BLUE RING Machine taps for blind holes (set of 14 pcs.) incl. drills DIN 371/376 M 3 – M 12

Applications:

• Wear resistant steels up to 1200 N/mm²
• High alloy steels
• Short-chipping materials
• Short-chipping stainless steels
• Alloy tool steels
• Optimised for blind holes (spiral flute Form C 39° RSP)

Benefits:

• HSS-E for high heat resistance and long tool life
• 39° spiral flute for secure chip evacuation out of blind holes
• BLUE RING identification for quick recognition of the application range
• Complete set M3–M12 including the correct twist drills
• Ideal for production, maintenance and toolmaking

1. Drill the core hole: Use the appropriate twist drill from the set (2.5 / 3.3 / 4.2 / 5.0 / 6.8 / 8.5 / 10.2 mm).
2. Chamfer the entry: A light chamfer helps to centre the tap and improves the thread start.
3. Clamp the tool: Securely clamp the tap in a suitable collet, chuck or quick-change system.
4. Set cutting parameters: Choose suitable cutting speed and feed for the material and coolant used.
5. Tap the thread: Tap with continuous feed, ensuring correct alignment and sufficient lubrication.
6. Retract the tap: Carefully reverse out of the blind hole without jerky movements.
7. Check the thread: Inspect with a matching screw or thread gauge.

• Brand: VÖLKEL – BLUE RING series
• Thread range: M3 – M12
• Thread type: Metric ISO
• Standards: DIN 371 (M3–M10), DIN 376 (M12)
• Form: Form C, 39° RSP spiral flute
• Material: HSS-E
• Application: Blind holes
• Workpiece materials: Wear resistant steels up to 1200 N/mm², high alloy steels, short-chipping stainless steels, alloy tool steels
• Included twist drills: 2.5 / 3.3 / 4.2 / 5.0 / 6.8 / 8.5 / 10.2 mm
• Set size: 14 pcs. (7 taps + 7 drills)
• Item number: 47867

• 1 × BLUE RING machine tap, DIN 371, HSS-E, M 3 × 0.5 (VÖLKEL 36426)
• 1 × BLUE RING machine tap, DIN 371, HSS-E, M 4 × 0.7 (VÖLKEL 36430)
• 1 × BLUE RING machine tap, DIN 371, HSS-E, M 5 × 0.8 (VÖLKEL 36434)
• 1 × BLUE RING machine tap, DIN 371, HSS-E, M 6 × 1.0 (VÖLKEL 36438)
• 1 × BLUE RING machine tap, DIN 371, HSS-E, M 8 × 1.25 (VÖLKEL 36442)
• 1 × BLUE RING machine tap, DIN 371, HSS-E, M 10 × 1.5 (VÖLKEL 36446)
• 1 × BLUE RING machine tap, DIN 376, HSS-E, M 12 × 1.75 (VÖLKEL 36450)
• Twist drills: 2.5 / 3.3 / 4.2 / 5.0 / 6.8 / 8.5 / 10.2 mm

Are these taps suitable for stainless steel?
Yes, they are designed for short-chipping stainless steels and other difficult materials.

Why a 39° spiral flute?
The 39° helix is optimised for chip evacuation from blind holes in tough, short-chipping materials.

Can I also use them in through holes?
Possible, but for through holes a straight flute or Form B tap is often more efficient.

Are the correct drill sizes included?
Yes, all required core hole twist drills from 2.5 mm to 10.2 mm are included.

Is coolant necessary?
Yes, we strongly recommend suitable cutting oil or coolant, especially in high alloy and wear resistant steels.