Hertel 74129255 Solid Carbide Die Drill Bit 9/32 Inch

Product Description

The HERTEL 74129255 is a straight-flute solid carbide die drill bit designed for precision drilling in tough, hard-to-machine materials. Built from C2-grade carbide with a bright finish, this bit measures 9/32 inch (0.2813 inch decimal) in diameter and features a 140-degree notched point angle with a web-thinned tip for improved chip clearance and reduced thrust. It runs right-hand cutting direction and carries a tight diameter tolerance of +0.0000 to -0.0005 inch. Licensed machinists and tool-and-die technicians are the primary installers. Coolant-through capability is not included on this model.

This bit is suited for drilling chrome alloy, heat-treated alloy, nickel alloy, stainless steel, carbon steel, and titanium alloy workpieces in tool-and-die, aerospace component, and precision machining applications. The straight-flute geometry makes it appropriate for short-hole drilling in hard, abrasive materials where spiral flutes may flex or deflect under load. It ships as a single unit, making it a practical single-replacement option for worn tooling in production and job-shop environments.

Key Features

• C2-grade solid carbide construction for hardness and wear resistance in difficult alloys
• 140-degree notched point angle reduces walking and improves entry accuracy
• Web-thinned tip lowers axial thrust and eases chip evacuation at entry
• Tight tolerance of +0.0000 to -0.0005 inch holds close-fit hole requirements
• Straight-flute design suited for short-hole drilling in hard, abrasive workpiece materials
• Bright (uncoated) finish compatible with a wide range of cutting fluids and coolant types

Compatibility

Designed as a straight-flute die drill bit for use in hard and abrasive workpiece materials including chrome alloy, heat-treated alloy, nickel alloy, stainless steel, steel, and titanium alloy.

Installation Notes

This bit is installed and operated by machinists and tool-and-die technicians using standard drill press, CNC machining center, or manual milling equipment. Secure the shank fully in the chuck or collet before operation to prevent runout. Use appropriate cutting fluid for the workpiece material to extend tool life and maintain hole quality. Inspect the cutting edges for chipping before each use, as carbide is brittle and can fracture if dropped or mishandled.