Hertel 42164 Cobalt Jobber Drill Bit 7/16 in 135 Deg

Product Description

The HERTEL 42164 is a cobalt jobber-length drill bit designed for high-performance drilling in tough materials. Built from M35 cobalt steel, this bit handles stainless steel, cast iron, high-nickel alloys, and other hard ferrous metals that standard HSS bits struggle with. The 135-degree split point reduces thrust force and starts on contact without center-punching. At 5.5 inches overall length with a 4.063-inch spiral flute, it follows standard jobber proportions that fit most drill chucks and right-angle attachments. The bright uncoated finish allows direct inspection of the flute condition after each use. Machinists, maintenance mechanics, and metal fabricators reach for this size and grade when material hardness demands cobalt geometry.

The HERTEL 42164 is suited for general-purpose metalworking in shop, field, and maintenance environments. The 7/16-inch diameter is a common production and repair size used in structural steel fabrication, HVAC sheet-metal work, plumbing rough-in for pipe hanger anchors, and electrical panel knockouts. The straight cylindrical shank seats in standard three-jaw chucks on drill presses, hand drills, and magnetic base drills. Right-hand cutting direction is compatible with all conventional drill press and handheld drill operation. The regular spiral type and 5xD flute-to-diameter ratio provide reliable chip evacuation without packing in interrupted cuts.

Key Features

• M35 cobalt steel construction for drilling hard and abrasive metals
• 135-degree split point starts on contact and reduces walking without a center punch
• Bright uncoated finish for easy flute and edge inspection
• Two-flute regular spiral design promotes consistent chip evacuation
• Straight cylindrical shank fits standard three-jaw drill chucks
• Right-hand cutting direction compatible with conventional drill equipment

Compatibility

Designed as a standard jobber-length drill bit with a straight cylindrical shank, compatible with any three-jaw chuck rated for 7/16-inch shank diameters on drill presses, handheld drills, and magnetic base drills.

Installation Notes

Secure the shank fully in the chuck and verify concentricity before drilling. Use appropriate cutting fluid or coolant when drilling stainless steel or high-nickel alloys to extend edge life. Apply steady, consistent feed pressure — excessive force accelerates edge breakdown in cobalt-grade bits. Wear appropriate eye protection and secure the workpiece per shop safety standards.