RUKO SPB-DIN338-5.4mm-HSSCo Twist Drill Bit

Precision drilling in tough materials demands a bit that stays sharp, centers accurately, and withstands heat. The RUKO SPB-DIN338-5.4mm-HSSCo twist drill bit is engineered for exactly that: a fully ground HSS-Co bit with 5% cobalt, a 135° split point, and DIN 338 geometry for reliable performance in alloyed steel, stainless steel, cast iron, non-ferrous metals, and plastics.

Who is it for

Professional machinists, metalworkers, and demanding DIYers who need a durable, accurate drill bit for production or repair work. If you frequently drill stainless steel or hardened alloys, this cobalt bit delivers the heat resistance and edge retention that standard HSS bits lack.

Main features

• 5% cobalt HSS-Co for high heat resistance and long life
• 135° split point for fast, accurate starting without walking
• Fully ground flutes for smooth chip evacuation and precise hole size
• DIN 338 standard dimensions: 93 mm overall length, 57 mm working length
• Type N flute with right-hand cutting for general-purpose use
• Bright finish for clean, friction-reducing performance

Specifications

• Diameter: 5.4 mm
• Overall length: 93 mm
• Working length: 57 mm
• Material: HSS-Co (5% cobalt)
• Point angle: 135°
• Point type: Split point (cross-ground)
• Flute type: Type N (normal helix)
• Shank type: Cylindrical
• Cutting direction: Right-hand
• Manufacturing process: Fully ground
• Surface finish: Bright
• Tolerance: h8
• Standard: DIN 338

Tips

Use appropriate cutting speed and feed for the material; for stainless steel, reduce speed and use cutting fluid to maximize bit life. Ensure the workpiece is securely clamped. The split point reduces the need for center punching, but for critical holes, a center punch can still improve accuracy.