DEWALT HSS-E Cobalt Twist Drill Bit 6.8 mm, 10-Piece Bulk Pack, DIN 338, 135° Split Point

Professional-grade HSS-E cobalt twist drill bit with 6.8 mm diameter, engineered for heavy-duty drilling in stainless steel, acid-resistant steel, heat-resistant steel, cast iron, bronze, hardened plastics, and other high-tensile strength materials. The 5% cobalt alloy (M35) delivers exceptional heat resistance and wear resistance, maintaining hardness even at elevated temperatures. Precision ground with a 135° split point for fast, accurate starts without center punching and reduced walking. Straight shank, right-hand cut, spiral flute design ensures efficient chip evacuation. DIN 338 standard dimensions: 109 mm overall length, 69 mm flute length, h8 shank tolerance. Supplied in a bulk pack of 10 bits for workshop and industrial use.

Advantages

High cobalt content (5%) provides superior hot hardness and durability, allowing higher cutting speeds and longer tool life compared to standard HSS bits. The 135° split point self-centers, eliminating the need for pilot holes and reducing thrust pressure. Precision ground flutes produce clean, accurate holes with excellent surface finish. Bright finish reduces friction and resists corrosion. Suitable for use in stationary drills and hand-held drills with adequate power.

Suitable for

• Stainless steel and acid-resistant steel
• Heat-resistant steel and high-tensile strength materials
• Cast iron and bronze
• Hardened plastics
• Industrial maintenance, metal fabrication, and automotive work

Key specifications

• Diameter: 6.8 mm
• Overall length: 109 mm
• Flute length: 69 mm
• Shank: Straight, h8 tolerance
• Point: 135° split point
• Material: HSS-E with 5% cobalt (M35)
• Standard: DIN 338
• Pack quantity: 10 pieces

Recommendations

For best results, use cutting fluid or appropriate lubrication when drilling stainless and heat-resistant steels. Reduce speed compared to mild steel and apply steady, firm pressure. Ensure the workpiece is securely clamped. These bits are ideal for production environments where consistent performance and long life are critical.