Hertel 61699872 Screw Machine Drill Bit Letter U Hss

Product Description

The HERTEL 61699872 is a screw machine length drill bit sized to Letter U (0.3680 inches decimal equivalent) and designed for general-purpose metal drilling in production and maintenance environments. Built from high-speed steel with an oxide finish, it runs a standard 118-degree point angle that suits a wide range of common materials. The screw machine length format keeps the bit compact and rigid, reducing deflection in drill press, turret lathe, and CNC applications where stub reach is preferred. Licensed machinists, maintenance technicians, and tool-room professionals are the primary users. Two spiral flutes evacuate chips efficiently across the 1.8125-inch flute length, and the straight cylindrical shank seats securely in standard chucks.

This bit is suited for right-hand drilling operations in metals including mild steel, cast iron, aluminum, and similar materials where a general-purpose HSS tool is appropriate. The screw machine length geometry - shorter overall length compared to jobber bits - is especially practical on drill presses and CNC machining centers where workpiece clearance is limited or where rigidity and reduced runout are priorities. The ANSI specification designation confirms dimensional conformance to accepted industry standards, making it a reliable drop-in for production tooling setups.

Key Features

• Letter U size - 0.3680 inches decimal equivalent for precise hole sizing
• 118-degree standard point angle for general-purpose drilling across common metals
• High-speed steel construction provides durability and heat resistance in production use
• Oxide coating improves lubricity and surface hardness for extended tool life
• Screw machine length (3.125 inches OAL) delivers added rigidity and reduced deflection versus jobber-length bits
• 2-flute spiral design promotes efficient chip evacuation through 1.8125-inch flute length
• ANSI-conformant dimensions ensure compatibility with standard toolholding setups

Compatibility

Designed as a general-purpose screw machine length drill bit compatible with standard straight-shank chucks and collet holders across drill press, turret lathe, and CNC machining center applications. Sized per ANSI specification for Letter U drill diameter range (0.3500 to 0.4000 inches).

Installation Notes

Installation and use should be performed by qualified machinists or maintenance personnel familiar with rotating cutting tools. Secure the straight cylindrical shank firmly in a properly sized chuck or collet before operation, and confirm the spindle is fully stopped before making any chuck adjustments or bit changes. Appropriate cutting fluid or lubrication is recommended for ferrous materials to extend tool life and maintain hole quality. Always wear appropriate eye and hand protection when operating drilling equipment.