Guhring 9005520035000 Stub Drill Bit 3.50mm Hss

Product Description

The GUHRING 9005520035000 is a screw machine length (stub) drill bit designed for high-speed steel applications requiring accurate, repeatable hole entry in tight setups. Built to DIN 1897 standards, this bit measures 3.50 mm (0.1378 inches) in diameter with an overall length of 52.00 mm (2.0472 inches) and a parabolic flute length of 20.00 mm (0.7874 inches). The 130-degree point angle and web-thinned geometry promote fast chip evacuation and reduce thrust force on entry. It is intended for use by machinists, tool-and-die technicians, and precision fabricators working in production environments where stub-length rigidity is required.

This drill bit is optimized for aluminum as the primary workpiece material, making it a practical choice for aluminum machining operations in job shop, production floor, and CNC drilling setups. Its parabolic flute design supports efficient chip removal at higher feed rates typical in screw machine and short-run drilling work. The straight-cylindrical shank fits standard drill chucks without modification. Maximum recommended drilling depth is 0.5810 inches (14.75 mm), and the flute-to-diameter ratio is 3xD, consistent with stub-length performance in close-tolerance applications.

Key Features

• DIN 1897 stub-length geometry provides enhanced rigidity and reduced deflection during drilling
• 130-degree point angle with web-thinned tip reduces entry thrust and improves hole positioning accuracy
• Parabolic flute design promotes chip evacuation at elevated feed rates, particularly in aluminum
• Bright/uncoated high speed steel finish suitable for non-ferrous and aluminum workpieces
• Right-hand cut, straight-cylindrical shank compatible with standard drill chucks and collets
• Parallel web configuration with 3xD flute-to-diameter ratio balances chip clearance with core strength

Compatibility

Designed as an OEM-style replacement or direct fitment for applications requiring a DIN 1897 stub-length drill bit with a 3.50 mm diameter straight-cylindrical shank. Confirmed primary workpiece material is aluminum per manufacturer specification.

Installation Notes

This bit is installed by machinists and precision drilling technicians using standard drill chucks, collets, or CNC tool holders. Ensure the machine spindle is fully de-energized and locked out before changing tooling. Secure the shank fully within the chuck or collet to the recommended grip depth before operation. Do not exceed the maximum drilling depth of 0.5810 inches (14.75 mm) per the 3xD flute ratio to avoid chip packing and bit breakage.