Machine Tap DIN 374 Form C 35° Spiral Flute HSSE - M 14 x 0.75

This designation is crucial for the tap's application and explains why it is ideally suited for blind holes.

• Form C: This describes the chamfer or lead of the tap. Form C has a short chamfer of about 2-3 threads. Because the threads engage the material quickly, you can cut the thread deeper into the blind hole, making optimal use of the available thread depth.
• 35° SP: The abbreviation "SP" stands for "Spiral Flute." The 35° angle is the helix angle of this flute. The spiral flutes have the important function of pulling chips upward and out of the blind hole, away from the cutting zone. This prevents chips from accumulating at the bottom of the hole, which drastically reduces the risk of tap breakage and improves the quality of the thread.

The DIN 374 is a standard that defines the dimensions and tolerances of machine taps for metric ISO fine threads.

For you, this means you can rely on standardized and reproducible quality. The standard ensures that all dimensions, such as the shank diameter, drive square, and overall length, precisely match the specifications. This is particularly important when you use the tap in a machine, as it guarantees a perfect fit and reliable performance.

• Thread Type: Metric ISO fine thread DIN 13
• Nominal Size: M 14 x 0.75
• Material: HSS-E (high-performance high-speed steel with cobalt content)
• Tolerance: ISO 2 / 6H
• Overall Length (L1): 100 mm
• Thread Length (L2): 10 mm
• Shank Diameter (D2): 11 mm
• Drive Square: 9 mm

What is a fine thread and where is it used?

A fine thread has a smaller pitch than a standard thread. It is used when you need a fine adjustment or a higher resistance to self-loosening, for example, in precision mechanical engineering, measuring instruments, or on thin-walled components.

Why is this tap ideal for blind holes?

The combination of the short chamfer (Form C) and the spiral flute with a 35° helix angle is the key advantage. The short chamfer allows for cutting deeper threads, while the spiral flute reliably transports the chips out of the blind hole, preventing tap breakage.

What does the material HSS-E mean?

HSS-E stands for "High Speed Steel with Cobalt." It is a high-quality high-speed steel with a cobalt content. This material is harder and more wear-resistant than conventional HSS steel, making it excellently suited for machining tough and high-strength materials.