Fully ground HSS Co Step twist drill bit

Featuers:

1.High Speed Steel (HSS) Co M35 Material

2.FULLY GROUND

3.TWO-STEP DESIGN

4.Efficient chip evacuation

5.EXCELLENT DURABILITY

6.Suitable for Hard Materials:

Technical Data

• Size: Two-step diameters cover common metric ranges like 3.4×6.5mm (for M3) to 14×20mm (for M12); overall length 40 – 100mm, with flute length matching step design for chip removal.
• Material & Process: HSS M35 with 5% cobalt; fully ground; 135° split point; straight or 1/4-inch hex shank.
• Others: H8 tolerance; surface often with amber finish; right-hand spiral flutes; compliant with DIN 338 standard.

Advantages

• Two-step efficiency: Drills two-sized holes (e.g., pilot and final hole) in one pass, skipping bit replacement and saving time.
• Superior durability: Cobalt-enhanced M35 steel boosts heat and wear resistance, lasting 2 – 3 times longer than ordinary HSS bits, even for stainless steel and titanium alloys.
• Precise drilling: Fully ground 135° split point enables self-centering, avoiding slipping; the two-step structure ensures smooth hole transition without burrs.
• Efficient chip removal: Optimized spiral flutes clear debris rapidly, reducing friction and heat buildup during multi-step drilling.