Hertel 89321723 Screw Machine Drill Bit Wire 31 Hss

Product Description

The HERTEL 89321723 is a screw machine length drill bit designed for general-purpose drilling in metal, wood, and plastic. Shorter than a jobber-length bit, the screw machine body provides increased rigidity and reduced deflection, making it well suited for drilling in tight spaces or on CNC machines, drill presses, and turret lathes. This bit is sized to wire gauge No. 31, which corresponds to 0.1200 inch decimal equivalent. It is ground with a 118-degree conventional point angle and runs right-hand cutting. The high-speed steel construction handles standard shop drilling without coating. Overall length is 1-7/8 inches with a 7/8 inch flute length.

This drill bit is used in machine shop, production, and maintenance environments where small-diameter, close-tolerance holes are required. The screw machine length format is common on automatic screw machines, CNC lathes, and bench drill presses where stub-length tooling reduces chatter and improves hole location accuracy. It is appropriate for drilling ferrous and non-ferrous materials at moderate speeds and feeds. Machinists, tool-and-die workers, maintenance technicians, and production operators are the typical end users.

Key Features

• Wire gauge No. 31 size — 0.1200 inch decimal equivalent for precise small-diameter hole making
• Screw machine (stub) length body increases rigidity and reduces bit deflection compared to jobber-length bits
• 118-degree conventional point angle suits general-purpose drilling across a range of materials
• Right-hand cutting flute geometry for standard drill press and CNC spindle rotation
• High-speed steel construction provides adequate hardness and toughness for everyday shop use
• Bright/uncoated finish — no coating buildup at the cutting edge, suitable for regrinding

Compatibility

Designed as a general-purpose screw machine length drill bit suitable for use in standard drill chucks, CNC tool holders, and machine tool spindles accepting the shank diameter corresponding to wire size No. 31.

Installation Notes

Installation and use of this bit should be performed by a qualified machinist or trained technician familiar with proper speeds, feeds, and workholding practices. Secure the workpiece firmly before drilling and ensure the drill chuck or collet is properly tightened before spindle engagement. Always wear appropriate eye protection and follow shop safety protocols when operating rotating cutting tools. Inspect the cutting edges before each use and remove the bit from service if chipping or excessive wear is observed.