BLUE RING TwinBox Machine Tap + Twist Drill, DIN 371, HSS-E,  4 x 0.7

Highlights of the TwinBox:

• Ideal pairing: With the included 3.3 mm twist drill, you have the optimal core hole size for the M4 thread at your fingertips. This eliminates measurement errors and ensures a thread that perfectly meets the standards.
• Superior material: The tap is made of HSS-E, a high-performance high-speed steel alloyed with cobalt. The cobalt content improves toughness and heat resistance, which significantly extends the tool's service life, especially when processing hard and tough materials.
• Optimized for your projects: The TwinBox is the ideal solution for applications that require a thread in a blind hole (a bore that does not go completely through a workpiece). The tap is shaped to effectively guide the chips out of the hole to the front, which minimizes the risk of tool breakage.

The importance of standards DIN 371 & DIN 13:

• DIN 371: This standard is the benchmark for machine taps in Germany. It guarantees that the drill and tap have been manufactured according to precise specifications to ensure maximum compatibility and reliability.
• DIN 13: As an internationally recognized standard, DIN 13 defines the dimensions and profiles of metric ISO threads. The designation "M 4 x 0.7" confirms that the set is designed to produce this standardized and widely used type of thread.

Follow these simple steps for a successful application of the TwinBox:

1. Drilling the core hole:
   • Insert the twist drill (3.3 mm) into the drill chuck and make sure it is tight.
   • Use sufficient cutting oil to ensure cooling and lubrication.
   • Drill the core hole to the desired depth with constant pressure. The 3.3 mm size is precisely matched to the M4 thread.
2. Cutting the thread:
   • Replace the drill with the machine tap.
   • Secure your workpiece carefully to prevent movement.
   • Begin cutting at a low speed and let the machine handle the feed.
   • Cut the thread to the intended depth. This is especially important for blind holes to avoid damaging the tap at the bottom of the hole.
   • Carefully withdraw the tap after cutting and remove chips and oil.

1. Why is the twist drill in the TwinBox 3.3 mm?
The size of the twist drill is called the core hole size and is the basis for a perfectly fitting thread. For an M4 thread, the core hole size is defined as 3.3 mm according to DIN 13 to achieve optimal thread load-bearing capacity.

2. What distinguishes the TwinBox from other sets?
The VÖLKEL TwinBox offers a well-thought-out combination of a special machine tap for blind holes and the matching twist drill in the ideal core hole size. The coordinated tools made of high-quality HSS-E save time and guarantee professional results, especially when machining difficult materials.

3. Is the TwinBox suitable for manual applications?
The TwinBox is primarily designed for use with machines such as drilling machines or tapping machines, as the included tap has a special geometry for machine feed. A hand tap set is recommended for manual applications.

4. What is special about the HSS-E material quality?
HSS-E stands for "High-Speed Steel" with an addition of cobalt. This addition makes the tool extremely resistant to heat and wear. It is the ideal choice for processing high-strength, alloyed, and stainless steels that would be difficult to machine with standard HSS tools.

5. What does the tolerance ISO 2 / 6H mean?
The tolerance indicates how precisely the thread is cut. ISO 2 / 6H is a globally used standard tolerance for metric threads. It guarantees that the cut thread will fit perfectly with a corresponding standard thread and form a secure and functional connection.