Metric spiral flute tap
Key Features
- Upward Spiral Flute Design : Optimized spiral angle ensures smooth upward chip removal, perfect for blind hole threading, no chip accumulation at the hole bottom.
- Premium Raw Material : Adopts high-quality HSS or HSS-E cobalt high-speed steel, excellent hardness, toughness and heat resistance, resistant to breakage during continuous tapping.
- Multiple Functional Coatings Optional : Oxide, TiN, TiCN, TiAlN and stainless steel special anti-stick coatings, meeting different material processing needs.
- Fully Precision Ground : Integral grinding process ensures sharp cutting edge, low tapping torque, burr-free and high-precision 6H standard threads.
- High Compatibility : Standard metric thread sizes, compliant with DIN371 / DIN376 / ISO standards, suitable for most CNC machines and automatic lathes.
Technical Specifications
|
Item |
Specification |
|
Product Name |
Metric Spiral Flute Machine Tap |
|
Thread Standard |
Metric ISO Standard (Coarse / Fine Pitch) |
|
Material |
HSS M2 / HSS-E M35 Cobalt High Speed Steel |
|
Available Coatings |
Black Oxide, TiN (Gold), TiCN (Rainbow), TiAlN, SUS Special Coating |
|
Flute Type |
Right-hand Spiral Flute (for blind hole) |
|
Helix Angle |
35° Standard (optimized for chip removal) |
|
Thread Tolerance |
6H (Standard) |
|
Hardness |
HRC 63–67 |
|
Applicable Hole |
Blind Hole |
|
Size Range |
M2–M20 (Custom sizes available) |
Applicable Materials & Application Scenarios
Processable Materials:
- ✅ Mild steel, medium carbon steel, high carbon steel
- ✅ Alloy steel, pre-hardened steel
- ✅ Cast iron, ductile iron
- ✅ SUS303, 304, 316 stainless steel (with special coating)
- ✅ Brass, copper and other non-ferrous metals
Application Scenarios: CNC machining centers, automatic lathes, mechanical parts processing, automotive parts, hydraulic components, electronic hardware and general industrial mass production.
Standard Tap Drill Size Chart (Metric Coarse Thread / 75% Thread Engagement)
Recommended bottom hole diameter for standard carbon steel processing; enlarge 5%–10% for stainless steel to avoid tap breakage.
|
Thread Size |
Pitch |
Standard Drill Size (mm) |
|
M2 |
0.4 |
1.6 |
|
M2.5 |
0.45 |
2.05 |
|
M3 |
0.5 |
2.5 |
|
M4 |
0.7 |
3.3 |
|
M5 |
0.8 |
4.2 |
|
M6 |
1.0 |
5.0 |
|
M8 |
1.25 |
6.8 |
|
M10 |
1.5 |
8.5 |
|
M12 |
1.75 |
10.2 |
|
M14 |
2.0 |
12.0 |
|
M16 |
2.0 |
14.0 |
|
M18 |
2.5 |
15.5 |
|
M20 |
2.5 |
17.5 |
Processing Tips
- For carbon steel : Use TiN / Oxide coating, standard speed and standard bottom hole size.
- For stainless steel : Choose TiCN / SUS anti-stick coating, reduce speed to 50%–70%, enlarge bottom hole and use extreme pressure tapping oil.
- For hardened steel : Adopt TiAlN coating for high temperature resistance and wear resistance.
