Hertel 16704785 No. 52 Solid Carbide Screw Machine Drill Bit

Product Description

The HERTEL 16704785 is a screw machine length drill bit ground from solid carbide for demanding metal-removal applications. It carries a No. 52 wire size designation, equivalent to 0.0635 inches in decimal, and features a 135-degree split-point geometry that reduces walking and allows drilling to start without a center punch. The slow-spiral flute configuration controls chip evacuation in tough, stringy materials. At 1-11/16 inches overall length, the stub-length body provides maximum rigidity and minimizes deflection in short, precise hole operations. Machinists, tool-and-die technicians, and CNC operators rely on this geometry when tolerance and hole position are critical.

This bit is designed for drilling cast iron, nickel alloys, stainless steel, titanium alloys, and tool steel — materials that quickly wear high-speed steel tooling. It is well suited for production drilling on CNC machining centers, drill presses, and manual machines where short, stiff tooling is preferred. The straight-cylindrical shank seats directly into standard drill chucks and collet holders without adapters. Bright and uncoated finish keeps the carbide substrate at its natural hardness without a coating layer that could mask edge sharpness on regrind inspection.

Key Features

• Solid carbide construction for extended tool life in hard and abrasive workpiece materials
• 135-degree split-point angle reduces thrust force and eliminates center-punch requirement on most setups
• Slow-spiral flute design promotes controlled chip flow in tough alloys such as stainless steel and titanium
• Stub screw-machine length (1-11/16 inches OAL) maximizes rigidity and minimizes runout
• Straight-cylindrical shank fits standard drill chucks and ER collets without modification
• Bright and uncoated finish preserves full carbide hardness with no coating delamination risk

Compatibility

Designed as an OEM-style replacement screw machine drill bit for applications requiring a No. 52 wire size (0.0635 inch) hole in cast iron, nickel alloy, stainless steel, titanium alloy, or tool steel workpieces.

Installation Notes

Installation and use of this tooling should be performed by qualified machinists or tooling technicians familiar with carbide cutting tool handling. Carbide is brittle — inspect the cutting edges before chucking and avoid side-loading or impact that can chip the tip. Ensure the drill chuck or collet is properly tightened and the spindle is at the correct RPM and feed rate for the workpiece material before engaging the cut. Do not use this tool for interrupted cuts or in applications that generate high lateral force without confirming the setup is rigid enough to prevent bit breakage.