Hertel 74129172 Straight-flute Drill Bit 5/32 in Carbide

Product Description

The HERTEL 74129172 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 where high wear resistance is required. The 140-degree notched point and web-thinned geometry reduce thrust and improve self-centering at the start of the cut. At 5/32 inches (0.1563 inches decimal) in diameter, it holds a tight tolerance of +0.0000 to -0.0005 inches. Two right-hand flutes provide efficient chip evacuation in short-chipping ferrous and exotic alloy materials. This bit is a production-grade tool suited for machine shop and field fabrication environments.

This drill bit is built for use in CNC machining centers, drill presses, and handheld industrial drilling equipment where close-tolerance hole quality is needed. Primary workpiece materials include stainless steel, chrome alloy, heat-treated alloy, nickel alloy, titanium alloy, and general steel stock. The straight-flute design is particularly effective in brittle or thin-wall materials where standard spiral flutes may cause chipping or walkout. Machinists, toolmakers, and skilled fabricators working in aerospace, oil and gas, and heavy industrial applications will find this bit well-suited to demanding hole tolerances.

Key Features

• Solid C2-grade carbide construction for extended tool life in hard metals
• 140-degree notched point reduces entry thrust and improves center-start accuracy
• Web-thinned geometry lowers cutting force in stainless steel and alloy applications
• Straight-flute design controls chipping in brittle and short-chipping materials
• Right-hand cutting direction with 2-flute configuration for clean chip removal
• Diameter tolerance of +0.0000 to -0.0005 inches for close-fit hole requirements

Compatibility

Designed for drilling chrome alloy, heat-treated alloy, nickel alloy, stainless steel, steel, and titanium alloy workpieces. Suitable for use in standard drill chucks and collet systems accepting a 5/32-inch (0.1563-inch decimal) shank diameter.

Installation Notes

This tool is installed and operated by machinists, toolmakers, and industrial drilling technicians. Before mounting, confirm the chuck or collet is clean and rated for the shank diameter to prevent runout. Use appropriate cutting fluid or coolant at the workpiece when drilling stainless or titanium alloys to manage heat buildup, even though this bit does not have through-coolant capability. Inspect the cutting edges and point geometry before each use and remove from service at the first sign of chipping or dulling to maintain hole-quality standards.