Chicago-latrobe 44125 No 55 Jobber Drill Bit Hss

Product Description

The CHICAGO-LATROBE 44125 is a jobber-length twist drill bit sized to wire gauge No. 55, with a decimal diameter of 0.0520 inches. Built from high speed steel with an oxide finish, it is designed for general-purpose drilling in cast iron and steel. The 118-degree standard point angle and web-thinned, tapered web construction promote clean entry and reduce walking on entry. With an overall length of 1.875 inches and a 0.875-inch flute length, this bit fits standard drill chucks and is well-suited for precision work requiring small-diameter holes in metalworking and fabrication environments. Machinists, maintenance technicians, and tool-and-die shops are the primary users.

This bit is intended for drilling cast iron and steel in production and maintenance applications. The No. 55 wire size makes it a common choice for tap-drill operations, pin holes, and clearance holes in light-gauge metal fabrication. The jobber-length format provides the balance of reach and rigidity needed for hand drills, drill presses, and CNC setups where a straight-cylindrical shank is required. The oxide coating provides a basic level of lubricity and corrosion resistance during storage and use.

Key Features

• Wire gauge No. 55 size with 0.0520-inch decimal diameter
• 118-degree standard point angle with web-thinned, tapered web for clean entry
• High speed steel construction rated for cast iron and steel
• Oxide coating for surface protection and reduced friction
• Right-hand spiral flute with regular helix for efficient chip evacuation
• Straight-cylindrical shank compatible with standard chucks
• Conforms to DIN 338 standard

Compatibility

Designed as a general-purpose jobber-length drill bit for use in hand drills, drill presses, and CNC machines accepting a straight-cylindrical shank of 0.0520 inches in diameter. Primary workpiece materials are cast iron and steel per Series 150 specifications.

Installation Notes

Installation is performed by machinists or maintenance technicians using standard drill chucks. Secure the shank fully in the chuck before operation and verify the spindle is at the correct RPM for small-diameter HSS bits in ferrous materials. Secure the workpiece firmly to prevent movement. Do not apply excessive feed pressure on small-diameter bits, as deflection and breakage are common failure modes.