Guhring 9005520042500 Stub Drill Bit 0.1673in Hss

Product Description

The GUHRING 9005520042500 is a screw machine (stub) length drill bit designed for high-performance drilling in aluminum and similarly machinable materials. Built to DIN 1897 standards from high speed steel with a bright, uncoated finish, this bit features a parabolic flute geometry and a web-thinned, parallel web configuration that improves chip evacuation and reduces cutting resistance. The 130-degree split point and right-hand cut make it well-suited for production drilling where hole quality and cycle time both matter. This is a single-unit tool intended for use in CNC machining centers, drill presses, and screw machine setups.

The stub length format keeps the bit rigid and reduces deflection in short-reach applications, making it a common choice for production environments where repeatability is critical. The 4.25 mm (0.1673 inch) diameter fills a precise metric size requirement frequently encountered in aerospace, automotive, and general machining work. Parabolic flute design promotes efficient chip removal without pecking in most aluminum drilling scenarios, supporting 3xD depth capacity in a single pass under appropriate feed and speed conditions.

Key Features

• DIN 1897 stub length format for maximum rigidity and minimal deflection
• Parabolic flute geometry with web thinning for fast, clean chip evacuation
• 130-degree point angle optimized for aluminum and non-ferrous materials
• Bright, uncoated high speed steel construction for general-purpose use
• Straight-cylindrical shank fits standard drill chucks and collet holders
• Diameter tolerance of +0.000 to -0.018 mm for consistent, repeatable hole sizing

Compatibility

Designed as an OEM-compatible replacement or direct-use drill bit for applications requiring a 4.25 mm stub length drill conforming to DIN 1897, within the 3.50 mm to 5.00 mm diameter range. Primary workpiece material is aluminum; suitability for other materials depends on feed, speed, and coolant conditions.

Installation Notes

Installation and use should be performed by a qualified machinist or tool operator familiar with proper chuck or collet mounting procedures. Ensure the shank is fully seated and the holding device is torqued or tightened per the machine manufacturer's specification before operation. Confirm spindle direction is set to right-hand rotation before engaging the workpiece. This bit does not support coolant-through delivery; external or flood coolant should be used where chip heat is a concern.