Chicago-latrobe 46734 Cobalt Jobber Drill Bit No 64

Product Description

The CHICAGO-LATROBE 46734 is a cobalt jobber length drill bit sized to wire gauge No. 64 (0.0360 inches decimal equivalent) with a 135-degree split-point angle. Manufactured from M42 cobalt high-speed steel and finished with a gold oxide coating, this bit is built for high-performance drilling in hard and abrasive materials. The 2-flute spiral design with a web-thinned, tapered web reduces thrust and improves chip evacuation. Overall length is 1.5 inches, with a flute length of 0.625 inches and a straight-cylindrical shank of 0.0360 inches in diameter. It is installed by machinists, maintenance mechanics, and tool-and-die professionals working with tight-tolerance small-hole applications.

The 46734 is rated for use in titanium as its primary workpiece material, making it well suited for aerospace, medical device, and precision manufacturing environments where M42 cobalt steel outperforms standard high-speed steel bits. The gold oxide coating reduces friction and helps dissipate heat during drilling. Conformance to DIN 338 and NAS 907 Type J standards means this bit meets commonly specified requirements in aerospace and defense supply chains. The regular spiral and tapered web configuration keep the bit tracking straight in small-diameter, deep-relative-to-diameter holes.

Key Features

• M42 cobalt steel construction for heat resistance and edge retention in hard materials including titanium
• Gold oxide coating reduces friction and extends tool life in abrasive workpieces
• 135-degree split-point angle with web thinning reduces walking and lowers required thrust
• Tapered web configuration improves chip clearance in small-diameter holes
• Straight-cylindrical shank at 0.0360 inches fits standard collets and chucks for this size range
• Meets DIN 338 and NAS 907 Type J standards for aerospace and precision applications

Compatibility

Designed as a Series 550 heavy-duty jobber length drill bit for use with standard drill chucks and collets accepting a 0.0360-inch straight-cylindrical shank. Primary workpiece material rated for titanium; also applicable to stainless steel, nickel alloys, and other hard metals in precision drilling operations.

Installation Notes

Installation is performed by machinists or maintenance professionals using a drill press, CNC machining center, or hand drill with an appropriate precision chuck. Secure the shank fully in the chuck before operation and verify runout before drilling in critical applications. Use a cutting fluid or coolant appropriate for the workpiece material to manage heat, especially when drilling titanium or hardened steel. Replace the bit at the first sign of edge wear to maintain hole-diameter tolerance within the specified -0.0005 to 0.0000 inch range.