Chicago-latrobe 46785 Cobalt Jobber Drill Bit 0.316 in

Product Description

The CHICAGO-LATROBE 46785 is a cobalt jobber length drill bit engineered for high-performance drilling in hard and abrasive materials. Built to Series 550 standards, it features a 0.316-inch diameter, a 135-degree split point for accurate self-centering starts, and a gold oxide finish that improves lubricity and heat resistance during aggressive drilling operations. The M42 cobalt high-speed steel construction gives it superior red hardness, making it well suited for production and maintenance drilling where standard HSS bits wear prematurely. Licensed to DIN 338 and NAS 907 Type J specifications, this bit is a recognized choice for aerospace and heavy-duty industrial work. It is sold individually and is intended for use in standard drill presses, CNC machines, and hand-held power drills by machinists, maintenance mechanics, and industrial tradespeople.

The 46785 is rated for drilling titanium as its primary workpiece material, which also indicates capability across stainless steel, high-nickel alloys, and other difficult-to-machine metals commonly encountered in aerospace, oil and gas, and heavy manufacturing environments. The regular spiral flute and web-thinned, tapered web geometry reduce thrust requirements and improve chip evacuation during deep-hole drilling. The straight-cylindrical shank with a diameter of 0.316 inches fits standard drill chucks without adapters, making it straightforward to deploy across common machine tool setups.

Key Features

• M42 cobalt HSS construction provides high red hardness and wear resistance in titanium and hard alloys
• 135-degree split point reduces walking and lowers required feed pressure at entry
• Gold oxide finish improves surface lubricity and extends tool life in high-heat drilling
• Web-thinned tapered web reduces axial thrust and promotes efficient chip flow
• Conforms to DIN 338 and NAS 907 Type J specifications for aerospace and industrial use
• 2-flute regular spiral design with 3.1875-inch flute length supports chip evacuation in deeper cuts

Compatibility

Designed as a direct-fit jobber length drill bit for standard drill chucks accepting a 0.316-inch straight-cylindrical shank. Primary workpiece material rating is titanium per NAS 907 specification, with applicability to stainless steel and other hard metals consistent with M42 cobalt tooling of this type.

Installation Notes

Secure the straight-cylindrical shank firmly in a properly sized drill chuck before operation to prevent runout or slippage under load. Use appropriate cutting fluid or coolant when drilling titanium and hard alloys to manage heat buildup, even though this bit does not support coolant-through delivery. Follow machine tool manufacturer feed and speed recommendations for cobalt tooling on the specific workpiece material. Inspect the cutting edges and split point before each use and replace the bit if chipping or significant wear is visible.