Chicago-latrobe 46735 Cobalt Drill Bit No. 65 Wire Size

Product Description

The CHICAGO-LATROBE 46735 is a cobalt jobber-length drill bit in wire gauge size No. 65 (0.0350 inches decimal) with a 135-degree split-point angle. Built from M42 cobalt high-speed steel and finished with a gold oxide coating, this bit is engineered for high-performance drilling in hard and abrasive materials. The web-thinned, tapered-web geometry reduces thrust and improves centering at start. Overall length is 1.5 inches with a flute length of 0.625 inches. Drill diameter tolerance is held to -0.0005 to 0.0000 inches, meeting the close-tolerance demands common in aerospace and precision metalworking applications.

This bit is rated for titanium as its primary workpiece material, making it well-suited to aerospace maintenance, precision machining, and manufacturing environments where conventional HSS bits fail prematurely. The straight-cylindrical shank fits standard drill chucks without modification. Its Series 550 designation indicates compliance with DIN 338 and NAS 907 Type J standards, which are commonly specified in aerospace and defense fabrication workflows. Installation is by a licensed machinist, tool-and-die professional, or qualified maintenance technician working with small-diameter precision drilling setups.

Key Features

• M42 cobalt HSS construction for extended tool life in hard and abrasive materials including titanium
• 135-degree split-point angle with web-thinned, tapered-web geometry for reduced thrust and self-centering entry
• Gold oxide coating reduces friction and improves chip evacuation
• Diameter tolerance of -0.0005 to 0.0000 inches for precision, close-tolerance applications
• Right-hand spiral flute with regular helix for consistent chip clearing in deep holes
• Meets DIN 338 and NAS 907 Type J standards

Compatibility

Designed as an OEM-style replacement or direct substitute for No. 65 wire-gauge jobber-length drill bits in applications governed by NAS 907 Type J and DIN 338 specifications. Compatible with any standard straight-shank drill chuck accepting a 0.0350-inch shank diameter.

Installation Notes

Installation and use of small-diameter precision drill bits should be performed by a qualified machinist or maintenance technician. Secure the straight-cylindrical shank firmly in a calibrated drill chuck before operation and verify runout with a dial indicator when tolerance is critical. Avoid excessive feed pressure on wire-gauge diameter bits, as breakage risk increases significantly with lateral force. Always wear appropriate eye protection and follow applicable shop safety standards when drilling titanium or other hard alloys.