RUKO SPB-DIN338 8.8mm HSS-Co Twist Drill Bit

Drilling into high-alloy steels, stainless steels, and heat-resistant materials demands a drill bit that stays sharp and resists wear. The RUKO SPB-DIN338 8.8mm HSS-Co twist drill bit meets that challenge with a cobalt-alloyed high-speed steel body and a precision-ground split point for accurate starts and clean holes.

Who is it for

Professional machinists and demanding DIYers who work with tough metals, including stainless steel, acid-resistant steel, cast iron, and bronze. This bit is ideal for applications where standard HSS bits dull quickly or overheat.

Main features

• 8.8 mm diameter with DIN 338 standard dimensions
• HSS-Co (5% cobalt) for high heat resistance and durability
• 135° split point for self-centering and reduced walking
• Fully ground flutes for smooth chip evacuation
• Cylindrical shank fits standard drill chucks

Specifications

• Drill Bit Type: Twist Drill Bit
• Standard: DIN 338
• Material: HSS-Co (High-Speed Steel with Cobalt)
• Cobalt Content: 5%
• Diameter: 8.8 mm
• Total Length: 125 mm
• Working Length: 87 mm
• Shank Type: Cylindrical
• Point Angle: 135°
• Point Grind: Split Point (Cross-Ground)
• Surface Finish: Bright
• Tolerance: h8
• Cutting Direction: Right-hand cutting
• Manufacturing Process: Fully Ground
• Recommended Application: High-alloy steels, stainless steels, acid and heat-resistant steels, cast iron, bronze
• Suitable for Materials: Steel, Cast Iron, Non-ferrous Metals, Plastics
• Tensile Strength (max): Up to 1100 N/mm²
• Packaging Quantity: 1 piece

Tips

Use cutting fluid or coolant when drilling stainless or high-alloy steels to extend bit life. For best results, drill at a lower speed and apply steady pressure to avoid work hardening.