| Size | P (mm) Pitch 螺距 | L (mm) 总长 | Lc (mm) 刃长 | Chamfer 切削锥 | d (mm) 柄径 | K (mm) 方头尺寸 | n 槽数 | Hole (mm) 底孔直径 | Tap limits 公差等级 |
| DIN371 |
|
| M3 | 0.5 | 56 | 11 | 5P | 3.5 | 2.7 | 3 | 2.5 | 6H |
| M4 | 0.7 | 63 | 13 | 5P | 4.5 | 3.4 | 3 | 3.3 |
| M5 | 0.8 | 70 | 16 | 5P | 6 | 4.9 | 3 | 4.2 |
| M6 | 1 | 80 | 19 | 5P | 6 | 4.9 | 3 | 5 |
| M8 | 1.25 | 90 | 22 | 5P | 8 | 6.2 | 3 | 6.75 |
| M10 | 1.5 | 100 | 24 | 5P | 10 | 8 | 3 | 8.5 |
| DIN376 |
|
| M12 | 1.75 | 110 | 29 | 5P | 9 | 7 | 4 | 10.25 | 6H |
| M14 | 2 | 110 | 30 | 5P | 11 | 9 | 4 | 12 |
| M16 | 2 | 110 | 32 | 5P | 12 | 9 | 4 | 14 |
| M18 | 2.5 | 125 | 34 | 5P | 14 | 11 | 4 | 15.5 |
| M20 | 2.5 | 140 | 34 | 5P | 16 | 12 | 4 | 17.5 |
| M22 | 2.5 | 140 | 34 | 5P | 18 | 14.5 | 4 | 19.5 |
| M24 | 3 | 160 | 38 | 5P | 18 | 14.5 | 4 | 21 |
DIN371 HSSE‑Co5% Spiral Point Form‑B Machine Tap follows DIN371 solid‑shank industrial standard. Manufactured of HSSE‑Co5% cobalt‑alloy high‑speed steel with precision grinding treatment.
Form‑B spiral‑point flute structure provides forward chip evacuation. Chips are pushed toward the hole exit rather than staying inside threaded cavity, effectively avoiding chip clogging. Sharp ground cutting edges deliver clean, accurate thread surface. Great red‑hardness enables stable performance for continuous CNC batch production for through‑hole threading. Commonly used for carbon steel, alloy steel and stainless‑steel workpieces.
Core Specifications
Standard: DIN371 (Solid Shank)
Material: HSSE‑Co5% (5% Cobalt High‑Speed Steel)
Tool Type: Spiral Point Form‑B Machine Tap
Geometry: Forward chip removal, for through‑hole only
Process: Precision grinding
Application: CNC machine tapping, through‑hole threading
Suitable Workpiece: Carbon Steel, Alloy Steel, Stainless Steel
Key Features
✅ DIN371 Solid‑Shank Standard: Strict dimensional control for consistent thread accuracy
✅ HSSE‑Co5% Cobalt Substrate: Excellent heat‑resistance and red hardness for long‑run machining
✅ Form‑B Spiral‑Point Flute: Forward chip ejection to prevent chip jam in through holes
✅ Precision‑Ground Cutting Edge: Sharp cutting performance, fine finished thread profile
✅ Optimized for Through‑Hole: Not suitable for blind‑hole tapping
✅ Machine tap for CNC mass‑production: Reliable performance for workshop batch threading jobs
Application Scenarios
Widely adopted in CNC machining shops, auto component manufacturing, mechanical hardware industry. Designed for tapping through holes on carbon steel, alloy steel and stainless‑steel parts.
Usage Note
Use proper tapping cutting fluid during machining. This spiral‑point tap is dedicated to through‑hole processing. Please set reasonable spindle speed and feed rate to reduce excessive tool heat and extend service life.