Hertel 2385920 Drill Bit Letter E 135 Degree Hss

Product Description

The HERTEL 2385920 is a screw machine length drill bit designed for high-production drilling in metal, alloy, and general-purpose materials. Built from high-speed steel with an oxide coating, this bit handles heat and wear in demanding shop and field applications. The 135-degree split point reduces walking and lowers the thrust needed to start a hole, making it well-suited for harder materials and tight-tolerance work. The web-thinned construction improves chip evacuation and cutting efficiency. At 2.5 inches overall length, the shorter-than-jobber format increases rigidity and reduces deflection, which is critical when drilling at Letter E size — 0.250 inch decimal equivalent. Right-hand spiral flutes clear chips effectively during continuous drilling cycles.

This bit is intended for use in drill presses, CNC machining centers, turret lathes, and hand-held power drills where a stubby, rigid cutting tool is preferred. The straight cylindrical shank fits standard three-jaw chucks without adapters. Typical applications include through-hole drilling, clearance hole preparation, and tap-drill operations in steel, cast iron, aluminum, and similar materials. It is commonly used by machinists, maintenance mechanics, pipefitters, and HVAC sheet-metal technicians who need a reliable, production-grade drill bit for repetitive hole-making tasks.

Key Features

• 135-degree split point reduces thrust and prevents bit walking on contact
• Web-thinned, parallel-web construction improves chip flow and cutting speed
• Oxide-coated high-speed steel extends service life in metal-cutting applications
• Screw machine length (2.5 inches OAL) provides added rigidity and reduced deflection versus jobber-length bits
• Right-hand spiral flute with regular spiral geometry for general-purpose drilling
• Heavy-duty grade construction rated for high-production and continuous-duty use

Compatibility

Designed as an OEM-style replacement or standard production drill bit for any application requiring a Letter E (0.250 inch) screw machine length drill bit with a straight cylindrical shank.

Installation Notes

Installation should be performed by a qualified machinist or maintenance technician familiar with rotating cutting tools. Ensure the drill press or power tool is fully powered down and the chuck is stationary before inserting or removing the bit. Secure the straight cylindrical shank firmly in the chuck and verify concentricity before beginning a drilling cycle. Do not exceed the recommended feed and speed parameters for the workpiece material and bit diameter.