Hertel 74129222 Straight-flute Drill Bit 15/64 in Carbide

Product Description

The HERTEL 74129222 is a straight-flute solid carbide drill bit designed for precision drilling in hard and difficult-to-machine metals. Built from C2-grade carbide with a bright, uncoated finish, it delivers consistent performance without the added friction of a coating. The 140-degree notched point geometry reduces walking at entry and improves hole accuracy. At 15/64 inches (0.2344 inches decimal), the diameter is held to a tight tolerance of +0.0000 to -0.0005 inches, making it well-suited for applications where hole size consistency is critical. Machinists, tool-and-die shops, and maintenance technicians handling hard-metal components rely on this geometry for repeatable results.

This drill bit is engineered for right-hand cutting in ferrous and specialty alloys. Primary workpiece materials include chrome alloy, heat-treated alloy, nickel alloy, stainless steel, steel, and titanium alloy. The web-thinned design reduces thrust load during penetration, which is especially valuable when drilling work-hardened stainless or nickel-based alloys on manual or CNC equipment. The two-flute straight configuration aids chip evacuation in short-to-moderate depth holes and provides rigidity on entry. No coolant-through capability is present on this model, so external coolant or cutting fluid application is the standard approach.

Key Features

• C2-grade solid carbide construction for hardness and wear resistance in alloy steels and exotic metals
• 140-degree notched point reduces entry walking and lowers thrust requirements
• Web-thinned design decreases cutting force in hard and work-hardened materials
• Tight diameter tolerance of +0.0000 to -0.0005 inches for consistent hole sizing
• Bright, uncoated finish suitable for use with cutting fluids where coating adhesion is not required
• Right-hand, two-flute straight-flute geometry for chip clearance in short-depth drilling

Compatibility

Designed for use in chrome alloy, heat-treated alloy, nickel alloy, stainless steel, steel, and titanium alloy workpieces. Compatible with standard drill chucks and collet systems accepting a 0.2344-inch shank diameter. Suitable for manual drill presses, mills, and CNC machining centers.

Installation Notes

This bit is intended for use by machinists and metalworking professionals on properly secured workpieces. Secure the shank firmly in the chuck or collet before operation and verify runout before drilling critical-tolerance holes. Because no coolant-through feature is present, apply cutting fluid externally to the drill point to manage heat and extend tool life when working in stainless, nickel, or titanium alloys. Inspect the cutting edges for chipping before each use, as carbide tooling is brittle and sensitive to side-loading or interrupted cuts.