Guhring 9006100084000 Screw Machine Drill Bit 8.40mm Cobalt

Product Description

The GUHRING 9006100084000 is a screw machine length cobalt drill bit designed for high-performance drilling in tough materials. Manufactured to DIN specification in the Series 610 lineup, this bit features an 8.40 mm diameter, a 135-degree split point with cone relief geometry, and a web-thinned tip that reduces thrust and improves self-centering on entry. The M35 cobalt construction handles heat buildup better than standard HSS, making it suitable for stainless steel, hardened alloys, and other abrasion-resistant workpieces. The bright uncoated finish with a straw appearance is typical of high-quality cobalt tooling. Machinists and tool-and-die professionals rely on this format for short, rigid setups where precision hole location is critical.

Screw machine length drill bits are the shortest standard length category, giving them greater rigidity and reduced runout compared to jobber or taper length bits. This makes the 9006100084000 well suited for CNC machining centers, turret lathes, screw machines, and manual drill press work where hole tolerances are tight. The h8 diameter tolerance ensures consistent fit through toolholders and bushings. The 3xD flute-to-diameter ratio and regular spiral flute geometry provide reliable chip evacuation in through-hole and shallow-cavity drilling applications across ferrous and non-ferrous materials.

Key Features

• M35 cobalt steel construction for heat resistance in stainless steel and hard alloy drilling
• 135-degree split point with cone relief and web thinning for reduced entry thrust and self-centering
• h8 diameter tolerance for precise fit in drill bushings and collet-style toolholders
• Screw machine length body provides maximum rigidity and minimal deflection
• Regular spiral flute geometry supports efficient chip evacuation in general-purpose drilling
• DIN specification compliance ensures dimensional interchangeability with standard tooling

Compatibility

Designed as a general-purpose screw machine length drill bit within the GUHRING Series 610 family, suitable for use in any standard straight-shank toolholder, drill chuck, or drill bushing sized for an 8.40 mm shank diameter.

Installation Notes

Installation is performed by machinists and toolroom technicians. Secure the straight shank fully in a properly sized collet, chuck, or drill bushing before operation and verify runout with a dial indicator where tolerances are critical. Ensure the spindle and workpiece are fully stopped before tool changes. Do not exceed the recommended cutting speeds and feeds for the workpiece material, and apply cutting fluid as appropriate when drilling stainless steel or hardened alloys to extend tool life.