Guhring 9005150107200 Stub Drill Bit 27/64 in Powdered Metal

Product Description

The GUHRING 9005150107200 is a screw machine length (stub) drill bit designed for high-productivity drilling in cast iron and steel. Built from powdered metal (PMASP60 grade) with a coated finish, it delivers extended tool life compared to standard HSS tooling. The bit features a parabolic flute geometry that promotes efficient chip evacuation, and a 130-degree drill point angle suited for harder ferrous materials. Web thinning reduces entry force and improves centering accuracy. At 0.42 inches (27/64 inch) in diameter, this bit fits standard drill chucks and CNC toolholders with a straight-cylindrical shank. It is intended for machinists, tool-room operators, and production floor technicians.

This stub-length drill bit is built for applications where rigidity matters more than reach, including short-hole drilling on machining centers, drill presses, and screw machines. Its compact flute length reduces deflection in interrupted cuts and tight setups. Primary workpiece materials are cast iron and steel. The 3xD flute-to-diameter ratio and parabolic flute form support faster feed rates in production environments. The bit conforms to DIN 1897 specifications, making it a direct fit for metric and imperial mixed-tolerance setups common in precision machining shops.

Key Features

• 27/64 inch (0.4200 inch) diameter with a tight tolerance of +0.000 to -0.027 mm
• 130-degree cone relief point angle optimized for cast iron and steel drilling
• Parabolic flute design promotes fast chip evacuation and reduced heat buildup
• Web-thinned, parallel web configuration reduces thrust force at entry
• Powdered metal PMASP60 construction with coated finish for extended wear resistance
• Conforms to DIN 1897 stub drill standard for consistent dimensional accuracy

Compatibility

Designed as an OEM-style stub drill conforming to DIN 1897, compatible with standard straight-shank drill chucks and collet systems used on drill presses, CNC machining centers, and screw machines. Suitable for drilling cast iron and steel workpieces.

Installation Notes

Installation and tool changes should be performed by a qualified machinist or toolroom technician with the machine fully powered down and all spindle motion stopped. Secure the straight-cylindrical shank fully within the chuck or collet before tightening to manufacturer-recommended holding specifications. Inspect the cutting edges and coating condition before each use; a chipped or worn edge on a stub drill can cause workpiece damage or sudden tool failure. Always observe applicable shop safety standards and machine tool operating procedures when setting feeds and speeds for the target material.