Hertel 42039 Cobalt Jobber Drill Bit 17/32 in 135 Degree

Product Description

The HERTEL 42039 is a cobalt jobber length drill bit sized at 17/32 inches (0.5313 inches decimal) with a 135-degree split point. The cobalt construction with oxide and gold coating provides heat resistance and wear durability suited for drilling into hardened steel, stainless steel, cast iron, and other tough materials. The split point geometry reduces walking at the start of the cut, eliminating the need for a center punch in most applications. With an overall length of 6-5/8 inches and a 4-13/16-inch spiral flute, this bit handles the depth range typical of standard jobber drilling tasks. It is installed and used by machinists, pipefitters, ironworkers, and maintenance mechanics.

This bit is a standard jobber length format, making it compatible with most benchtop drill presses, magnetic drills, and handheld drilling equipment using straight-cylindrical shank tooling. It is appropriate for production drilling, maintenance and repair work, and fabrication applications where a general-purpose cobalt bit is specified. Right-hand cutting direction means it runs with standard forward-rotation drill chucks. The 5xD flute-to-diameter ratio supports chip evacuation in deeper holes without requiring parabolic flute geometry.

Key Features

• Cobalt material with oxide and gold coating for heat and wear resistance in hard metals
• 135-degree split point reduces thrust force and eliminates center-punch requirement on flat stock
• Straight-cylindrical shank fits standard drill press and handheld drill chucks
• Two-flute regular spiral design promotes efficient chip evacuation
• Right-hand cutting direction compatible with all standard rotation drilling equipment
• 6-5/8-inch overall length with 4-13/16-inch flute length covers typical jobber-depth applications

Compatibility

Designed as a jobber length drill bit with a straight-cylindrical shank, this bit fits standard three-jaw drill chucks on benchtop drill presses, floor-standing drill presses, and handheld power drills sized for the 17/32-inch shank diameter range.

Installation Notes

A licensed machinist or qualified maintenance mechanic should confirm proper chuck engagement and secure clamping before operation. Always power down and de-energize the drilling equipment before changing bits. Use appropriate cutting fluid or coolant for the workpiece material to extend bit life, even though this bit does not feature coolant-through design. Follow applicable OSHA machine guarding and PPE requirements when operating drilling equipment.