Hertel 74130881 Cobalt Screw Machine Drill Bit Size 36

Product Description

The HERTEL 74130881 is a cobalt screw machine length drill bit designed for high-speed drilling in tough materials including alloy steels, stainless steel, and hardened workpieces. Built to wire gauge size 36, it measures 0.1065 inches in diameter with an overall length of 1-13/16 inches. The 135-degree split point reduces walking and cutting thrust, making it well suited for production drilling on lathes, drill presses, and CNC equipment. Right-hand cutting with a regular spiral flute pattern, this bit is part of the HSCO135 series and features a web-thinned parallel web configuration for improved chip evacuation and hole entry performance.

Screw machine length drill bits are shorter than jobber-length bits, giving them greater rigidity and reduced deflection in close-tolerance drilling applications. This bit is commonly used in metalworking shops, machine shops, and fabrication environments where precise, repeatable hole sizing is required. The cobalt construction retains hardness at elevated cutting temperatures, extending tool life when machining abrasive or heat-resistant alloys without coolant-through capability. A straw finish indicates heat treatment consistent with cobalt high-speed steel tooling.

Key Features

• Wire gauge size 36 with 0.1065-inch decimal diameter for precise hole sizing
• 135-degree split point reduces thrust and eliminates center-punch marking on most metals
• Cobalt high-speed steel (HSCO) construction maintains hardness under high cutting temperatures
• Web-thinned parallel web improves chip flow and reduces feed force
• Screw machine length body provides added rigidity and minimized deflection
• Straight cylindrical shank fits standard drill chucks and collets without modification

Compatibility

Designed as a direct-fit screw machine length drill bit for standard drill chucks and collets accepting straight cylindrical shanks in the 0.1000 to 0.1500 inch diameter range.

Installation Notes

Installation and use of this bit should be performed by qualified machinists or metalworking professionals familiar with drill press, lathe, or CNC spindle setup. Secure the shank fully in the chuck or collet before beginning any cut, and verify spindle speed is appropriate for the workpiece material and bit diameter. Do not exceed the rated cutting parameters for the tool material. Inspect the cutting edges before each use and replace the bit if chipping or dulling is observed to maintain hole quality and operator safety.