Hertel 42280 Cobalt Jobber Drill 7.00 Mm 135 Deg

Product Description

The HERTEL 42280 is a cobalt jobber-length drill bit engineered for demanding metal-cutting applications. Built from M35 cobalt high-speed steel, it delivers the heat resistance and edge retention needed when drilling stainless steel, hardened materials, and other tough alloys. The 135-degree split point reduces walking and allows the bit to bite into hard surfaces without a center punch. Overall length is 4.29 inches (109.00 mm) with a flute length of 2.72 inches (69.00 mm). The straight cylindrical shank fits standard drill chucks, and the right-hand spiral flute clears chips efficiently during through-hole operations. This is a heavy-duty grade bit sold as a single unit.

The HERTEL 42280 is suited for machining shops, maintenance technicians, and fabricators working with stainless steel, tool steel, and hardened workpiece materials. The 7.00 mm diameter (0.2756 inches decimal equivalent) falls within the 0.2500 to 0.3000 inch size range commonly used for fastener clearance, tapped hole prep, and precision drilling in metalworking. The oxide finish provides baseline corrosion protection during storage and use. This bit is appropriate for use in drill presses, CNC machining centers, and handheld drill drivers with adequate torque.

Key Features

• M35 cobalt HSS construction for heat resistance in hard and abrasive materials
• 135-degree split point reduces thrust and eliminates center-punch requirement on hard stock
• 7.00 mm diameter with 5xD flute-to-diameter ratio for efficient chip evacuation
• Right-hand cutting, regular spiral flute, straight cylindrical shank for standard chuck compatibility
• Heavy-duty grade rating suitable for stainless steel and hardened material applications
• Oxide finish provides surface protection without additional coating thickness

Compatibility

Designed as a jobber-length replacement drill bit for use on stainless steel and hardened materials, fitting any standard drill chuck that accepts a straight cylindrical shank in the 7.00 mm diameter range.

Installation Notes

Cobalt drill bits should be run at lower surface speeds than standard HSS bits when drilling stainless steel to prevent work hardening at the cut face. Use a cutting fluid or coolant rated for stainless steel to extend tool life and maintain hole quality. Secure the workpiece firmly before drilling to prevent movement that can chip the split point. This bit does not support coolant-through operation.