Guhring 9003050040400 Cobalt Jobber Drill Bit No. 21

Product Description

The GUHRING 9003050040400 is a cobalt jobber length drill bit designed for general-purpose drilling in ferrous materials. Built to DIN 338 standards, it carries a No. 21 wire gauge size corresponding to 0.1591 inches in diameter. The 118-degree standard point angle suits a wide range of workpiece materials, and the oxide coating provides surface hardness and heat resistance during cutting. The two-flute spiral design promotes chip evacuation, while the web-thinned, tapered web reduces thrust force at the tip. This bit is a reliable choice for licensed machinists, maintenance mechanics, and skilled tradespeople working with steel and cast iron.

This drill bit is suited for drilling cast iron and steel in production and maintenance environments. The straight-cylindrical shank fits standard three-jaw drill chucks and collet holders commonly found on drill presses, lathes, and hand-held power drills. With an overall length of 75 mm and a flute length of 43 mm, this bit is appropriate for shallow-to-moderate depth holes up to approximately 1.454 inches deep. The regular spiral type and 5xD flute-by-diameter ratio support consistent chip removal at typical feed and speed rates for the listed workpiece materials.

Key Features

• No. 21 wire gauge size, 0.1591 inches in diameter, to DIN 338 specification
• Cobalt construction with oxide coating for heat resistance and extended tool life in ferrous materials
• 118-degree standard point angle with web-thinned, tapered web for reduced entry thrust
• Two-flute regular spiral design promotes chip evacuation in steel and cast iron
• Straight-cylindrical shank fits standard drill chucks and collet holders
• Right-hand cut with maximum drilling depth of 1.454 inches (36.94 mm)

Compatibility

Designed for drilling cast iron and steel workpieces as indicated by material codes K and P per DIN 338 classification. This bit fits any standard drill chuck or collet accepting a 0.1591-inch straight-cylindrical shank.

Installation Notes

Installation and use of this drill bit should be performed by qualified machinists or tradespeople familiar with cutting tool safety. Secure the shank fully in the chuck or collet and confirm runout before drilling. Always power down and de-energize the machine before changing tooling. Follow applicable workplace safety standards and manufacturer speed-and-feed guidelines for cobalt tooling in ferrous materials.