Chicago-latrobe 44374 Jobber Drill Bit Letter D Hss

Product Description

The CHICAGO-LATROBE 44374 is a jobber length drill bit sized to Letter D, equivalent to 0.2460 inches in decimal diameter. Built from high speed steel with a bright, uncoated finish, this bit delivers consistent performance in general-purpose drilling applications. The 118-degree standard point angle suits a broad range of material types and is the most common geometry stocked in trade shops and production environments. A web-thinned, tapered web reduces thrust at the tip, improving penetration and reducing walking on entry. Two spiral flutes with a regular helix evacuate chips efficiently throughout the cut. The 44374 meets DIN 338 dimensional standards and carries a straight-cylindrical shank for use in standard drill chucks.

This bit is intended for drilling non-ferrous metals as its primary application and handles general-purpose drilling in plastics, wood, and soft materials. The 4-inch overall length and 2.75-inch flute length make it suitable for through-hole and moderate-depth drilling in fabrication, maintenance, HVAC sheet metal work, plumbing rough-in, and electrical trade applications. Right-hand cut geometry is standard for conventional drill press and hand-drill use. No coolant-through feature is present, so external cutting fluid or dry cutting applies depending on material.

Key Features

• Letter D size: 0.2460 inches decimal diameter with a tolerance of -0.0007 to 0.0000 inches
• 118-degree standard point angle for broad material compatibility
• Web-thinned, tapered web for reduced entry thrust and improved centering
• High speed steel construction with bright, uncoated finish
• Two regular-helix spiral flutes for efficient chip evacuation
• Meets DIN 338 standards; Series 150D general-purpose grade

Compatibility

Designed as a general-purpose jobber length drill bit compatible with any standard drill chuck accepting a 0.2460-inch straight-cylindrical shank, including hand drills, drill presses, and CNC drill heads without coolant-through requirements.

Installation Notes

Secure the shank fully in the chuck and verify concentricity before drilling. Use appropriate cutting fluid or dry-cutting technique based on workpiece material; no internal coolant path is present on this bit. Inspect the cutting edges and web before use and replace the bit if chipping or excessive wear is observed. Follow applicable shop safety practices including eye protection and workpiece fixturing.