Guhring 9006220086100 Cobalt Drill Bit Letter R 0.339 in

Product Description

The GUHRING 9006220086100 is a cobalt jobber length drill bit in Letter R size (0.3390 inches diameter), built for high-performance drilling in a range of workpiece materials. It features a 130-degree drill point angle and a parabolic flute design that improves chip evacuation and reduces heat buildup during extended cuts. The bright, uncoated finish is standard for cobalt-grade tooling where coating compatibility with the workpiece material is a consideration. With an overall length of 4-29/32 inches and a flute length of 3-3/16 inches, it fits standard drill chucks via its straight-cylindrical shank. This bit conforms to DIN 338 specifications and is intended for professional machining and fabrication applications.

This drill bit is rated primarily for aluminum and similar non-ferrous and general-purpose materials, covering material codes K, N, and P. It suits jobber-length drilling tasks in CNC machining centers, drill presses, and hand-held industrial drill applications where parabolic flute geometry provides improved chip flow over standard twist flute designs. The 5xD flute-to-diameter ratio and web-thinned, tapered web configuration support cleaner entry and reduced thrust force. It is sold individually (package quantity of 1) and is appropriate for machine shops, metalworking contractors, and maintenance trades requiring precision-ground cobalt tooling.

Key Features

• Letter R size: 0.3390 inches diameter with a diameter tolerance of -0.022 to 0.000 mm
• 130-degree standard point angle suited for general-purpose and aluminum drilling
• Parabolic flute geometry with 5xD flute-to-diameter ratio for efficient chip evacuation
• Web-thinned, tapered web construction reduces entry thrust and improves centering
• Straight-cylindrical shank (0.3390 inches) compatible with standard drill chucks and collets
• Conforms to DIN 338 specification; cobalt high-performance grade, bright uncoated finish

Compatibility

Designed as a DIN 338-compliant jobber length drill bit in GUHRING Series 622, suitable for use in drill presses, CNC machining centers, and industrial hand drills accepting a straight-cylindrical shank. Primary workpiece material compatibility covers aluminum and similar non-ferrous and general-purpose materials (material classification codes K, N, and P).

Installation Notes

Installation should be performed by a qualified machinist or metalworking professional familiar with proper toolholder torque and runout requirements. Ensure the drilling machine is fully powered down and any workpiece is securely clamped before bit installation or removal. Confirm chuck or collet size matches the 0.3390-inch shank diameter before use. Do not exceed the maximum drilling depth of 2.6810 inches without retracting to clear chips.