Hertel 74131194 Cobalt Screw Machine Drill Bit Letter H

Product Description

The HERTEL 74131194 is a cobalt screw machine length drill bit sized at Letter H (17/64 inch, 0.2660 inch decimal), designed for drilling in tough ferrous and stainless materials where heat resistance matters. The 135-degree split point reduces walking and requires no center punch on most surfaces. At 2-11/16 inches overall length with a 1-1/2 inch flute length, this is a stub-length bit optimized for rigidity and reduced deflection in production or maintenance drilling. The straw finish is a byproduct of the cobalt heat treatment process, not a separate coating. Two regular spiral flutes with web thinning clear chips efficiently in short-hole applications.

This bit is suited for metalworking applications in maintenance, repair, and production environments where screw machine length bits are preferred for their inherent stiffness. Typical use cases include drilling pilot holes, clearance holes, and through-holes in steel, stainless, and other hard alloys. The straight shank fits standard drill chucks on drill presses, hand drills, and CNC turret setups. It performs well in environments where standard HSS bits dull prematurely due to heat buildup or abrasive workpiece material.

Key Features

• Cobalt construction for heat resistance in hard and abrasive metals
• 135-degree split point reduces thrust and eliminates walking without a center punch
• Web-thinned, parallel web configuration for improved chip flow and reduced torque
• Stub screw machine length (2-11/16 inches OAL) provides greater rigidity than jobber-length bits
• Right-hand cutting with regular spiral flutes for standard drill setups
• Straight-cylindrical shank fits standard drill chucks without adapters

Compatibility

Designed as an OEM-style replacement or direct-use bit for any standard drill chuck accepting a straight-shank bit in the screw machine length format, suitable for drill presses, hand drills, and CNC turret drill heads.

Installation Notes

Installation is performed by machinists, maintenance technicians, or metalworking tradespeople. Secure the straight shank fully in the drill chuck and tighten with a chuck key before operation. Use appropriate cutting fluid or coolant for the workpiece material to extend bit life, even though coolant-through is not available on this bit. Inspect the split point for chipping or wear before each use and replace if the cutting edges are compromised.