Hertel 89322028 Screw Machine Drill Bit 1-3/16 in Hss

Product Description

The HERTEL 89322028 is a screw machine length drill bit designed for high-production drilling in metal, plastics, and similar materials. Built from high-speed steel (HSS) with a bright, uncoated finish, it measures 1.1875 inches (1-3/16 inches) in diameter and carries a standard 118-degree point angle. At 6-5/8 inches overall length, the screw machine format provides a shorter, stiffer profile than jobber-length bits, reducing deflection and improving hole accuracy in short-reach drilling applications. It features a straight shank, two regular spiral flutes, and is designed for right-hand cutting. General-purpose grade makes it a practical choice for machine shop and maintenance drilling operations.

This bit is suited for use in drill presses, milling machines, lathes, and CNC machining centers where a shorter drill body helps control runout and chatter. The 1-3/16 inch diameter targets large-bore applications common in fabrication, HVAC rough-in, pipe fitting, and structural work. The 4-1/4 inch flute length provides adequate chip clearance for the drill depth typical in screw machine setups. Machinists, millwrights, and trade professionals working with large-diameter through-holes will find this bit fits standard chuck and toolholder configurations for straight-shank tooling.

Key Features

• 1-3/16 inch (1.1875 inch) diameter for large-bore drilling
• 118-degree standard point angle for general-purpose materials
• High-speed steel construction for durability across common workpiece materials
• Screw machine length body reduces deflection versus jobber-length bits
• Bright, uncoated finish — suitable for use with standard cutting fluids
• Right-hand, regular spiral flutes for efficient chip evacuation
• Straight shank compatible with standard drill chucks and toolholders

Compatibility

Designed as an OEM-style replacement or standard tooling option for drill presses, CNC machining centers, and production drilling setups requiring a straight-shank screw machine length bit in the 0.6000 inch and larger size range.

Installation Notes

Installation and tool changes should be performed with the machine powered off and locked out per applicable OSHA lockout/tagout procedures. Secure the straight shank firmly in a properly sized chuck or toolholder to minimize runout before operation. Apply appropriate cutting fluid for the workpiece material to extend tool life and improve finish quality. Inspect the cutting edges and point for wear or damage before each use; a chipped or dull point on a large-diameter bit can cause workpiece damage and unsafe tool loading.