Hertel 42109 Cobalt Jobber Drill Bit 14mm 135 Split Point

Product Description

The HERTEL 42109 is a cobalt jobber length drill bit designed for drilling through hard and abrasive materials including stainless steel, high-alloy steels, and tough workpiece materials that would rapidly wear standard HSS tooling. Built to M35 cobalt grade, this bit features a 135-degree split point that reduces walking on entry without a center punch and a gold oxide coating that improves surface hardness and heat resistance. The straight cylindrical shank seats in standard drill chucks without adapters. At 14 mm (0.5512 inches) in diameter and 6.30 inches overall length, it suits both handheld and drill press applications in metal fabrication, mechanical, and maintenance trade work.

This drill bit is suited for professional use in machine shops, MRO maintenance environments, and on-site metal work where cobalt-grade tooling is required. The 135-degree split point geometry and right-hand spiral flute with regular helix handle chip evacuation in ferrous materials. It is sized within the 12.50 to 15.00 mm range and fits standard drill press chucks and handheld drills with compatible chuck capacity. Machinists, millwrights, pipefitters, and maintenance mechanics commonly carry cobalt jobber bits for interrupted cuts and hard-material applications.

Key Features

• M35 cobalt steel construction for enhanced heat and wear resistance in hard materials
• 135-degree split point reduces drill walking and entry force without center punching
• Gold oxide coating improves surface hardness and extends tool life
• Right-hand spiral flute with regular helix for consistent chip evacuation
• Straight cylindrical shank fits standard drill chucks without adapters
• 2-flute design, 4.25-inch flute length for deep-hole clearance in jobber-length applications

Compatibility

Designed as a jobber-length drill bit in the 12.50 to 15.00 mm size range, compatible with any standard drill press or handheld drill chuck rated for straight cylindrical shanks at 14 mm diameter.

Installation Notes

A licensed machinist or qualified tradesperson should confirm chuck capacity and spindle speed before use. Secure the workpiece and verify the chuck is fully tightened before beginning the cut. Use appropriate cutting fluid or coolant for ferrous metals to maintain bit temperature and extend tool life. Follow applicable shop safety standards and wear eye protection during all drilling operations.