DIN 371/376 HSS-E M35 TiN Coated Spiral Flute Taps | M2-M42 Cobalt Machine Taps for Blind Holes
1. Introduction: The Gold Standard for Blind Hole Tapping
Our DIN 371/376 HSS-E M35 TiN Coated Spiral Flute Taps represent the ultimate fusion of metallurgical toughness and advanced surface coating technology. Designed specifically for blind-hole applications in high-volume CNC environments, these taps feature a 35° helix angle that pulls chips upward with mechanical precision.
The addition of 5% Cobalt (M35) combined with a Titanium Nitride (TiN) coating provides a dual layer of protection: extreme heat resistance and an ultra-low friction coefficient, making this tool the "Gold Standard" for machining stainless steel and high-tensile alloys.
2. Technical Specifications (M2 - M42 Range)
| Size Range | Pitch (P) | DIN Standard | Shank Type | Total Length (L1) | Thread Length (L2) |
| M2 - M2.5 | 0.40 - 0.45 | DIN 371 | Reinforced | 45 - 50 mm | 4 - 5 mm |
| M3 - M6 | 0.50 - 1.00 | DIN 371 | Reinforced | 56 - 80 mm | 5 - 10 mm |
| M8 - M10 | 1.25 - 1.50 | DIN 371 | Reinforced | 90 - 100 mm | 13 - 15 mm |
| M12 - M16 | 1.75 - 2.00 | DIN 376 | Reduced | 110 mm | 18 - 20 mm |
| M20 - M24 | 2.50 - 3.00 | DIN 376 | Reduced | 140 - 160 mm | 25 - 30 mm |
| M30 - M42 | 3.50 - 4.50 | DIN 376 | Reduced | 180 - 200 mm | 35 - 45 mm |
3. The TiN (Titanium Nitride) Advantage
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Friction Reduction: The smooth TiN coating (Gold surface) reduces the coefficient of friction, preventing "chip welding" and built-up edges, which is critical when tapping "gummy" materials like aluminum or stainless steel.
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Surface Hardness (HRC 80+): While the core is a tough M35 alloy, the TiN coating provides a surface hardness exceeding 2300 HV, protecting the cutting edges from premature abrasive wear.
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Superior Heat Shield: TiN acts as a thermal barrier, reflecting heat back into the chips rather than the tool, allowing for higher spindle speeds and significantly longer tool life in automated CNC production.
4. Optimized Industrial Applications
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Stainless Steel (Inox): Highly effective for 304, 316, and other work-hardening steels that generate intense heat.
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Difficult-to-Machine Alloys: Ideal for alloy steels, titanium, and heat-resistant castings with tensile strengths up to 1200 N/mm².
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High-Speed CNC Production: Specifically engineered for vertical and horizontal machining centers where "tool-change downtime" must be minimized.
5. Manufacturing & Quality Control
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HSS-M35 (5% Cobalt): Genuine HSSE substrate ensures the tap remains structurally sound under the high radial torque of blind-hole tapping.
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Fully Ground Construction: Every tap is CNC-ground from a solid hardened blank to maintain 6H Tolerance Class and perfect concentricity.
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Vacuum Heat Treatment: Controlled hardening process ensures a stable HRC 64-66 core hardness before the PVD coating process.
6. Professional FAQ for Wholesalers
Q: How does the TiN coating compare to a Nitrided surface?
A: TiN is a PVD coating that offers a much harder surface and lower friction than nitriding. It is better for high-speed machining where heat dissipation is the primary concern.
Q: Why do you use DIN 371 for smaller sizes?
A: The Reinforced Shank of DIN 371 (M2-M10) provides the torsional rigidity needed to prevent the "winding" effect and snapping that often occurs in small-hole high-speed tapping.
Q: Can you provide customized packaging for our brand?
A: Yes. We offer OEM branding (Laser Marking on shanks) and customized labels for our shockproof Rose-Box plastic packaging to help you build your local market presence.
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