Guhring 9005490060400 Jobber Drill Bit Letter B Hss

Product Description

The GUHRING 9005490060400 is a jobber length twist drill bit sized to Letter B (0.2378 inches) and built from high speed steel with a bright, uncoated finish. It features a 130-degree split point angle and a parabolic flute geometry that promotes efficient chip evacuation and reduced thrust during drilling. The straight-cylindrical shank measures 0.2378 inches in diameter, and the bit carries an overall length of 3-31/32 inches with a flute length of 2-15/32 inches. Manufactured to DIN 338 standards, this is a high-performance drill bit suited for professional metalworking, maintenance, and fabrication applications where consistent accuracy and clean entry are required.

This drill bit is optimized for use in aluminum and other non-ferrous and short-chipping materials, corresponding to material codes K, N, and P. Its parabolic flute profile at a 5xD flute-to-diameter ratio supports deeper drilling passes with effective chip clearance. The maximum drilling depth reaches 2.1240 inches (53.94 mm), making it appropriate for through-holes and moderate-depth blind holes in production and job-shop environments. Machinists, tool-and-die tradespeople, and maintenance technicians will find it well suited for drill press, CNC, and hand-held power tool applications.

Key Features

• Letter B size — 0.2378 inches diameter, manufactured to DIN 338 specification
• 130-degree standard point angle with web thinning for reduced entry force
• Parabolic flute geometry at 5xD ratio promotes chip evacuation in aluminum and similar materials
• Bright uncoated high speed steel construction — suitable for regrinding and general-purpose use
• Straight-cylindrical shank for compatibility with standard drill chucks
• Right-hand cutting direction; 2-flute configuration

Compatibility

Designed as a DIN 338 jobber length drill bit for use in standard drill chucks and collet systems accepting a 0.2378-inch straight-cylindrical shank, suitable for drill presses, CNC machining centers, and hand-held power tools.

Installation Notes

This bit is installed by a machinist or qualified trades technician into a properly rated drill chuck or collet system. Verify chuck capacity and runout before use, and ensure the workpiece is securely clamped or fixtured prior to drilling. Use appropriate cutting fluid or coolant when drilling ferrous materials or when extended production runs are anticipated. Follow all applicable shop safety protocols and machine-guarding requirements during operation.