Hertel 74149071 Solid Carbide Drill Bit 1/2 Inch 135 Point

Product Description

The HERTEL 74149071 is a screw machine length drill bit designed for demanding metal cutting applications. Built from solid carbide grade C2, it delivers the hardness and heat resistance needed when drilling cast iron, nickel alloy, stainless steel, titanium alloy, and tool steel. The bit measures 0.5000 inches in diameter with an overall length of 3.75 inches and a flute length of 2.25 inches. A 135-degree split point reduces walking at startup and lowers thrust requirements compared to conventional 118-degree points. The bright uncoated finish makes it well-suited for applications where coating adhesion or contamination is a concern. Two spiral flutes with a slow helix and web-thinned, parallel web construction support chip evacuation in difficult-to-machine materials.

This drill bit is intended for use in screw machine operations and general production drilling where short, rigid tooling is required. Its solid carbide construction makes it appropriate for high-speed machining of hard and abrasive workpiece materials including stainless steel and titanium alloys. Right-hand cut, straight cylindrical shank design allows direct mounting in standard drill chucks, collets, or screw machine spindles. Typical users include machinists, tool and die makers, and production shop technicians working on CNC or manual equipment.

Key Features

• Solid carbide grade C2 construction for hardness and wear resistance in ferrous and difficult-to-machine materials
• 135-degree split point reduces drill walk and lowers axial cutting force
• Screw machine length (3.75 inches OAL) provides rigidity for accurate, stable drilling
• Slow spiral flutes with web thinning improve chip flow in deep or interrupted cuts
• Bright uncoated finish suitable for applications requiring uncoated tooling
• Diameter tolerance of +0.0000 to -0.0005 inches ensures close-tolerance hole sizing

Compatibility

Designed for use in screw machines, CNC machining centers, and manual drill presses with standard straight-shank tool holders or collet chucks accepting a 0.5000 inch shank. Rated for primary workpiece materials including cast iron, nickel alloy, stainless steel, titanium alloy, and tool steel.

Installation Notes

Installation and use should be performed by qualified machinists familiar with carbide tooling requirements. Carbide is brittle - avoid side loading, interrupted cuts without proper feed rate management, or re-chucking at an angle, as these can cause chipping or fracture. Ensure the spindle and chuck are clean and concentric before seating the shank. Verify that feeds and speeds are appropriate for the workpiece material and machine rigidity before beginning a cut.