Hertel 74129156 Straight-flute Drill Bit 1/8 in Carbide

Product Description

The HERTEL 74129156 is a straight-flute drill bit designed for precision drilling in hard and difficult-to-machine materials. Manufactured from C2-grade solid carbide with a bright/uncoated finish, this bit measures 1/8 inch (0.1250 inch decimal) in diameter and features a 140-degree notched point geometry. The web-thinned design reduces thrust requirements at entry and improves chip clearance. With two right-hand cutting flutes and tight diameter tolerances of +0.0000 to -0.0005 inches, this bit is suited for applications where hole accuracy and tool life in hard alloys are the primary concerns. It weighs 0.02 pounds.

This drill bit is intended for professional machinists and tool-room applications where the workpiece material demands carbide hardness and edge retention. Primary and secondary workpiece materials include chrome alloy, heat-treated alloy, nickel alloy, stainless steel, steel, and titanium alloy. It is well-suited for CNC drilling operations, fixture work, and precision hole-making in aerospace, defense, and industrial manufacturing environments where consistent hole quality in tough substrates is required.

Key Features

• C2-grade solid carbide construction for hardness and wear resistance in tough alloys
• 140-degree notched point geometry reduces walking and improves entry accuracy
• Web-thinned design lowers thrust force requirements and improves chip flow
• Tight diameter tolerance of +0.0000 to -0.0005 inches for close-tolerance hole work
• Bright/uncoated finish compatible with a wide range of cutting fluids and coolant strategies
• Right-hand cut with two flutes for standard CNC and manual drill press use

Compatibility

Designed for use in standard 1/8-inch drill chucks and collet systems. Rated for drilling chrome alloy, heat-treated alloy, nickel alloy, stainless steel, steel, and titanium alloy workpieces. No coolant-through capability; external coolant application recommended for extended cuts in hard materials.

Installation Notes

Installation and use should be performed by qualified machinists or tooling technicians familiar with carbide tooling requirements. Secure the bit firmly in a collet or drill chuck rated for the shank diameter before operation. Carbide is brittle and susceptible to fracture under side-loading or interrupted cuts; avoid flexing the bit during use. Always verify spindle speed and feed rate settings are appropriate for the workpiece material and bit diameter before starting the cut.