Product Specification

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)

B. Small & Precision Sizes: DIN 371 (Reinforced Shank)

3. Differentiated Features & Process 

• 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.

• 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.

• 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.

• 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

• CNC Machining Centers: The go-to choice for automated VMC/HMC tapping where manual chip clearing is impossible.

• Critical Component Tapping: Used in automotive engine blocks, aerospace brackets, and hydraulic manifolds where blind-hole thread integrity is non-negotiable.

• 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.