Forming Tap vs Cutting Tap: Complete Guide
When it comes to internal threading, manufacturers face a key decision: forming taps (roll taps) vs cutting taps. Each has distinct advantages depending on the application, material, and production requirements. In this guide, we compare both types to help you make the right choice.
What Is a Forming Tap?
A forming tap (also called a roll tap or fluteless tap) creates internal threads by displacing material rather than removing it. The tap’s lobed design presses against the workpiece material, flowing it into the thread profile. No chips are produced.
Forming taps are available in American UNC/UNF, JIS Metric, and DIN Metric standards.
What Is a Cutting Tap?
A cutting tap removes material to create threads. It has flutes (grooves) that provide space for chips to escape. Cutting taps are the traditional choice for threading and work with virtually any material.
Key Differences: Forming Tap vs Cutting Tap
| Feature | Forming Tap | Cutting Tap |
|---|---|---|
| Chip formation | None (chipless) | Produces chips |
| Thread strength | Stronger (work-hardened) | Standard |
| Tool life | 3-5x longer | Baseline |
| Threading speed | 1.5-2x faster | Standard speed |
| Surface finish | Smoother | Good |
| Material limits | Steel, aluminum, copper, brass, SS | All materials |
| Blind hole suitability | Excellent (no chips) | Good (needs chip evacuation) |
| Workpiece hardness | Requires softer material (<32 HRC) | Works on harder materials |
| Hole preparation | Requires pre-form tap drill (larger) | Standard tap drill |
When to Choose Forming Taps
- Blind hole threading – no chips to evacuate
- High-volume production – longer tool life reduces downtime
- Soft to medium materials – aluminum, mild steel, copper, brass, stainless steel
- When thread strength matters – work-hardened threads resist fatigue
- High-speed CNC applications – run faster without chip issues
When to Choose Cutting Taps
- Hard materials (>32 HRC)
- Cast iron and brittle materials – forming can crack these
- Tapered threads – NPT, BSPT
- Low-volume jobs where tap cost matters more than tool life
Conclusion
For most modern manufacturing applications in steel, aluminum, and stainless steel, forming taps are the superior choice. They produce stronger threads, last longer, run faster, and eliminate chip problems. The only significant limitation is material hardness — if your workpiece exceeds 32 HRC, a cutting tap may be necessary.
Browse our HSSE forming taps or contact us for application-specific recommendations.