thread tapping after friction drilling?
Are custom non-standard sizes or OEM branding options available?
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Wholesale DM M4 Ø3.7mm Long Flat Thermal Friction Drill Bits
