Hertel 04138475 Cobalt Jobber Drill Bit 1/2 Inch

Product Description

The HERTEL 04138475 is a cobalt jobber-length drill bit designed for demanding holemaking in hard and abrasive materials. The 1/2-inch diameter bit features a 135-degree split point for self-centering starts with reduced walking, eliminating the need for a center punch on most surfaces. An oxide and TiN coating provides added surface hardness and heat resistance. With a 6-inch overall length and 4.5-inch flute length, the bit suits a standard jobber reach in metalworking, maintenance, and industrial fabrication applications. It is sized for use in drill presses, hand drills, and milling machine setups. Installed by machinists, maintenance mechanics, and trade professionals requiring a heavy-duty drill bit for tough substrates.

This drill bit is built for holemaking in alloy steels, stainless steel, cast iron, titanium alloys, and other hard materials where standard high-speed steel bits wear prematurely. The straight-cylindrical shank fits standard 3-jaw drill chucks. The regular spiral flute geometry promotes chip evacuation in deep-hole drilling. Web thinning reduces thrust requirements at the cutting edge, making full-diameter penetration more efficient. Suitable for production and maintenance shop environments where bit longevity and cutting performance in tough materials are the primary concerns.

Key Features

• Cobalt construction with oxide and TiN coating for extended tool life in hard materials
• 135-degree split point reduces walking and lowers thrust force at drill start
• Web-thinned, tapered web configuration for improved penetration efficiency
• Right-hand cutting direction with regular spiral flute for consistent chip evacuation
• Straight-cylindrical shank fits standard drill chucks without adapters
• Heavy-duty grade rated for holemaking in high-strength and abrasive workpiece materials

Compatibility

Designed as a jobber-series replacement drill bit for use in standard 3-jaw drill chucks accepting a 1/2-inch straight-cylindrical shank. Compatible with drill presses, hand drills, and milling machines configured for that shank size.

Installation Notes

Installation and use should be performed by machinists or qualified trade professionals familiar with rotating cutting tools. Ensure the drill chuck is fully secured and the workpiece is firmly clamped before starting. Always wear appropriate eye protection and follow shop safety protocols when operating drill equipment. Do not exceed the recommended speed and feed rates for the workpiece material being drilled.