Hertel 74129198 Straight-flute Drill Bit 3/16 in Carbide

Product Description

The HERTEL 74129198 is a straight-flute drill bit designed for demanding metal-cutting applications. Built from C2 carbide with a bright, uncoated finish, this 3/16 inch (0.1875 inch) diameter bit features a 140-degree notched point and web-thinned geometry that reduces thrust and improves chip clearance in tough materials. The straight-flute design is well suited for short-chipping materials where a standard spiral flute would pack and bind. Machinists, tool and die technicians, and metalworking professionals reach for this bit when working in hard, exotic, or abrasion-resistant alloys that demand rigidity and edge retention over a standard high-speed steel bit.

This drill bit is rated for use in chrome alloy, heat-treated alloy, nickel alloy, stainless steel, carbon steel, and titanium alloy workpieces, making it a reliable choice for aerospace, automotive, and industrial fabrication setups. It performs in both production drilling on CNC machining centers and manual drilling on knee mills or drill presses where precise, repeatable hole sizing is required. The 3/16 inch shank diameter matches the bit body, allowing it to seat directly in standard collets and drill chucks without a reduction sleeve.

Key Features

• C2 carbide construction delivers hardness and wear resistance in abrasive and high-strength alloys
• 140-degree notched point reduces walking and minimizes the need for a center punch on hard stock
• Web-thinned geometry lowers cutting thrust and extends tool life in difficult materials
• Straight-flute design handles short-chipping materials such as stainless steel and titanium alloy without packing
• Bright, uncoated finish maintains dimensional accuracy and suits applications where coatings may interfere with tolerances
• Diameter tolerance of +0.0000 to -0.0005 inches ensures consistent, on-size holes

Compatibility

Designed for use with standard drill chucks and collet holders accepting a 3/16 inch straight shank. Primary and secondary workpiece materials include chrome alloy, heat-treated alloy, nickel alloy, stainless steel, steel, and titanium alloy.

Installation Notes

Secure the shank fully in the chuck or collet before beginning a cut to prevent runout and premature edge wear. Carbide is brittle compared to high-speed steel - avoid interrupted cuts or side-loading that can chip the cutting edge. Apply appropriate cutting fluid for the workpiece material to manage heat and extend tool life. Inspect the cutting edges and point before each use; do not run a chipped carbide bit, as edge failure can damage the workpiece and create a safety hazard.