Professional 35° Spiral Flute Taps DIN 371/376 | HSS-E M35 Material | High-Performance Blind Hole Tapping Solution
1. Introduction: The Professional Blind Hole Solution
The DIN 371/376 HSS-E M35 Spiral Flute Machine Taps are the definitive solution for high-speed, automated blind hole tapping. Featuring a precision-engineered 35° helix angle, these taps lift chips upward and out of the hole, preventing the catastrophic "chip-packing" that leads to tool breakage.
Forged from premium M35 Cobalt Steel (5% Co), this series offers the thermal stability required for machining work-hardening materials like Stainless Steel (304/316) and high-tensile alloys. Whether you are tapping delicate M2 electronics components or massive M42 industrial housings, our taps deliver consistent 6H precision.
2. Full Specification Breakdown: From Large to Small (M42 - M2)
Our production range covers the entire industrial spectrum, divided by DIN standards for optimized shank strength:
A. Large & Medium Sizes: DIN 376 (Reduced Shank)
| Size | Pitch (P) | Total Length (L1) | Thread Length (L2) | Shank Ø (D2) | Square (K) |
| M42 | 4.50 | 200 mm | 45 mm | 32.0 mm | 24.0 mm |
| M36 | 4.00 | 200 mm | 40 mm | 28.0 mm | 22.0 mm |
| M30 | 3.50 | 180 mm | 35 mm | 22.0 mm | 18.0 mm |
| M27 | 3.00 | 160 mm | 30 mm | 20.0 mm | 16.0 mm |
| M24 | 3.00 | 160 mm | 30 mm | 18.0 mm | 14.5 mm |
| M20 | 2.50 | 140 mm | 25 mm | 16.0 mm | 12.0 mm |
| M16 | 2.00 | 110 mm | 20 mm | 12.0 mm | 9.0 mm |
| M14 | 2.00 | 110 mm | 20 mm | 11.0 mm | 9.0 mm |
| M12 | 1.75 | 110 mm | 18 mm | 9.0 mm | 7.0 mm |
B. Small & Precision Sizes: DIN 371 (Reinforced Shank)
| Size | Pitch (P) | Total Length (L1) | Thread Length (L2) | Shank Ø (D2) | Square (K) |
| M10 | 1.50 | 100 mm | 15 mm | 10.0 mm | 8.0 mm |
| M8 | 1.25 | 90 mm | 13 mm | 8.0 mm | 6.2 mm |
| M6 | 1.00 | 80 mm | 10 mm | 6.0 mm | 4.9 mm |
| M5 | 0.80 | 70 mm | 8 mm | 6.0 mm | 4.9 mm |
| M4 | 0.70 | 63 mm | 7 mm | 4.5 mm | 3.4 mm |
| M3 | 0.50 | 56 mm | 5 mm | 3.5 mm | 2.7 mm |
| M2.5 | 0.45 | 50 mm | 4 mm | 2.8 mm | 2.1 mm |
| M2 | 0.40 | 45 mm | 4 mm | 2.8 mm | 2.1 mm |
3. Differentiated Features & Process
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High-Efficiency 35° Helix: Unlike standard 25° helixes, our 35° angle provides a faster "upward lift" for chips, specifically tested for long-chip materials like Stainless Steel and Aluminum.
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Vacuum Heat Treatment: Every tap is hardened in a state-of-the-art vacuum furnace to HRC 64-66. This ensures zero surface decarburization and a metallurgically stable core.
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Fully Ground Construction: Threads, flutes, and shanks are CNC-ground from a single hardened blank. This results in 6H Class Tolerance and a mirror-like surface finish that reduces friction heat.
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Red Hardness Advantage: The 5% Cobalt (HSSE) content allows the tool to maintain its cutting edge even when friction temperatures in the blind hole reach 600°C.
4. Strategic Industrial Applications
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CNC Machining Centers: The go-to choice for automated VMC/HMC tapping where manual chip clearing is impossible.
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Critical Component Tapping: Used in automotive engine blocks, aerospace brackets, and hydraulic manifolds where blind-hole thread integrity is non-negotiable.
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Difficult Materials: Engineered for Inox (304, 316), Titanium alloys, High-nickel alloys, and Structural Steel up to 1200 N/mm².
5. Packaging & Global Logistics
• Secure Individual Tubes: Every tap is vacuum-sealed and placed in a high-impact Rose-Box plastic case to protect the precision-ground spiral flutes.
• Anti-Rust Coating: Dipped in high-performance anti-rust oil, ensuring 36 months of safe storage in any global climate.
• OEM Customization: Since 1997, we have provided High-Definition Laser Marking (Brand Logo + HSSE + DIN Standard) for major B2B distributors.
6. Professional FAQ for Buyers
• Q: Why is the thread length shorter for smaller sizes (M3-M5)?
• A: This is a structural safety feature. In smaller sizes, shorter threads reduce the radial friction, which prevents the tap from "binding" and snapping under torque.
• Q: Can you provide batch-specific Material Test Reports (MTR)?
• A: Yes. We can provide full chemical analysis reports confirming the 5% Cobalt content for every major wholesale shipment.
• Q: How does the DIN 371 vs. DIN 376 shank difference benefit my customer?
• A: DIN 371's reinforced shank is much harder to twist or break in high-torque small-hole tapping. DIN 376's reduced shank allows for deep tapping in larger parts where the tool must pass through a guide or fixture.
Get in Touch
Have questions about our products or want to discuss a custom order? Our team is ready to help you.