Hertel 53383857 Screw Machine Drill Bit Size 7 Cobalt

Product Description

The HERTEL 53383857 is a screw machine length drill bit designed for high-speed, short-reach drilling applications where rigidity and accuracy matter. Built from cobalt steel with an oxide coating, this bit handles harder workpiece materials that would quickly wear down standard high-speed steel tooling. The 135-degree split-point geometry reduces walking at entry and lowers the thrust force needed to initiate a cut. At 1.25 inches overall length with a 0.5625-inch flute length, this stub-length format is well suited to drill press and CNC operations requiring a stiff setup with minimal deflection.

This drill bit is sized to wire gauge Number 7, with a decimal diameter of 0.2010 inches. Screw machine length bits are commonly used in production machining, metal fabrication shops, and maintenance environments where standard jobber-length bits flex too much or where the work envelope is tight. The spiral flute geometry at a 3xD ratio promotes chip evacuation without sacrificing core strength. Machinists, tool-and-die tradespeople, and CNC operators are the typical end users for this style of bit.

Key Features

• Cobalt steel construction resists heat buildup during drilling in alloy steels, stainless, and cast iron
• Oxide coating provides additional surface hardness and mild lubricity
• 135-degree split point reduces entry walking and decreases required feed pressure
• Stub screw machine length at 1.25 inches overall increases rigidity and reduces deflection
• Regular spiral flute at 3xD ratio supports efficient chip clearance in short-hole applications
• 0.2010-inch decimal diameter matches wire gauge Number 7 for precision fit requirements

Compatibility

Designed as a screw machine length replacement drill bit for standard drill chucks and collet holders accepting a Number 7 wire gauge shank in metalworking and production machining applications.

Installation Notes

Installation of this bit is performed by machinists or metalworking tradespeople using a drill press, turret lathe, or CNC machining center. Secure the shank fully in the chuck or collet before operation and verify runout is within acceptable tolerance for the application. Always wear appropriate eye protection and secure the workpiece before drilling. Do not use this bit in wood-dedicated or masonry setups where the geometry and material are mismatched.