Chicago-latrobe 44742 Wire Size 72 Hss Jobber Drill Bit

Product Description

The CHICAGO-LATROBE 44742 is a jobber length drill bit from the Series 150ASP line, manufactured from high speed steel with an oxide coating for added surface protection. Sized to wire gauge 72 with a decimal diameter of 0.0250 inches, it features a 135-degree split point angle that reduces walking on entry and improves hole location accuracy. The web-thinned, tapered web construction lowers thrust requirements during drilling. With a right-hand spiral flute and straight-cylindrical shank, this bit is built for precision small-diameter work in production and maintenance environments. It meets NAS 907 Type B standards and is rated for heavy-duty performance.

This drill bit is suited for drilling cast iron, stainless steel, and steel in both shop and field applications. The 0.0250-inch diameter makes it appropriate for small fastener pilot holes, instrument panel work, and close-tolerance drilling tasks where wire gauge sizing is specified. The 1-1/8-inch overall length fits standard drill chucks used by machinists, HVAC fabricators, and general maintenance technicians. The oxide finish helps reduce friction and extends tool life in ferrous materials.

Key Features

• Wire size 72, 0.0250-inch decimal diameter with a tolerance of -0.0005 to 0.0000 inches
• 135-degree standard split point reduces bit walking and improves entry accuracy
• High speed steel construction with oxide coating for durability in ferrous materials
• Web-thinned tapered web reduces drilling thrust on small-diameter holes
• Right-hand cut with regular spiral flute for efficient chip evacuation
• Meets NAS 907 Type B specification for consistent dimensional quality

Compatibility

Designed as a jobber length replacement drill bit for applications requiring wire gauge 72 sizing in cast iron, stainless steel, and steel workpieces per NAS 907 Type B standards.

Installation Notes

Install in a drill press, hand drill, or CNC spindle with a chuck rated for the 0.0250-inch straight-cylindrical shank diameter. Secure the shank fully and confirm runout before drilling to prevent bit deflection at this small diameter. Use appropriate cutting fluid when drilling stainless steel to manage heat buildup. Inspect the cutting edges before each use, as small-diameter bits are susceptible to tip damage from improper storage or excessive feed pressure.