Model NO.: DIN376 spiral flute tap
Flute Type: Spiral Flute
Specification: M3.5
Coating: TiCN/TiN/No Coating
Overall Length: 56 mm
Shank Diameter: 2.5 mm
Dk: 2.9 mm
Type of Tap: Spiral Fluting Tap
Standard: Metric
Chamfer Type: C3 (3–5 threads)
Limit: 6h
Flute Length: 6 mm
Tang: 2.1 mm
Material: High-Speed Steel
Application: Motorized
DIN376 Spiral flute tap
Spiral Flute Design
High-Efficiency Chip Evacuation: Spiral flutes optimize chip flow, preventing clogging in blind holes.
Reduced Cutting Resistance: Continuous cutting minimizes vibration for smoother threads.
Material & Coating
Cobalt HSS (HSS-E): Hardness 63-65 HRC with 30% higher wear resistance for tough materials.
Optional TiN/TiCN Coating: Reduces friction and extends tool life in dry/MQL machining.
Precision Threads
Ground Thread Profile: Complies with DIN376 standard, achieving 6H tolerance for precise fit.
High-Speed Machining
Speed Capacity: Up to 20 m/min for carbon steel and 15 m/min for stainless steel.
CNC Compatibility: Ideal for automated production with reduced tool changes.
TYPICAL APPLICATION SCENARIOS
Automotive Manufacturing
Engine Blocks & Gearbox Housings: Blind hole threading in aluminum alloy/cast iron.
Aerospace
Titanium Fasteners & Aerospace Aluminum: Precision threading for critical components.
Electronics
5G Heatsinks & Micro-Connectors: Threading small sizes (M1-M3) with high accuracy.
Heavy Machinery
Hydraulic Valve Blocks & Pump Bodies: Deep hole threading (depth ≥1.5×D).
General Machining
Stainless Steel (SUS304) & Alloy Steel (42CrMo): High-volume production of threaded parts.
Product Parameters
 |
 |
| Feature | DIN376 Spiral Flute Tap | Standard Straight Tap |
|---|---|---|
| Blind Hole Chip Flow | Efficient spiral evacuation | Prone to clogging |
| Cutting Speed | 20%-30% faster | Standard speed |
| Surface Finish | Ra≤1.6μm | Ra≤3.2μm |
| Size | L | Lc | Limit | d | k | dk |
| M3 | 56 | 5 | 6H | 2.2 | – | 2.5 |
| M3.5 | 56 | 6 | 6H | 2.5 | 2.1 | 2.9 |
| M4 | 63 | 7 | 6H | 2.8 | 2.1 | 3.3 |
| M4.5 | 70 | 8 | 6H | 3.5 | 2.7 | 3.7 |
| M5 | 70 | 8 | 6H | 3.5 | 2.7 | 4.2 |
| M6 | 80 | 10 | 6H | 4.5 | 3.4 | 5 |
| M7 | 80 | 10 | 6H | 5.5 | 4.3 | 6 |
| M8 | 90 | 13 | 6H | 6 | 4.9 | 6.8 |
| M9 | 90 | 13 | 6H | 7 | 5.5 | 7.8 |
| M10 | 100 | 15 | 6H | 7 | 5.5 | 8.5 |
| M11 | 100 | 15 | 6H | 8 | 6.2 | 9.5 |
| M12 | 110 | 18 | 6H | 9 | 7 | 10.2 |
| M14 | 110 | 20 | 6H | 11 | 9 | 12 |
| M16 | 110 | 20 | 6H | 12 | 9 | 14 |
| M18 | 125 | 25 | 6H | 14 | 11 | 15.5 |
| M20 | 140 | 25 | 6H | 16 | 12 | 17.5 |
| M22 | 140 | 25 | 6H | 18 | 14.5 | 19.5 |
| M24 | 160 | 30 | 6H | 18 | 14.5 | 21 |
Hegong specializes in high-quality threading tools, including machine taps, hand taps, straight flute taps, spiral flute taps, spiral point taps, and forming thread taps, serving global markets with precision and reliability.
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