Hertel 74148735 Screw Machine Drill Bit 5/64 Solid Carbide

Product Description

The HERTEL 74148735 is a screw machine length drill bit ground from solid carbide and designed for high-precision hole-making in tough workpiece materials. At 5/64 inch (0.0781 inches) in diameter, it features a 135-degree split point that self-centers on contact and reduces the thrust needed to start a cut. The slow spiral flute geometry controls chip evacuation in difficult alloys while maintaining rigidity in a compact 1-11/16 inch overall length. The bright, uncoated finish makes it well-suited for applications where coating buildup or contamination is a concern. Machinists and toolroom technicians working with hard or abrasive materials will find the solid carbide construction provides the stiffness needed at this small diameter.

This drill bit is rated for right-hand cutting and is intended for use in screw machine operations, CNC drilling centers, and manual drill press setups where short, stiff tooling is required. Primary workpiece materials include cast iron, nickel alloy, stainless steel, titanium alloy, and tool steel. The straight cylindrical shank accepts standard drill chucks and collet systems without special tooling. The 11/16 inch flute length suits shallow-to-moderate hole depths typical of screw machine cycle work.

Key Features

• Solid carbide construction provides rigidity and wear resistance in hard and abrasive alloys
• 135-degree split point self-centers and reduces walking on hardened or smooth surfaces
• Slow spiral flute geometry manages chip flow in difficult materials such as stainless steel and titanium alloy
• Web-thinned, parallel-web configuration reduces cutting resistance at the tip
• Bright, uncoated finish suitable for applications where coating adhesion or contamination is undesirable
• Tight diameter tolerance of +0.0000 to -0.0005 inches supports close-tolerance hole requirements

Compatibility

Designed as a screw machine length replacement drill bit for operations on cast iron, nickel alloy, stainless steel, titanium alloy, and tool steel workpieces. Fits any standard drill chuck or collet accepting a straight cylindrical shank at 5/64 inch diameter.

Installation Notes

Installation and tool changes should be performed by a qualified machinist with the spindle fully stopped and the machine locked out per facility safety procedures. Secure the straight cylindrical shank firmly in a properly sized collet or drill chuck before running the spindle. At small diameters like 5/64 inch, solid carbide is brittle - avoid side loading, interrupted cuts without appropriate feed reduction, or dropping the bit on hard surfaces. Consult the machine manufacturer and applicable OSHA or ANSI machining standards for correct speeds and feeds for the workpiece material.