Hertel 89320840 Screw Machine Drill Bit 1/4 Inch Hss

Product Description

The HERTEL 89320840 is a screw machine length drill bit designed for high-volume drilling in metal, wood, and plastic applications. Built from high-speed steel with a bright, uncoated finish, this bit features a 118-degree split point angle suited for general-purpose use. The shortened overall length of 2.5 inches over a standard jobber bit reduces deflection and improves rigidity when drilling in tight spaces or on drill presses and CNC machines. Right-hand cut geometry removes chips efficiently and reduces heat buildup during operation. Machinists, maintenance technicians, and fabricators use this bit for production drilling where control and repeatability matter.

This screw machine length drill bit is used in metalworking, fabrication shops, and maintenance environments where shorter drill length improves rigidity and accuracy. The 0.2500 inch diameter is a common size for tapping pilot holes, clearance holes for fasteners, and precision drilling operations. It fits standard drill chucks on benchtop drill presses, hand drills, and CNC machining centers. The general-purpose grade makes it a go-to stock item for everyday shop drilling tasks across a wide range of base materials.

Key Features

• High-speed steel construction for durability across metal, wood, and plastic
• 118-degree drill point angle for general-purpose cutting performance
• Bright, uncoated finish — suitable for standard drilling without additional surface treatment
• Screw machine length at 2.5 inches OAL reduces deflection and improves hole accuracy
• Right-hand cut for use with standard forward-rotating drill chucks
• 1.375-inch flute length supports chip evacuation throughout the cut

Compatibility

Designed as a general-purpose screw machine length drill bit compatible with standard drill chucks accepting a 0.2500 inch shank diameter on drill presses, hand drills, and CNC machining centers.

Installation Notes

Secure the bit firmly in the drill chuck and verify runout before beginning a cut. Always wear appropriate eye protection and ensure the workpiece is clamped or fixtured before drilling. For metal drilling, use a cutting fluid or lubricant to extend bit life and improve surface finish. Replace the bit if the cutting edge shows signs of glazing, chipping, or excessive heat discoloration.