Guhring 9006590042000 Stub Drill Bit 0.1654 in Cobalt

Product Description

The GUHRING 9006590042000 is a stub-length (screw machine length) twist drill bit built for demanding metal-cutting applications. It carries a 4.20 mm (0.1654 inch) diameter, an M35 cobalt steel construction, and a titanium nitride (TiN) tip coating. The 130-degree split point and web-thinned geometry reduce thrust force at entry and improve centering without a center punch. This bit is sized for production drilling environments where a shorter flute column provides rigidity and reduced deflection in CNC machining centers, drill presses, and hand-fed power tools.

Designed primarily for titanium alloy workpieces, this bit also performs in stainless steel, high-strength alloys, and other difficult-to-machine materials. The stub length format keeps the flute column short at 0.8661 inches, which stiffens the tool against walking and chatter in close-tolerance hole work. Machinists, toolroom technicians, and maintenance mechanics working in aerospace, medical device, and precision fabrication environments will find this bit well-suited for repeat-hole drilling cycles where tool life and hole quality matter.

Key Features

• M35 cobalt steel body withstands elevated cutting temperatures in hard and exotic alloys
• TiN tip coating reduces friction at the cutting edge and extends tool life between regrinds
• 130-degree split point with web thinning improves self-centering and lowers entry thrust
• Stub (screw machine) length keeps flute column at 0.8661 inches for maximum rigidity
• Straight-cylindrical shank fits standard drill chucks without adapters
• Tapered web and regular spiral flute configuration promotes chip evacuation in blind holes

Compatibility

Designed as an OEM-specification stub-length drill bit conforming to DIN 1897 standards, fitting standard straight-shank drill chucks accepting a 4.20 mm shank diameter.

Installation Notes

Installation and use should be performed by a qualified machinist or maintenance technician familiar with cutting tool setup. Ensure the drill chuck is clean and fully seated before tightening to prevent shank slip. Power down or de-energize the machine spindle completely before changing or inspecting the bit. When drilling titanium or high-strength alloys, use appropriate cutting fluid and do not exceed the recommended feed and speed range for cobalt tooling to avoid work hardening the workpiece surface.