Hertel 42042 Cobalt Jobber Drill Bit 35/64 in 135 Deg

Product Description

The HERTEL 42042 is a cobalt jobber-length drill bit designed for high-speed drilling in hard and abrasive materials. Built from cobalt steel with an oxide and gold coating, this bit resists heat buildup and extends tool life compared to standard HSS alternatives. The 135-degree split point reduces walking on entry and requires less downside pressure to start a hole without a center punch. At 6.625 inches overall length with a 4.8125-inch flute length, the 42042 handles standard jobber-depth applications across a wide range of metalworking tasks. It is suited for machinists, maintenance technicians, and metalworking tradespeople working in production or field environments.

This drill bit is sized at 35/64 inch (0.5469 inch decimal) and is intended for drilling operations in stainless steel, hardened steel, cast iron, titanium alloys, and other tough materials that quickly degrade standard HSS bits. The right-hand spiral flute and straight cylindrical shank make it compatible with standard drill chucks and milling setups. The regular spiral type and 5xD flute-to-diameter ratio make it appropriate for general-purpose jobber-depth through-holes in both manual and CNC-assisted operations.

Key Features

• Cobalt steel construction with oxide and gold coating for heat resistance and extended service life
• 135-degree split point reduces bit walking and lowers required entry force
• Right-hand cut with a 2-flute regular spiral for efficient chip evacuation
• Straight cylindrical shank fits standard 3-jaw drill chucks without adapters
• 4.8125-inch flute length supports full jobber-depth drilling applications
• No coolant-through design for use in conventional drilling setups

Compatibility

Designed as a general-purpose jobber-length drill bit for use with standard drill chucks accepting straight cylindrical shanks in the 0.5000 to 0.6500 inch diameter range.

Installation Notes

Installation of this bit is performed by machining and maintenance trades using standard drill press, hand drill, or CNC equipment. Secure the shank fully in the chuck before operation and verify runout before drilling in precision applications. Use appropriate cutting fluid or coolant for extended drilling runs in hardened or stainless materials to preserve coating and edge life. Inspect the cutting edge for wear or chipping after use in abrasive materials and replace when point geometry degrades.