Guhring 9055200038600 Cobalt Stub Drill Bit No. 24

Product Description

The GUHRING 9055200038600 is a cobalt screw machine (stub) length drill bit in wire gauge size No. 24, producing a 0.152-inch diameter hole. Built to DIN 1897 specification, it features a 118-degree four-facet split point with web thinning for fast penetration and reduced thrust. The straight-cylindrical shank seats securely in standard drill chucks and collets. With a 2-flute right-hand spiral and an overall length of 2.165 inches (55 mm), this stub-length design provides added rigidity over jobber-length bits, making it well suited for precision drilling in close-tolerance applications. It is intended for installation by machinists, tool-and-die technicians, and maintenance trades requiring consistent, repeatable hole quality.

This drill bit is optimized for aluminum as its primary workpiece material but the cobalt construction and four-facet point geometry also support use in softer steels and other non-ferrous metals. The stub length format — with a flute length of 22 mm and a maximum drilling depth of 0.638 inches (16.21 mm) — is a standard choice for CNC machining centers, drill presses, and hand-held operations where bit deflection must be minimized. The 3xD flute-to-diameter ratio supports efficient chip evacuation in shallow-to-moderate depth holes.

Key Features

• Wire gauge No. 24 — 0.152-inch (3.86 mm) diameter with tolerance of +0.000 to -0.018 mm
• 118-degree four-facet split point with web thinning for reduced entry thrust and self-centering action
• Cobalt tool material for heat resistance and extended tool life in aluminum and softer metals
• Stub length per DIN 1897 — 55 mm overall length provides superior rigidity over standard jobber bits
• Straight-cylindrical shank (3.86 mm) compatible with standard chucks and ER collets
• Right-hand cut, regular spiral, tapered web configuration for consistent chip flow

Compatibility

Designed as a DIN 1897 stub-length replacement drill bit for use in any drill chuck or collet system accepting a 0.152-inch straight-cylindrical shank. Suitable for CNC machining centers, manual drill presses, and portable drilling equipment configured for wire gauge tooling.

Installation Notes

Installation and tool changes should be performed with the machine at a full stop and all energy sources isolated per standard lockout/tagout procedures. Ensure the chuck or collet is clean and undamaged before seating the shank to maintain runout within tolerance. Do not exceed the rated maximum drilling depth of 0.638 inches per pass without retracting to clear chips. Coolant-through is not supported on this bit; use external flood or mist coolant as required by the workpiece material.