About Flowdrill
Flowdrill Friction-Drilling & Flow-Drill Fastening Solutions
Flowdrill manufactures solid carbide friction-drilling (also called flow-drilling or thermal-drilling) tools that locally displace material to form increased material thickness and create a secure threaded fastening connection, eliminating the need for traditional rivnuts, weld nuts, or press nuts. Available in diameters from 1.8mm to 40mm and compatible with material thicknesses from 0.5mm to 10mm, Flowdrill tools create Class 8 fastening connections in steel, stainless steel, aluminum alloys, copper, and some brass materials without additional components or pre-machining.
Friction drilling generates localized heat at the tool tip (typically 800–1200°C) that softens the workpiece material; the tool simultaneously displaces that softened material downward and outward, creating a material bulge (upset) around the hole. As the tool retracts, the material cools and hardens, forming a self-tapped threaded hole ready for standard fasteners or integral screw fastening. The process requires no subsequent tapping, reaming, or finishing steps.
Flowdrill tooling is compatible with CNC machining centers, manual mills, lathes, automated robotic arms, and custom-built dedicated drilling systems. Single tools typically generate 500–2,000 holes before wear-out (depending on material hardness and hole count); replacement tooling is economical compared to the capital cost of traditional nut-insertion or weld-nut equipment.
Automotive and aerospace applications include structural-panel fastening (body panels, floor pans, fuselage sections), electrical-harness grounding points, and lightweight-structure fastening where traditional rivets or fasteners add weight or cost. The high-speed process (tool cycle 1–3 seconds per hole) enables high-volume production integration and is particularly advantageous for vehicle lightweighting programs that substitute aluminum for steel.
ChatMRO's AI procurement assistant lets you specify your material type, target bore diameter, thickness range, and fastener class requirement, and instantly retrieves matching Flowdrill tools, compatible spindle speeds, and feed-rate settings from our indexed catalog. Technical advisors can guide tool selection per your workpiece material hardness and production volume to optimize tool life and cost per hole.
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Frequently asked questions
What spindle speed and feed rate should I use for Flowdrill friction drilling?
Flowdrill tools are typically run at 500–3,000 RPM depending on bore diameter and material (higher speed for aluminum, lower for stainless steel and copper); exact speeds are provided in Flowdrill's material-specific tool documentation. Feed rate is typically 0.5–3 mm/second (adjustable per machine and material). Higher speeds accelerate tool wear; running too slowly generates insufficient frictional heat and produces incomplete material displacement. Always test a sample part and inspect the threaded hole for full engagement before production runs.
What's the advantage of friction drilling vs. traditional self-tapping screws?
Friction drilling displaces base material to create a hardened, high-strength threaded connection (Class 8 equivalent), while self-tapping screws cut threads in the surrounding material and rely on tap geometry—friction-drilled holes support higher clamp loads and vibration resistance. Self-tapping is faster (no tool cycle time) but limited to thin materials; friction drilling excels in 1–5mm sheet where traditional tapping risks thread stripping or tool breakage.
Can Flowdrill tools be used on composite materials or cast metals?
Flowdrill tools are designed for wrought metals (steel, aluminum, copper, brass) where material displacement and hardening occur. Composites and cast materials are brittle and don't deform/harden the same way; attempting friction drilling on these materials risks tool breakage and poor-quality holes. Traditional drilling + threading, rivnuts, or threaded inserts are appropriate for composite and cast-metal applications.
How many holes can a single Flowdrill tool produce before tool change?
Tool life typically ranges 500–2,000 holes depending on bore size, material hardness, spindle speed, and feed rate. Aluminum and softer metals allow 1,000–2,000 holes; stainless steel and hardened steel reduce tool life to 300–800 holes. Tool cost amortized over hole count is typically $0.10–$0.50 per hole (including tool replacement), significantly lower than capital equipment for traditional nut-insertion systems and eliminating secondary operations.
What happens if I run a Flowdrill tool at too high or too low a spindle speed?
Too-high spindle speed accelerates tool wear and generates excessive heat, potentially melting the carbide or workpiece material (visible as discoloration or deformation around the hole). Too-low speed produces insufficient frictional heat, resulting in incomplete material displacement, shallow threading, or poor-quality connections prone to screw stripping. Always start at Flowdrill's recommended speed range and make small adjustments while monitoring part quality and tool condition.