Guhring 9003050005000 Cobalt Drill Bit 0.5 Mm Series 305

Product Description

The GUHRING 9003050005000 is a cobalt jobber length drill bit designed for precision drilling in demanding ferrous materials. Built to DIN 338 standards, it features a 0.5 mm diameter, a 118-degree cone relief point, and a bright uncoated finish. The two-flute spiral design with a regular flute type promotes efficient chip evacuation during operation. Web thinning reduces thrust requirements at entry, making this bit suitable for controlled drilling applications where small-diameter precision is critical. Licensed HVAC technicians, machinists, and trade professionals working with steel and cast iron reach for cobalt-grade tooling when high-speed steel alone is not sufficient.

This drill bit is suited for general-purpose drilling in cast iron and steel workpieces across light industrial and trade service environments. With a 5xD flute-to-diameter ratio, it is optimized for shallow-to-moderate depth holes in typical bench-top and handheld drilling scenarios. The straight-cylindrical shank fits standard drill chucks without modification, making it a straightforward replacement in Series 305 applications. Its compact overall length of 22 mm makes it practical in tight-access drilling situations common in field service work.

Key Features

• Cobalt construction for improved hardness and heat resistance in ferrous materials
• 118-degree cone relief point with web thinning for reduced entry thrust
• DIN 338 standard jobber length format for broad chuck compatibility
• Two-flute regular spiral design for efficient chip removal
• Straight-cylindrical shank with h8 diameter tolerance for accurate chuck seating
• Bright uncoated finish — no coating buildup to affect dimensional accuracy

Compatibility

Designed as an OEM-style replacement fitting GUHRING Series 305 tooling specifications per DIN 338. Primary workpiece materials are cast iron and steel (material codes K and P).

Installation Notes

Installation and use should be performed by qualified machinists or trade professionals familiar with small-diameter drill bit handling. Secure the straight-cylindrical shank fully in a properly sized drill chuck before operation. At 0.5 mm diameter, feed rate and spindle speed must be carefully controlled to prevent bit breakage — consult published speed-and-feed tables for cobalt tooling in the target material. Coolant-through is not supported on this bit; use external cutting fluid as appropriate for the workpiece material.