Hertel 53383980 Drill Bit Letter D 135 Deg Hss Oxide

Product Description

The HERTEL 53383980 is a screw machine length drill bit designed for high-speed drilling in metal, plastic, and similar materials. Built from high-speed steel with an oxide coating, it carries a Letter D designation corresponding to a decimal diameter of 0.2460 inches. The 135-degree split-point geometry reduces walking and requires less entry force compared to conventional 118-degree points. At 1.25 inches overall length, this stub-length format provides increased rigidity in tight-clearance applications such as turret lathes, screw machines, and CNC drilling fixtures. Licensed machinists, tool-and-die makers, and maintenance technicians are the primary users.

This drill bit is suited for production and maintenance drilling operations where stub-length rigidity is preferred over jobber-length reach. The short flute length of 0.5625 inches minimizes deflection during high-cycle drilling. Typical installation contexts include screw machine shops, production floor drill presses, and manual or CNC machining centers requiring a compact, stiff drill profile. It is sold as a single unit and is appropriate wherever a Letter D diameter hole is required in a confined or supported setup.

Key Features

• Letter D diameter (0.2460 inches) for precise fractional-equivalent sizing
• 135-degree standard point angle reduces thrust and minimizes drill walk on entry
• High-speed steel construction provides hardness and heat resistance for metal drilling
• Oxide coating improves lubricity and provides mild corrosion resistance during storage and use
• Screw machine (stub) length of 1.25 inches overall delivers superior rigidity over jobber-length bits
• Regular spiral flute with 3xD flute-to-diameter ratio supports chip evacuation in short-hole drilling

Compatibility

Designed as an OEM-style replacement or production-use drill bit compatible with standard drill chucks and collet systems that accept straight-shank bits at the 0.2460-inch diameter range.

Installation Notes

Installation and use should be performed by machinists or qualified maintenance technicians familiar with drilling operations and machine tool safety. Ensure the drill press, lathe turret, or CNC spindle is fully powered down and locked out before changing tooling. Confirm the chuck or collet is tightened to the manufacturer specification for the machine in use before beginning a drilling cycle. Do not exceed the recommended surface footage for high-speed steel in the workpiece material being drilled.