Hertel 42108 Cobalt Jobber Drill Bit 13.5mm 135 Deg

Product Description

The HERTEL 42108 is a cobalt jobber-length drill bit designed for drilling through tough ferrous and non-ferrous metals in industrial and trade applications. Manufactured from M35 cobalt steel and finished with an oxide and gold coating, it handles heat and wear better than standard high-speed steel bits. The bit measures 13.5 mm (0.5315 inches) in diameter with a 135-degree split point that reduces walking on entry and requires less thrust to start a hole. Overall length is 160 mm (6.30 inches) with a flute length of 108 mm (4.25 inches). The straight cylindrical shank seats securely in standard drill chucks. It is a right-hand cutting, two-flute design with a regular spiral suited to a wide range of metal drilling tasks performed by machinists, maintenance techs, and mechanical tradespeople.

This bit is suited for production drilling and maintenance repair operations where work materials include mild steel, stainless steel, cast iron, and high-temperature alloys. The 5xD flute-to-diameter ratio provides sufficient chip clearance during deeper passes. It fits applications where a jobber-length bit is the standard reach requirement without the deflection risk of extended-length tooling. The oxide and gold coating helps reduce friction and extend cutting life across repeated use cycles.

Key Features

• M35 cobalt steel construction for improved heat and wear resistance over standard HSS
• 135-degree split point reduces bit walking and lowers required entry thrust
• Oxide and gold coating minimizes friction and extends tool life
• Two-flute regular spiral design promotes efficient chip evacuation
• Straight cylindrical shank fits standard drill chucks without adapters
• Right-hand cutting direction compatible with conventional drill press and handheld drill operation

Compatibility

Designed as a jobber-length drill bit for use in standard drill chucks accepting straight cylindrical shanks, suitable for drill presses, CNC drilling operations, and handheld power drills within the 12.50 mm to 15.00 mm (0.5000 to 0.6500 inch) drill bit size range.

Installation Notes

Installation and use should be performed by qualified machinists or mechanical tradespeople familiar with proper drilling speeds and feeds for cobalt tooling. Secure the shank fully in the chuck before operation and confirm the workpiece is clamped or fixtured to prevent movement. Use appropriate cutting fluid for the work material to extend tool life and improve hole quality. Inspect the cutting edges before each use and replace the bit if chipping or excessive wear is present.