Hertel 74131459 Screw Machine Drill Bit 3/16 in Cobalt

Product Description

The HERTEL 74131459 is a screw machine length drill bit designed for high-production drilling applications where stub-length rigidity and cutting performance are required. Built from cobalt tool steel and finished with a TiAlN coating, this bit handles harder workpiece materials and elevated cutting temperatures better than standard HSS tooling. The 135-degree split point reduces thrust and enables self-centering without a center punch. At 2.1875 inches overall length with a 1.125-inch flute, the compact geometry limits deflection and suits tight-clearance drilling in CNC machining centers, drill presses, and hand-held power tools used by machinists, pipefitters, and HVAC fabricators.

This bit is sized at 0.1875 inches (3/16 inch) diameter and falls within the 0.1500 to 0.2000 inch drill bit size range. It is suited for drilling ferrous and non-ferrous metals, stainless steel, cast iron, and other hard materials encountered in mechanical, HVAC, plumbing, and electrical trade fabrication work. The straight-cylindrical shank fits standard three-jaw chucks. Right-hand spiral flute geometry evacuates chips efficiently in standard clockwise-rotation drilling operations.

Key Features

• Cobalt tool steel construction for increased heat and wear resistance over standard HSS bits
• TiAlN coating extends tool life and reduces friction at the cutting interface
• 135-degree split point with web thinning reduces entry thrust and improves self-centering
• Screw machine (stub) length minimizes deflection in high-feed drilling setups
• Right-hand spiral flute with parallel web configuration for consistent chip evacuation
• Straight-cylindrical shank compatible with standard drill chucks

Compatibility

Designed as an OEM-style screw machine length drill bit for use in standard three-jaw drill chucks accepting a straight-cylindrical shank at 3/16 inch diameter.

Installation Notes

Installation and use should be performed by qualified machinists or trade professionals familiar with rotating cutting tool safety. Secure the shank fully in the chuck and verify runout before beginning a drilling operation. Use appropriate cutting fluid or lubrication when drilling ferrous metals to preserve coating life and prevent work hardening. Follow applicable shop safety standards and machine-tool manufacturer guidelines for speed and feed selection.