Chicago-latrobe 46736 Cobalt Jobber Drill Bit Wire 66

Product Description

The CHICAGO-LATROBE 46736 is a cobalt jobber length drill bit designed for high-performance drilling in hard and abrasive materials. Built from M42 cobalt high-speed steel with a gold oxide coating, this bit holds cutting edge hardness at elevated temperatures better than standard HSS tooling. Wire size 66 corresponds to a decimal diameter of 0.0330 inches. The 135-degree split point reduces walking on entry and lowers thrust requirements. A web-thinned, tapered web construction improves chip evacuation. This bit is sold individually and is intended for use by machinists, maintenance technicians, and trade professionals working with tight-tolerance drilling applications.

The 46736 is rated for drilling titanium as its primary workpiece material, making it well suited for aerospace, industrial maintenance, and precision fabrication work where standard HSS bits fail prematurely. The Series 550 design conforms to DIN 338 and NAS 907 Type J standards. With a straight cylindrical shank and regular spiral fluting, it fits standard drill chucks and is compatible with drill presses, hand drills, and CNC setups where a 0.0330-inch shank diameter is appropriate. The right-hand cut and spiral flute geometry clear chips efficiently in both ferrous and non-ferrous hard materials.

Key Features

• M42 cobalt HSS construction resists heat buildup during drilling in titanium and hard alloys
• Gold oxide coating reduces friction and extends tool life compared to uncoated cobalt bits
• 135-degree split point reduces thrust and prevents walking on entry without a center punch
• Web-thinned tapered web improves chip evacuation and lowers cutting resistance
• Meets DIN 338 and NAS 907 Type J standards for dimensional and performance consistency
• Straight cylindrical shank fits standard drill chucks and collets without modification

Compatibility

Designed as a heavy-duty OEM-style jobber drill bit in wire size 66 (0.0330 inches), suitable for use in any standard drill chuck or collet accepting a 0.0330-inch straight cylindrical shank. Primary workpiece material is titanium per Series 550 specification; also applicable to other hard metals and alloys where cobalt tooling is specified.

Installation Notes

Secure the shank fully in the drill chuck or collet and verify runout before drilling. Power down the drill press or CNC spindle completely before changing bits. Use appropriate cutting fluid for titanium and hard alloy applications to extend tool life and maintain dimensional tolerance. Diameter tolerance for this bit is -0.0005 to 0.0000 inches, so inspect the shank and flutes for damage before each use.