Do Thread Forming Taps Produce Chips?
Do thread forming taps create chips? Learn why forming taps are chip-free, key process differences vs cutting taps, real workshop data, and best use cases for mass CNC production.
A common question among CNC machinists and production managers is: Do thread forming taps produce chips during tapping?
The short and definitive answer is no. Unlike standard cutting taps that remove metal material, thread forming taps (also known as cold forming taps or roll taps) utilize a chipless cold extrusion process. They do not generate any metal chips, swarf, or debris during the entire threading cycle.
This fundamental difference is why forming taps have become the top choice for blind holes, deep holes, and high-yield mass production in ductile metals.
Why Thread Forming Taps Are 100% Chip-Free
Traditional fluted cutting taps carve away workpiece material to create thread profiles, which inevitably produces chips that require evacuation. In contrast, thread forming taps are fluteless and rely on metal plastic deformation.
The tap’s rounded lobes squeeze the pre-drilled hole wall, displacing metal outward and reshaping the grain structure to form complete internal threads. Since no material is removed, there are zero chips left inside the hole or on the workpiece.
Chip-Free Data Comparison: Forming Tap vs Cutting Tap
Real workshop production data clearly shows the performance gap caused by chip generation:
Machining Factor | Thread Forming Tap | Cutting Tap |
|---|---|---|
Chip Generation | None (0% debris) | Heavy chip production |
Blind Hole Failure Rate | 0.2% – 0.5% | 3% – 8% (chip clogging) |
Tap Breakage Risk | Very Low | High (trapped chips) |
Cleaning Downtime | Zero | Frequent cleaning required |
An electronics parts manufacturer previously used spiral flute cutting taps for M3 blind holes on 6061 aluminum enclosures. Trapped chips caused frequent tap breakage, and the scrap rate reached 4.2%.
After switching to DLC-coated thread forming taps, the process became completely chip-free. The factory eliminated chip jamming issues entirely, reduced scrap rate to under 0.4%, and extended tap lifespan from 600 holes to over 4,500 holes per tool.
This case proves that chip-free forming tapping greatly improves stability for small blind-hole threading.
Key Benefits of Chip-Free Thread Forming Taps
Key Benefits of Chip-Free Thread Forming Taps
The no-chip feature brings three core production advantages:
1. Perfect for blind and deep holes Without chip accumulation at the hole bottom, forming taps avoid jamming, thread damage, and sudden tool breakage.
2. Higher thread strength & smooth finish Cold forming compresses metal grains instead of cutting them, creating burr-free, fatigue-resistant threads with 15–20% higher pull-out strength.
3. Lower production cost No chip cleaning, no rework, and longer tool life significantly reduce downtime and tool replacement frequency.
Important Limitation to Note
Important Limitation to Note
While forming taps produce no chips, they only work on ductile materials such as aluminum, brass, copper, and mild steel. They are not suitable for brittle materials like cast iron or hardened steel, which cannot be plastically deformed.
Thread forming taps do not produce any chips. Their chipless cold forming mechanism makes them ideal for high-volume, blind-hole, and high-precision threading projects where chip pollution and tool breakage must be avoided.
If you need stable, long-life forming taps for your CNC production, contact our team for customized tool solutions and factory wholesale pricing.