Chicago-latrobe 46745 Cobalt Jobber Drill Bit 75

Product Description

The CHICAGO-LATROBE 46745 is a cobalt jobber-length drill bit in wire size 75 (0.0210 inches decimal), designed for high-performance drilling in hard and abrasive materials. Built to M42 cobalt steel with a gold oxide coating, this bit delivers extended tool life in applications where standard high-speed steel falls short. The 135-degree split point starts on contact without a center punch, and the web-thinned, tapered web design reduces thrust and improves chip evacuation. At 1.0 inch overall length with a 0.25-inch flute length, this is a precision small-diameter bit suited for metalworking trades, aerospace maintenance, and precision fabrication shops.

This bit is rated for drilling titanium and other hard workpiece materials where M42 cobalt is the specified grade. The straight-cylindrical shank at 0.0210 inches diameter fits standard drill chucks and collet-style holders used in hand drills, drill presses, and CNC applications. Series 550 designation places it within Chicago-Latrobe's heavy-duty line, built to DIN 338 and NAS 907 Type J standards. Typical install environments include aerospace sheet metal work, precision machining, and any application requiring repeatable accuracy in small wire-gauge hole sizing.

Key Features

• M42 cobalt steel construction for drilling titanium and other hard materials
• Gold oxide coating extends cutting edge life and reduces heat buildup
• 135-degree standard split point for self-starting entry without center punching
• Web-thinned tapered web reduces drilling thrust on small-diameter bores
• Right-hand spiral flute promotes chip clearance in deep holes
• Meets DIN 338 and NAS 907 Type J standards for aerospace and industrial use

Compatibility

Designed as an OEM-style replacement and standard production drill bit for use in applications requiring wire gauge size 75 (0.0210 inches) holes, compatible with any drill chuck or collet accepting a 0.0210-inch straight-cylindrical shank.

Installation Notes

Installation and use of this drill bit should be performed by machinists, toolroom technicians, or qualified metalworking tradespeople. Secure the straight-cylindrical shank firmly in a properly sized collet or drill chuck before operation, and verify chuck runout is within tolerance for small-diameter work. Disconnect power to the drill or machine before changing bits. Do not exceed recommended feed rates for the workpiece material, as small-diameter cobalt bits are susceptible to breakage under lateral load.