Hertel 74148776 Screw Machine Drill Bit 7/64 Solid Carbide

Product Description

The HERTEL 74148776 is a screw machine length drill bit designed for high-performance drilling in hard and abrasive materials. Built from solid carbide with a bright uncoated finish, this bit measures 7/64 inch (0.1094 inches) in diameter and features a 135-degree split point for fast, accurate starts with minimal walking. The slow spiral flute design and web-thinned parallel web configuration are engineered specifically for drilling cast iron, nickel alloys, stainless steel, titanium alloys, and tool steel. Right-hand cut with a straight cylindrical shank, this bit is a standard choice for machinists and toolroom professionals working on precision production applications.

Screw machine length drill bits are shorter and more rigid than jobber-length bits, making them well suited for CNC machining centers, turret lathes, screw machines, and drill presses where stub-length rigidity reduces deflection and improves hole accuracy. This bit is appropriate for shops drilling hard ferrous and exotic alloy workpieces where a standard high-speed steel bit would wear prematurely. The solid carbide construction maintains cutting performance at elevated spindle speeds common in production environments. Overall length is 1-3/16 inches with a flute length of 13/16 inch.

Key Features

• Solid carbide construction for extended tool life in hard and abrasive materials
• 135-degree split point reduces thrust and eliminates center-punch requirement
• Slow spiral flute promotes chip evacuation in cast iron, stainless steel, and titanium alloys
• Web-thinned parallel web lowers cutting resistance and reduces heat buildup
• Straight cylindrical shank fits standard drill chucks and collets without modification
• Diameter tolerance of +0.0000 to -0.0005 inches for close-tolerance hole requirements

Compatibility

Designed as a screw machine length replacement bit for applications involving cast iron, nickel alloy, stainless steel, titanium alloy, and tool steel workpieces. Fits standard drill chucks and collets accepting 7/64 inch straight cylindrical shanks.

Installation Notes

Installation and use of this bit should be performed by qualified machinists familiar with carbide tooling. Carbide is brittle compared to high-speed steel - avoid lateral loading, interrupted cuts without appropriate feeds, and dropping the bit on hard surfaces. Secure the straight shank firmly in a collet or drill chuck to the manufacturer-specified runout tolerance before engaging the workpiece. Coolant-through capability is not available on this bit, so external coolant or cutting fluid application is recommended when drilling stainless steel or titanium alloys to manage heat.