Product Specification

1. Introduction: The Ultimate Through-Hole Solution

Our DIN 371/376 Nitrided Spiral Point Machine Taps, commonly referred to as Gun Taps, are the industry standard for high-speed, high-efficiency through-hole threading. This tap features a straight flute designed to be stronger than a spiral flute tap, while the specialised spiral point geometry at the cutting face continuously pushes chips forward and out through the bottom of the hole. This eliminates chip evacuation issues, reduces torque load, and prevents tool breakage in CNC production lines.

2. Specialized Metallurgical Superiority

• Nitrided Surface Treatment: Nitriding is a thermochemical process that significantly increases the tap’s surface hardness up to HRC 68. This process drastically improves abrasion wear resistance, lowers the coefficient of friction, and prevents cold welding (chip bonding) when machining abrasive or "gummy" materials.

• High-Speed Steel Substrate: Forged from premium HSS (or HSSE), engineered to balance extreme hardness with necessary structural toughness.

• Fully Ground Precision: Every thread is CNC ground from a solid hardened blank to ensure zero surface decarburization, sharper cutting edges, and strict maintenance of the 6H tolerance class.

3. Deep Industrial Applications

• Target Materials: Specifically engineered for tough, abrasive, or "sticky" materials, including:

  • Gray Cast Iron & Ductile Iron: Nitriding’s extreme hardness resists the abrasive nature of iron particles.

  • Structural Steel & Carbon Steel: Optimal chip flow for long-chipping steels.

  • Non-Ferrous Metals (Brass, Copper Alloys): Improved sliding properties prevent galling.

• Applications: Essential for automated CNC machining, Vertical Machining Centers (VMC), and high-volume production environment like Automobile component manufacturing and General Machinery fabrication.

4. Packaging & Logistics for Wholes wholesalers

• Industrial Protection: Every tap is housed in a shockproof Rose-Box plastic case or vacuum-sealed square tube to prevent cutting edge collision during long sea transits.

• OEM Customization: We offer high-definition Laser Etching on shanks (Your Logo + Size + Substrate + DIN Standard).

• Distributor Support: Barcode labeling, private labeling, and reinforced master cartons are available to streamline your automated warehouse inventory management.

5. Professional FAQ for Buyers

• Q: When should I use Spiral Point instead of Spiral Flute?

  • A: Use Spiral Point (Gun Taps) for through-holes (chips push forward). Use Spiral Flute for blind holes (chips pull upward). Using a Gun tap for a blind hole will cause catastrophic failure as chips cannot escape.

• Q: How does Nitriding benefit my customers’ Tool Life?

  • A: For abrasive materials like gray cast iron, a nitrided tap typically provides 2x to 3x the tool life of a standard uncoated tap, significantly reducing the customer's "cost-per-hole."

• Q: What is the difference between DIN 371 and DIN 376?

  • A: DIN 371 has a reinforced shank for small sizes (usually up to M10) to prevent twisting. DIN 376 has a reduced shank for larger sizes (usually M12-M42) to allow tapping deeper holes without shank interference.