Guhring 9006590065300 Cobalt Stub Drill Bit 0.2571in

Product Description

The GUHRING 9006590065300 is a cobalt stub-length (screw machine length) drill bit designed for demanding metal-cutting applications. Built to DIN 1897 standards, this right-hand-cut bit features a 130-degree split point, a parabolic flute geometry, and a web-thinned tip that reduces thrust and improves chip evacuation in tough materials. At 0.2571 inches (Letter F) in diameter, it carries a diameter tolerance of +0.000 to -0.022 mm, making it a heavy-duty tool suited for precision hole production. Licensed HVAC, mechanical, and industrial maintenance trades reach for cobalt-grade stub drills when working through hardened steel, stainless, or titanium alloy components.

This bit is rated by the manufacturer for primary use in titanium alloy workpieces, where heat buildup and work hardening are constant concerns. The stub-length body limits deflection in short-reach setups such as drill presses and CNC machining centers. The parabolic flute design moves chips out of the cut efficiently, reducing re-cutting and heat at the tip. A straight-cylindrical shank fits standard drill chucks and collets without modification. Maximum drilling depth is 0.835 inches (21.21 mm), consistent with a 3xD flute-to-diameter ratio. Overall tool length is approximately 2.76 inches (70.00 mm), with a flute length of approximately 1.22 inches (31.00 mm).

Key Features

• Cobalt tool material provides heat resistance for cutting titanium alloy and other difficult metals
• 130-degree split point with web thinning reduces entry thrust and improves centering
• Parabolic flute geometry accelerates chip removal and reduces heat buildup
• Stub length minimizes deflection in tight or short-reach drilling setups
• DIN 1897 specification with parallel web configuration for consistent geometry
• Straight-cylindrical shank fits standard drill chucks and ER collets without modification

Compatibility

Designed as an OEM-specification stub drill per DIN 1897 in the Letter F (0.2571-inch) size range, suitable for use in any drill press, machining center, or handheld drill driver accepting a straight-cylindrical shank in the 0.2500 to 0.3000-inch diameter range.

Installation Notes

This drill bit is intended for use by machinists and maintenance technicians on metalworking equipment. Secure the shank fully in the chuck or collet before operation and verify runout before drilling. When cutting titanium alloy or hardened steel, use appropriate cutting fluid to manage heat and extend tool life. Inspect the cutting edges and web before each use and replace the bit if chipping or excessive wear is observed.