Chicago-latrobe 54057 Cobalt Jobber Drill Bit 15/64 in

Product Description

The CHICAGO-LATROBE 54057 is a cobalt jobber-length drill bit designed for high-performance drilling in tough materials. Built from M42 cobalt high-speed steel and coated with titanium nitride (TiN), it delivers extended tool life and heat resistance in demanding applications. The 135-degree split point reduces walking and requires less feed pressure at startup, making it well suited for production and maintenance drilling on hard metals. At 3-7/8 inches overall length with a 2-5/8 inch flute length, this bit fits standard jobber-length drill chucks and fits the hand of any experienced metalworker or trade technician.

This bit is engineered for drilling stainless steel and steel in residential, commercial, and industrial settings. The Series 2550 designation marks it as a heavy-duty line built to NAS 907 Type J and DIN 338 standards. Typical applications include HVAC sheet metal fabrication, plumbing rough-in drilling, electrical conduit and enclosure work, and general mechanical assembly where stainless or hardened steel is encountered. The right-hand spiral flute and web-thinned, tapered web geometry promote efficient chip evacuation in deep-hole drilling scenarios.

Key Features

• M42 cobalt steel construction for heat and wear resistance in hard-metal drilling
• Titanium nitride (TiN) coating extends cutting life and reduces friction
• 135-degree split point reduces thrust force and prevents bit walk on startup
• Web-thinned, tapered web improves chip clearance and reduces heat buildup
• Right-hand, 2-flute regular spiral design promotes smooth, consistent chip evacuation
• Meets NAS 907 Type J and DIN 338 standards for dimensional accuracy

Compatibility

Designed for use with standard jobber-length drill chucks accepting a 15/64 inch straight-cylindrical shank. Primary workpiece materials include stainless steel and steel as specified by the manufacturer.

Installation Notes

Installation of this bit is performed by qualified machinists, HVAC technicians, electricians, or plumbers using a standard drill press, magnetic drill, or hand-held drill with a keyed or keyless chuck. Secure the straight-cylindrical shank fully into the chuck before operation and confirm the chuck is tightened to prevent slippage. Use appropriate cutting fluid or coolant when drilling stainless steel to manage heat and extend bit life. Follow applicable shop safety practices and OSHA guidelines when operating rotary cutting tools.