Cặp mũi khoan taro BLUE RING M 3 x 0.5, DIN 371, HSS-E

What makes the TwinBox special:

• Đồng bộ chính xác: The included 2.5 mm Mũi khoan xoắn is the exact matching core hole size for the M3 thread. This guarantees optimal preparation and a perfect thread result.
• Highest material quality: The tap is made of HSS-Ea high-quality cobalt-alloyed high-speed thép. The addition of cobalt (HSS-E) significantly increases the hot hardness and wear resistance of the tool, making it ideal for processing tough and high-alloy materials.
• Specialist for lỗ bít: With its Form C and special cutting edge, the Mũi taro máy is optimally designed for cutting threads in lỗ bít. The integrated cross-ground tip of the drill ensures better centering and chip removal.

The standards DIN 371 & DIN 13:

• DIN 371: This standard defines the dimensions and tolerances of machine taps. Compliance with this standard ensures that the tool exactly meets industrial standards.
• DIN 13: This standard regulates the basic dimensions and profiles of ren hệ mét ISO. The designation "M 3 x 0.5" refers directly to this standard and defines the exact profile and tolerances of the thread to be cut.

With the TwinBox, you can create a thread in just two steps:

1. Drilling the core hole:
   • Securely clamp the Mũi khoan xoắn (2.5 mm) in the drill chuck.
   • Generously cool and lubricate the drill and your workpiece with cutting oil.
   • Drill the core hole to the desired depth with a steady feed. The 2.5 mm drill is perfectly sized for the M3 thread.
2. Cutting the thread:
   • Remove the drill and clamp the Mũi taro máy in the drill chuck.
   • Make sure you fix the workpiece cleanly.
   • Guide the tap into the core hole and start at a slow speed. Apply only light pressure, as the machine should control the feed.
   • Make sure you cut the thread to the correct depth. This is especially important for lỗ bít to avoid damaging the tool.
   • Carefully withdraw the tap and clean the thread of chips and oil.

1. What is the difference between HSS-E and HSS?
HSS-E (High-Speed thép, alloyed with cobalt) contains an addition of cobalt (Co). The cobalt improves the hot hardness and toughness of the thép, which makes the drill and tap more resistant at high cutting speeds and in tough, difficult-to-machine materials. Simple HSS is cheaper but less wear-resistant.

2. Why is the drill in the TwinBox 2.5 mm?
The size of the drill (the so-called core hole size) is crucial for the thread. For an M3 thread (ren hệ mét ISO with a 3 mm diameter), a core hole of 2.5 mm according to DIN 13 is the standard. A 2.5 mm diameter drill ensures that the thread is cut correctly and achieves full load-bearing capacity.

3. Is the TwinBox suitable for all materials?
The TwinBox is specially designed for machining wear-resistant steels up to 1200 N/mm², high-alloy steels, tough and stainless steels, as well as alloyed tool steels. For unalloyed or easily machinable steels up to approx. 800 N/mm², standard taps and drills are also suitable, but the HSS-E TwinBox offers a significantly longer tool life even here.

4. What does the cross-ground tip mean?
The cross-ground tip on the Mũi khoan xoắn is a special geometry at the drill point. It ensures that the drill centers itself and gets a better guide. This means you have to apply less pressure and drilling is more precise.

5. Can I also use the tap for lỗ thông?
Yes, the tap in the TwinBox can also be used for lỗ thông. However, it is specially optimized for lỗ bít, as its design directs chips out of the hole to the front, which reduces the risk of tool breakage.