Guhring 9017020085000 Carbide Drill Bit 8.5 Mm

Product Description

The GUHRING 9017020085000 is a screw machine length (stub length) drill bit designed for high-performance drilling in demanding shop and industrial applications. Built from solid carbide DK460UF grade material and finished with a TiN (titanium nitride) coating, this bit delivers extended tool life and reliable hole quality in ferrous and non-ferrous materials. The 8.5 mm diameter corresponds to 0.3346 decimal inches. It features a 140-degree split-point (SF) tip geometry that reduces thrust and improves self-centering on entry. Overall length is 79 mm (3.11 inches) with a 37 mm (1.46 inches) flute length, making it suited for short-reach drilling applications where rigidity is critical.

This bit is intended for use in CNC machining centers, drill presses, and manual machine tools where a stub-length carbide drill is specified. The straight-cylindrical shank seats directly in standard ER collet chucks, Weldon holders, or drill chucks sized for 8.5 mm shanks. It is well suited for production drilling in tool rooms, job shops, and manufacturing environments. The 3xD flute-to-diameter ratio provides chip clearance for moderate-depth holes. Installers and machinists in metal fabrication, automotive, and industrial maintenance applications are the primary users.

Key Features

• Solid carbide DK460UF grade construction for rigidity and wear resistance
• TiN coating on cutting edges and drill tip extends tool life and reduces friction
• 140-degree SF split-point geometry reduces entry thrust and improves self-centering
• Straight-cylindrical shank compatible with standard collet chucks and drill chucks
• Tapered web configuration with regular spiral flutes for consistent chip evacuation
• Manufactured to DIN 6539 specification for dimensional consistency

Compatibility

Designed as an OEM-style screw machine length drill bit for use in machine tool setups requiring an 8.5 mm straight-shank carbide drill conforming to DIN 6539. Compatible with tool holders accepting a 0.3346 inch (8.5 mm) straight-cylindrical shank.

Installation Notes

Installation is performed by qualified machinists or tool-room technicians. Ensure the machine spindle is fully stopped and locked out before inserting or removing the bit from the holder. Seat the shank fully and evenly in the collet or chuck and verify runout before beginning a drilling operation. Solid carbide tooling is brittle — avoid side loads, interrupted cuts without proper feed rate adjustment, and contact with hard inclusions that exceed the tool rating.