Hertel 89321053 Screw Machine Drill Bit Letter B Hss

Product Description

The HERTEL 89321053 is a screw machine length drill bit sized to Letter B (0.2380 inches) with a 118-degree split point and a bright, uncoated high-speed steel construction. Screw machine length bits are shorter than jobber-length bits, which increases rigidity and reduces deflection during drilling operations. This geometry makes the 89321053 well suited for drilling in tight clearance areas and on automatic or semi-automatic screw machines where a compact, stiff tool path is critical. The right-hand cut and general-purpose grade make it a standard production tool for machinists and maintenance professionals working in metal fabrication, job shops, and industrial maintenance environments.

This bit is designed for general-purpose drilling in ferrous and non-ferrous metals, plastics, and similar materials. The screw machine length format is commonly used on turret lathes, CNC lathes, drill presses, and bench-top screw machines. Its compact overall length of 2.5 inches keeps the tool close to the chuck, reducing runout and improving hole accuracy in production drilling applications. Machinists working in high-volume metal cutting environments will find the standard bright finish appropriate for use with cutting fluids on most common workpiece materials.

Key Features

• Letter B sizing at 0.2380 inches for standard fractional and letter-size hole requirements
• 118-degree drill point angle — a general-purpose geometry for use on a broad range of materials
• Screw machine (stub) length design increases rigidity and reduces deflection compared to jobber-length bits
• High-speed steel construction provides adequate hardness and toughness for production drilling at moderate speeds
• Bright, uncoated finish is compatible with a wide range of cutting fluids and oils
• Right-hand cut for use in standard clockwise-rotating spindles

Compatibility

Designed as a general-purpose screw machine length drill bit for use in standard drill chucks, turret lathes, CNC lathes, drill presses, and screw machines that accept Letter B diameter tooling.

Installation Notes

Installation and use should be performed by a qualified machinist or maintenance professional familiar with rotating cutting tools. Ensure the spindle is fully stopped and the machine is de-energized or locked out before securing or removing the bit from the chuck. Use appropriate cutting fluid for the workpiece material to extend tool life and improve hole finish. Never exceed the recommended speed and feed for the workpiece material and tool diameter.