Hertel 04138491 Cobalt Jobber Drill Bit No 2 Wire

Product Description

The HERTEL 04138491 is a cobalt jobber-length drill bit in No. 2 wire size (0.2210 inches decimal equivalent) designed for heavy-duty holemaking in ferrous and hard metals. The 135-degree split point reduces walking and allows drilling to start without a center punch in many applications. An oxide and TiN coating improves surface hardness and extends tool life under high-heat conditions. The right-hand spiral flute configuration evacuates chips efficiently during through-hole operations. This bit is sold individually and is appropriate for use in production shops, maintenance facilities, and trade service environments where precise hole sizing in tough materials is required.

This jobber drill is suited for holemaking in steel, stainless, cast iron, and similar hard or abrasive materials. The heavy-duty cobalt construction makes it a practical choice when high-speed steel bits wear prematurely. Typical install scenarios include fabrication shops, HVAC sheet-metal work, plumbing rough-in drilling, and electrical panel work where consistent hole diameter and bit longevity in hard stock are priorities. The straight-cylindrical shank fits standard three-jaw drill chucks without adapters.

Key Features

• No. 2 wire size with 0.2210 inch decimal diameter for precise hole sizing
• 135-degree split point reduces thrust and minimizes bit walk on entry
• Cobalt construction with oxide and TiN coating for extended tool life in hard and abrasive materials
• Right-hand spiral flute with regular spiral type for efficient chip evacuation
• Web-thinned tapered web reduces cutting resistance and heat buildup
• Straight-cylindrical shank fits standard drill chucks without modification

Compatibility

Designed as a standard jobber-length drill bit for use in any three-jaw chuck or compatible drill press, hand drill, or CNC spindle accepting a 0.2210 inch straight-cylindrical shank within the 0.2000 to 0.2500 inch drill bit size range.

Installation Notes

Install and remove drill bits only with the drill fully powered down and the chuck key removed from the chuck. Secure the workpiece firmly before drilling to prevent rotation or movement. Use appropriate cutting fluid or coolant on hard ferrous materials to extend bit life, even though this bit does not support internal coolant-through delivery. Inspect the cutting edges for wear or chipping before each use and replace the bit when the split point or margins show visible degradation.