Hertel 41985 Cobalt Jobber Drill Bit 15/64 in 135 Deg

Product Description

The HERTEL 41985 is a cobalt jobber-length drill bit designed for high-speed drilling in tough materials including hardened steels, stainless steel, cast iron, and heat-resistant alloys. Built from cobalt steel with an oxide and gold coating, it resists heat buildup and wear during extended use. The 135-degree split point reduces walking on entry and lowers thrust force needed to start the cut. At 3.875 inches overall length with a 2.625-inch flute length, this is a standard jobber-length bit suited for general-purpose hole-making in metal fabrication, maintenance, and mechanical work. Licensed tradespeople and machinists working with ferrous metals reach for cobalt bits when high-speed steel falls short.

This drill bit fits applications where material hardness or heat generation exceeds what standard HSS bits handle reliably. Common uses include drilling into stainless steel fasteners, structural steel, hardened fastener plates, and similar ferrous workpieces. The straight cylindrical shank seats in standard 3-jaw drill chucks on both handheld and bench-mounted drilling equipment. The regular spiral flute geometry provides efficient chip evacuation in through-hole and blind-hole drilling setups across HVAC, plumbing, electrical, and general mechanical trade work.

Key Features

• Cobalt steel construction with oxide and gold coating for extended tool life in hard materials
• 135-degree split point reduces walking and lowers entry thrust compared to conventional 118-degree points
• Right-hand cutting direction with regular spiral flute for standard clockwise drill operation
• 2-flute spiral design promotes chip evacuation in both through-hole and blind-hole applications
• Straight cylindrical shank fits standard 3-jaw chucks without requiring adapters
• Jobber-length geometry balances reach and rigidity for general-purpose metal drilling

Compatibility

Designed as an OEM-style replacement or direct-use jobber-length drill bit for any standard 3-jaw drill chuck accepting straight cylindrical shanks in the 0.2000 to 0.2500 inch diameter range.

Installation Notes

Installation of this bit requires a drill press, handheld power drill, or similar drilling equipment with a 3-jaw chuck. Ensure the workpiece is securely clamped before drilling to prevent movement during cutting. Use appropriate cutting fluid or coolant when drilling ferrous metals to extend bit life and prevent heat-related work hardening of the material. Inspect the cutting edges before use and replace the bit if chipping or excessive wear is observed.