RUKO KEB-HSSCo-Mod.55-25.0mm HSS-Co Twist Drill Bit, 25 mm, DIN 338, Split Point

Drilling large-diameter holes in tough materials like stainless steel or alloyed steel demands a bit that stays sharp and true. The RUKO KEB-HSSCo-Mod.55-25.0mm twist drill bit answers that need with a cobalt-alloyed high-speed steel body, precision-ground flutes, and a split point that starts on contact without wandering.

Who is it for

Machinists, metal fabricators, and serious DIYers who regularly work with hard-to-machine steels, cast iron, and non-ferrous metals. It fits hand drills, pillar drills, and automatic machines with a standard cylindrical shank.

Main features

• HSS-Co (5% cobalt) construction for high heat resistance and extended tool life
• 25.0 mm diameter with h8 tolerance for accurate holes
• 135° split point (Kreuzanschliff) reduces walking and requires less feed pressure
• Bright finish and ground-from-solid manufacturing for consistent quality
• DIN 338 geometry with right-hand cutting direction

Specifications

• Material: HSS-Co (High-Speed Steel Cobalt)
• Drill bit type: Twist drill bit
• Diameter: 25.0 mm
• Overall length: 250 mm
• Working length: 150 mm
• Shank type: Cylindrical
• Point angle: 135°
• Tip type: Split point
• Cobalt content: 5%
• Cutting direction: Right-hand
• Surface finish: Bright
• Tolerance: h8
• Standard: DIN 338
• Series: Mod. 55

Tips

Use a cutting fluid or coolant when drilling stainless or alloy steels to maximize bit life. For deep holes, retract periodically to clear chips. The split point works best with a center punch mark for precise positioning.