RUKO SPB-DIN338-HSSCo8-Ø7,8mm HSS-Co 8% kobolttikierrepora DIN 338 ristihionta 135°

Twist drill bit with 8% cobalt high-speed steel for demanding metal drilling tasks. The split point design ensures precise centering and reduces thrust force, while the fully ground flutes provide excellent chip removal and high heat resistance.

Advantages

Made from HSS-Co 8% (high-speed steel with 8% cobalt), this drill bit offers very high heat resistance and is suitable for materials up to 1100 N/mm² tensile strength. The 135° split point allows for accurate starting without a center punch and minimizes walking. Fully ground flutes ensure smooth chip evacuation and longer tool life.

Suitable for

• High-alloy steels
• Stainless steels
• Acid-resistant steels
• Heat-resistant steels
• Bronze
• Cast iron
• Grey cast iron
• Spheroidal graphite cast iron
• Malleable cast iron
• Sintered iron
• Nickel silver
• Graphite
• Aluminium alloys (short-chipping)
• Brass (short-chipping)

Key specifications

• Material: HSS-Co 8% (High-Speed Steel with 8% Cobalt)
• Standard: DIN 338
• Diameter: 7.8 mm
• Overall Length (L1): 117 mm
• Working Length (L2): 75 mm
• Point Angle: 135°
• Point Type: Split Point (Cross-ground)
• Manufacturing Process: Fully Ground
• Shank Type: Cylindrical
• Flute Type: Standard Spiral (Type N)
• Cutting Direction: Right-hand
• Tolerance: h8
• Surface Finish: Bright / Uncoated

Recommendations

Ideal for professional use in workshops and manufacturing where precision and durability are required. Use with appropriate cutting fluid for best results on tough materials.