Hertel 42187 Cobalt Screw Machine Drill Bit 13/64 in

Product Description

The HERTEL 42187 is a cobalt screw machine length drill bit designed for drilling into tough materials including hardened steels, heat-treatable alloy steels, stainless steel, and titanium alloy. It measures 13/64 inch (0.2031 inches) in diameter with an overall length of 2.25 inches and a flute length of 1.1875 inches. The 135-degree split point reduces walking and cutting pressure at entry. The oxide straw finish provides light lubricity and corrosion resistance during cutting operations. This bit is used by machinists, tool-and-die technicians, and maintenance mechanics who regularly work with ferrous and exotic alloy materials.

Screw machine length drill bits are shorter than jobber-length bits, which makes them more rigid and better suited for close-tolerance drilling in confined spaces, drill presses, CNC machining centers, and turret lathes. The HERTEL 42187 fits applications where shorter flute-to-diameter ratios reduce deflection and improve hole accuracy. Its 3xD flute-by-diameter ratio keeps chip evacuation efficient in the materials it is rated for. This bit is well-suited for production environments and maintenance shops that regularly encounter stainless steel or hardened workpieces where standard HSS tooling wears too quickly.

Key Features

• M35 cobalt steel construction for extended tool life in hardened and stainless materials
• 135-degree split point for self-centering entry and reduced thrust force
• Oxide straw finish for light lubricity and basic corrosion resistance
• Screw machine length body reduces deflection in tight-clearance setups
• Regular spiral flute geometry supports consistent chip removal
• No coolant-through design keeps cost low for general-purpose production use

Compatibility

Designed for use in standard drill chucks, drill presses, CNC machining centers, and turret lathes accepting 13/64 inch round shank tooling. Rated for hardened materials, heat-treatable alloyed steels, stainless steel, and titanium alloy workpieces.

Installation Notes

Installation and use should be performed by a qualified machinist or tooling technician familiar with cutting speeds and feeds for cobalt tooling. Secure the workpiece firmly and verify chuck runout before drilling. Use appropriate cutting fluid for stainless steel and titanium alloy applications to reduce heat buildup. Inspect the split point for damage before each use, as a chipped point will affect entry accuracy and tool life.