Hertel 42147 Cobalt Jobber Drill Bit 1/4 Inch 135 Deg

Product Description

The HERTEL 42147 is a cobalt jobber length drill bit designed for high-performance drilling in tough materials including stainless steel, hardened alloys, and heat-resistant metals. Built from M35 cobalt steel with a bright uncoated finish, this bit runs a 135-degree split point that reduces walking and cuts through work material with less pressure than a standard 118-degree point. The 1/4-inch diameter and 4-inch overall length place it in the standard jobber range, making it a go-to choice for general-purpose and maintenance drilling in trade and industrial settings. Two spiral flutes evacuate chips cleanly during operation.

This drill bit is well suited for HVAC, plumbing, electrical, and mechanical contractors who regularly drill through harder base metals and structural components. The right-hand cutting direction and straight cylindrical shank allow it to seat in standard drill chucks and drill presses without adapters. The 2-3/4-inch flute length provides adequate chip clearance in deeper holes for common trade applications. It is sold individually and is appropriate for both bench-mounted drill press work and portable hand-drill use on the job site.

Key Features

• M35 cobalt steel construction for heat resistance and durability in hard materials
• 135-degree split point reduces drill walking and lowers required feed pressure
• Bright uncoated finish compatible with cutting fluids and standard coolants
• Right-hand spiral flute design with regular spiral type for efficient chip evacuation
• Straight cylindrical shank fits standard 3-jaw drill chucks without modification
• 2-3/4-inch flute length on a 4-inch overall length for balanced reach and rigidity

Compatibility

Designed as a standard jobber-length drill bit with a straight cylindrical shank, compatible with any drill chuck or drill press accepting 1/4-inch round-shank bits.

Installation Notes

Install and remove this bit only with the drill unplugged or the battery removed. Secure the shank fully in the chuck and tighten all jaws evenly before drilling. Apply cutting fluid when drilling stainless or hardened steel to extend bit life and manage heat. Use appropriate PPE including safety glasses and secure workpiece clamping per standard shop practice.