RUKO SPB-DIN338-7,7mm-HSSCo kierrepora

The RUKO SPB-DIN338-7,7mm-HSSCo is a precision twist drill bit engineered for demanding metalworking tasks. Its 5% cobalt high-speed steel construction delivers superior heat resistance and durability, making it ideal for drilling stainless steel, alloyed steel, and cast iron where standard HSS bits fail.

Highlights

• DIN 338 standard with 7.7 mm diameter and 117 mm overall length
• 135° split point for accurate self-centering and reduced walking
• Fully ground from solid HSS-Co for excellent concentricity and chip evacuation
• Bright / steam tempered finish for enhanced wear resistance

In daily use

This bit excels in general-purpose drilling across a range of materials, from unalloyed steel to plastics. The split point geometry minimizes thrust pressure, while the cylindrical shank ensures secure clamping in keyless or keyed chucks. With a working length of 75 mm, it reaches deep holes without sacrificing rigidity.

Full specifications

• Drill bit type: Twist drill bit
• Standard: DIN 338
• Material: HSS-Co (5% cobalt)
• Diameter: 7.7 mm
• Overall length: 117 mm
• Working length: 75 mm
• Shank type: Cylindrical
• Shank diameter: 7.7 mm
• Point angle: 135°
• Point grind: Split point (cross-ground)
• Surface finish: Bright / steam tempered
• Manufacturing process: Fully ground
• Direction of cut: Right-hand
• Tolerance: h8
• Recommended materials: Steel (alloyed/unalloyed), stainless steel, cast iron, non-ferrous metals, plastics

Final note

A reliable choice for workshops and professionals requiring consistent performance in tough drilling applications.