BLUE RING Machine taps for blind holes (set of 7 pcs.) DIN 371/376 M 3 – M 12

BLUE RING Marking – Your Guide for Special Materials

The BLUE RING marking on the tap's shank is an established system in the industry for identifying taps for special applications. The blue ring generally stands for processing high-tensile, wear-resistant, and tough steels. VÖLKEL uses this marking to provide you with a tool that is precisely optimized for these difficult-to-machine materials. The special surface treatment or optimized geometry minimizes friction and wear. This leads to superior tool life and process reliability.

HSS-E – The Material That Makes the Difference

The tap is made of HSS-E (High-Speed Steel with Cobalt). The addition of cobalt increases the tool's hardness, hot hardness, and wear resistance. This ensures that the cutting edge maintains its sharpness and strength even under high thermal loads. This is a decisive advantage that significantly increases the tool's lifespan.

Form C 39° RSP – Optimal Chip Evacuation for Blind Holes

The designation Form C with 39° RSP (Right Spiral) describes the special geometry of the tap, which is the key for blind holes. Form C describes a lead of 2-3 threads, which facilitates the cutting process. The 39° RSP geometry effectively propels the chips backward and out of the hole. This prevents chip build-up at the bottom of the blind hole and prevents tool breakage.

Tolerance ISO2 / 6H – For Perfect Fit

The tolerance class ISO2 / 6H is the international standard for metric internal threads and guarantees a precise fit for standard screws. VÖLKEL's internal marking ISO2 confirms compliance with these high quality standards.

• Maximum Tool Life: Thanks to HSS-E material and BLUE RING specialization.
• Reliable Chip Evacuation: 39° RSP geometry for dependable work in blind holes.
• Highest Precision: Tolerance ISO2 (6H) for perfectly fitting threads.
• Efficient and Cost-saving: Fewer tool changes and lower risk of breakage.
• Complete Set: The 7 most important sizes in a sturdy cassette, ready for immediate use.

The VÖLKEL BLUE RING Machine Tap Set contains the following tools, all of which comply with the DIN 371/376 standard:

• 1x BLUE RING Machine Tap 39° RSP M3 HSS-E (Item No. 36426)
• 1x BLUE RING Machine Tap 39° RSP M4 HSS-E (Item No. 36430)
• 1x BLUE RING Machine Tap 39° RSP M5 HSS-E (Item No. 36434)
• 1x BLUE RING Machine Tap 39° RSP M6 HSS-E (Item No. 36438)
• 1x BLUE RING Machine Tap 39° RSP M8 HSS-E (Item No. 36442)
• 1x BLUE RING Machine Tap 39° RSP M10 HSS-E (Item No. 36446)
• 1x BLUE RING Machine Tap 39° RSP M12 HSS-E (Item No. 36450)

All taps and accessories can also be ordered separately.

Q: What is the difference between HSS and HSS-E?

HSS-E is an improved version of conventional HSS steel. It is additionally alloyed with cobalt, which makes it significantly harder, more wear-resistant, and more resistant to high temperatures.

Q: Can I also cut threads in stainless steel with this set?

Yes, the BLUE RING set is also suitable for short-chipping stainless steels. However, for long-chipping stainless steels, we recommend using special taps for Nirosta/stainless steel, which have an optimized geometry for these materials.

Q: Is this tap also suitable for through-holes?

Yes, you can also use it for through-holes. However, its strengths are particularly evident in blind holes, where the special geometry effectively evacuates the chips.

Q: What does the tolerance class ISO2/6H mean?

The tolerance class ISO2/6H is the standard for metric ISO threads. It ensures that the internal threads you cut will fit perfectly with standard external threads (e.g., screws).

Q: What lubricants should I use?

For the best results and maximum tool life, we recommend using a suitable cutting oil or cutting paste. This reduces friction, cools the tool, and facilitates chip evacuation.