Hertel 42274 Cobalt Jobber Drill 5mm 135 Degree Split Point

Product Description

The HERTEL 42274 is a cobalt jobber-length drill bit ground to a 135-degree split point for fast, self-centering starts on tough materials. Built to M35 grade cobalt high-speed steel, it delivers the heat resistance and edge retention needed when drilling stainless steel, hardened alloys, and other abrasion-resistant workpiece materials. The bit measures 5.00 mm (0.1969 inches) in diameter with an overall length of 86.00 mm (3.39 inches) and a flute length of 52.00 mm (2.05 inches). The oxide finish adds surface protection without sacrificing sharpness at the cutting edge. This is a heavy-duty grade bit intended for production and maintenance machining environments.

This drill bit is suited for metalworking applications where standard high-speed steel tooling falls short. Primary workpiece materials include stainless steel and hardened metals — applications common in industrial maintenance, fabrication shops, aerospace MRO, and mechanical contracting work. The straight cylindrical shank accepts standard drill chucks in bench drills, drill presses, and CNC drilling operations. The regular spiral flute geometry promotes efficient chip evacuation in deep-hole drilling within its 5xD flute-to-diameter ratio rating.

Key Features

• M35 cobalt HSS construction for superior heat and wear resistance over standard HSS bits
• 135-degree split point reduces thrust force and eliminates the need for a center punch on most metals
• Right-hand cutting, regular spiral flute for reliable chip clearance
• Oxide surface finish provides corrosion resistance and reduces galling during cutting
• Straight cylindrical shank fits standard drill chucks without adapters
• Heavy-duty grade rating — appropriate for stainless steel and hardened material applications

Compatibility

Designed as an OEM-style replacement or direct tooling option for standard jobber drill applications requiring a 5.00 mm diameter cobalt bit with a straight shank; compatible with any drill press, hand drill, or CNC drilling unit accepting straight-shank tooling in the 5.00 mm to 6.00 mm drill bit size range.

Installation Notes

Installation and use of this drill bit should be performed by a qualified machinist or tradesperson familiar with metalworking practices. Secure the straight shank fully within the chuck and verify runout before beginning a cut. Power down and de-energize any machine spindle before changing tooling. Coolant-through is not supported by this bit; use appropriate cutting fluid applied externally when drilling stainless steel or hardened materials to extend tool life and prevent work hardening.