Guhring 9005150090900 Stub Drill Bit 0.3579 in

Product Description

The GUHRING 9005150090900 is a stub-length (screw machine length) twist drill bit engineered for high-efficiency drilling in cast iron and steel. Built from powdered metal with a coated finish, it features a parabolic flute geometry and a 130-degree point angle that promotes fast chip evacuation and reduced thrust force in short-hole applications. The straight-cylindrical shank fits standard drill chucks, and the web-thinned tip eases entry into workpieces. This bit is sized at 0.3579 inches (Letter Size T) in diameter and is a practical choice for machinists, tool-and-die technicians, and maintenance professionals working in production or job-shop environments.

This drill bit is designed for use in ferrous materials, with primary workpiece suitability in cast iron and steel. The stub-length body provides added rigidity compared to jobber-length bits, making it well suited for drill press work, CNC machining centers, and manual machine tool operations where chatter and deflection control are priorities. The parabolic flute with a 3xD flute-to-diameter ratio supports chip clearing at moderate to high feed rates. Coolant-through capability is not available on this model.

Key Features

• 0.3579 inch (Letter T) diameter with h8 tolerance for consistent, repeatable hole sizing
• 130-degree cone relief point angle reduces cutting force and improves self-centering on entry
• Parabolic fast-spiral flute design accelerates chip evacuation in deep-hole passes
• Web-thinned tip lowers thrust requirements and extends tool life in ferrous materials
• Powdered metal construction with coating provides wear resistance beyond standard HSS
• Stub-length body increases rigidity and minimizes deflection in short-hole drilling
• Manufactured to DIN 1897 standard, Series 515

Compatibility

Designed for drilling cast iron and steel workpieces. Straight-cylindrical shank is compatible with standard drill chucks and collet systems accepting 0.3579 inch shanks. Sized within the 0.3500 to 0.4000 inch drill bit diameter range per DIN specification.

Installation Notes

Installation and use should be performed by qualified machinists or tool technicians familiar with drill press, lathe, or CNC machine tool operation. Ensure the machine spindle is fully stopped and locked out before mounting or removing the bit from the chuck or collet. Verify chuck jaw capacity accommodates the straight-cylindrical shank before tightening. Always run within the tool manufacturer's recommended speed and feed range for the specific workpiece material to avoid premature wear or tool breakage.