Guhring 9003290037500 Cobalt Stub Drill Bit 3.75 Mm

Product Description

The GUHRING 9003290037500 is a cobalt stub-length (screw machine length) drill bit designed for demanding metalworking applications where a standard-length bit would flex or chatter. Built to DIN 1897 specifications, it measures 3.75 mm (0.1476 inches) in diameter with a 130-degree split point and a web-thinned, tapered web configuration that reduces thrust and improves centering at entry. The M35 cobalt steel construction paired with an oxide finish makes this bit well-suited for cutting titanium alloys and other high-strength materials. Machinists, tool-and-die techs, and precision fabricators working on CNC screw machines, drill presses, and manual lathes reach for this series when material hardness and chip load demand more than standard high-speed steel.

The Series 329 stub-length design is intended for close-tolerance drilling in production environments where short overhang and rigidity matter. Its 20.00 mm (0.787 inches) flute length limits cutting depth, making it appropriate for through-holes and shallow blind holes in titanium alloy, stainless, and other hard metals. The straight cylindrical shank seats directly in standard collets, drill chucks, and quick-change tooling systems without adapters. Right-hand cut, regular spiral flutes provide consistent chip evacuation suited to the short-flute geometry.

Key Features

• M35 cobalt steel construction for heat resistance in hard-metal drilling
• 130-degree point angle with web thinning reduces entry thrust and improves self-centering
• Oxide-coated drill tip extends tool life on titanium alloy and tough alloys
• DIN 1897 stub-length geometry increases rigidity and minimizes deflection
• Straight cylindrical shank fits standard collets and drill chucks without adapters
• Diameter tolerance of +0.000 to -0.018 mm for close-tolerance hole production

Compatibility

Designed as a DIN 1897 stub-length replacement drill bit suitable for use in standard drill chucks, collets, and quick-change tooling systems that accept a 3.75 mm straight cylindrical shank. Primary workpiece material per manufacturer specification is titanium alloy; also applicable to similarly hard ferrous and non-ferrous metals consistent with M35 cobalt tooling.

Installation Notes

Installation and use should be performed by qualified machinists familiar with drill press, CNC, or manual lathe operation. Ensure the spindle is fully stopped and the machine is locked out before changing tooling. Seat the shank fully and evenly in the chuck or collet and verify runout before cutting. Do not exceed the maximum drilling depth of 20.00 mm (0.787 inches) in a single pass without retracting to clear chips.