Model NO.: DIN371 Spiral Flute Tap
Flute Type: Spiral Flute
Coating: TiCN/TiN/No Coating
Overall Length: 90 mm
Shank Diameter: 8 mm
Dk: 6.8 mm
Standard: Metric
Chamfer Type: C3 (3–5 threads)
Limit: 6h
Flute Length: 14 mm
Tang: 6.2 mm
Specification: M8
Application: Motorized
DIN371 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.
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| Size | L | Lc | Limit | d | k | dk |
| M2 | 45 | 6 | 6H | 2.8 | 2.1 | 1.6 |
| M2.5 | 50 | 7.5 | 6H | 2.8 | 2.1 | 2.05 |
| M3 | 56 | 6 | 6H | 3.5 | 2.7 | 2.5 |
| M3.5 | 56 | 6.5 | 6H | 4 | 3 | 2.9 |
| M4 | 63 | 7.5 | 6H | 4.5 | 3.4 | 3.3 |
| M5 | 70 | 8.5 | 6H | 6 | 4.9 | 4.2 |
| M6 | 80 | 11 | 6H | 6 | 4.9 | 5 |
| M7 | 80 | 11.5 | 6H | 7 | 5.5 | 6 |
| M8 | 90 | 14 | 6H | 8 | 6.2 | 6.8 |
| M10 | 100 | 16 | 6H | 10 | 8 | 8.5 |
