Hertel 83246397 Straight-flute Drill Bit No. 28 Solid Carbide

Product Description

The HERTEL 83246397 is a straight-flute drill bit sized to No. 28 wire gauge, equal to 0.1405 inches in diameter, designed for precision drilling in hard and difficult-to-machine materials. Built from C2-grade solid carbide with a bright, uncoated finish, it delivers the rigidity needed to maintain accuracy in demanding applications. The 140-degree notched point and web-thinned geometry reduce entry thrust, improve centering, and extend tool life in production environments. Right-hand cutting direction and a two-flute configuration make this a standard selection for machinists and toolroom technicians working with tight-tolerance hole requirements.

This drill bit is suited for use on ferrous and non-ferrous alloys where carbide tooling is required to maintain dimensional control. Primary workpiece materials include chrome alloy, heat-treated alloy, nickel alloy, stainless steel, carbon steel, and titanium alloy. It fits conventional drill presses, CNC machining centers, and manual lathes with appropriate collet or chuck holders accepting a 0.1405-inch shank. Typical applications include aerospace, defense, and industrial manufacturing where hole tolerance and material hardness demand carbide over high-speed steel tooling.

Key Features

• C2-grade solid carbide construction for hardness and wear resistance in alloy and stainless steel drilling
• 140-degree notched point reduces thrust and improves self-centering on hard workpieces
• Web-thinned geometry lowers cutting forces at entry and improves chip clearance
• Bright, uncoated finish — no coating buildup to affect dimensional tolerance
• Diameter tolerance held to +0.0000 to -0.0005 inches for tight-tolerance hole work
• Right-hand, two-flute straight-flute design compatible with standard drill press and CNC setups

Compatibility

Designed for use in drill presses, CNC machining centers, and manual machine tools that accept a straight-shank carbide drill bit with a 0.1405-inch shank diameter. Rated for primary and secondary use in chrome alloy, heat-treated alloy, nickel alloy, stainless steel, steel, and titanium alloy workpieces.

Installation Notes

Installation and use of this tool should be performed by qualified machinists or toolroom technicians familiar with carbide tooling requirements. Secure the shank fully in a collet or chuck rated for the shank diameter before operation, and verify runout before cutting. Carbide tooling is brittle — avoid side loading, interrupted cuts without proper setup, or drop impacts that can chip the cutting edges. Always follow machine tool manufacturer guidelines and applicable shop safety standards when operating drilling equipment.