Guhring 9005150111100 7/16 in Stub Drill Bit

Product Description

The GUHRING 9005150111100 is a screw machine length (stub) drill bit designed for high-production drilling in cast iron and steel. Built from powdered metal (PMASP60 grade) with a coated finish, this bit features a parabolic flute geometry and web-thinned point that work together to improve chip evacuation and reduce thrust in short-hole applications. The 130-degree point angle is suited for harder ferrous materials. Overall length is 3.74 inches with a straight-cylindrical shank diameter of 0.4375 inches, making it compatible with standard drill chucks and toolholders used in machining and fabrication environments. This bit is installed by machinists, tool-and-die professionals, and metalworking tradespeople.

This stub-length drill bit is used in screw machine work, CNC drilling operations, and manual drilling where stub rigidity reduces deflection. Primary workpiece materials are cast iron and steel. The 7/16 inch diameter falls within the 0.4000 to 0.4500 inch size range of the Series 515 lineup. Its 3xD flute-to-diameter ratio and parabolic flute design help manage chips at moderate feed rates without coolant-through capability, making it practical for dry or flood-coolant setups on conventional machine tools.

Key Features

• Powdered metal construction (PMASP60) for wear resistance in ferrous materials
• Parabolic flute design improves chip flow and reduces packing in blind holes
• Web-thinned point lowers entry thrust and improves centering
• 130-degree point angle optimized for cast iron and steel
• Stub length provides added rigidity and reduced deflection vs. jobber length
• Meets DIN 1897 specification for consistent dimensional tolerances

Compatibility

Designed as an OEM-style replacement or direct-use stub drill bit for machining applications involving cast iron and steel workpieces. Part of GUHRING Series 515, covering the 0.4000 to 0.4500 inch diameter range per DIN 1897.

Installation Notes

This bit is installed by machinists and metalworking professionals in drill presses, lathes, or CNC machining centers. Secure the straight-cylindrical shank fully in the chuck or collet before operation to prevent slippage under load. Confirm spindle speed and feed rate are appropriate for the workpiece material and diameter before drilling. No coolant-through path is present, so external coolant or cutting fluid should be applied at the point of contact when required by the application.