Chicago-latrobe 46749 Cobalt Jobber Drill Bit Wire 79

Product Description

The CHICAGO-LATROBE 46749 is a cobalt jobber length drill bit designed for high-performance drilling in hard and abrasive materials. It carries a wire gauge size of 79, with a decimal diameter of 0.0145 inches and a 135-degree split-point tip that reduces walking and improves hole entry accuracy. The gold oxide coating adds surface hardness and heat resistance. At 0.75 inches overall length with a 0.125-inch flute length, this is a precision small-diameter bit suited for tight-tolerance applications. It is installed and used by machinists, aerospace technicians, and trade professionals working in metal fabrication and maintenance environments.

This drill bit is rated for use on titanium as its primary workpiece material, making it well-suited for aerospace, medical, and industrial maintenance applications where high-strength alloys are common. The Series 550 designation, M42 cobalt material grade, and compliance with DIN 338 and NAS 907 Type J standards indicate this bit is built for heavy-duty, precision drilling where standard high-speed steel bits would dull prematurely. It is sold individually but requires a minimum order of 12 units per order.

Key Features

• M42 cobalt material grade for superior heat and wear resistance in hard materials
• 135-degree standard point angle reduces bit walking on entry without a center punch
• Gold oxide coating provides added surface hardness and lubricity
• Web-thinned, tapered web construction reduces thrust and improves chip evacuation
• Right-hand cut with regular spiral flute for standard drilling operations
• Meets DIN 338 and NAS 907 Type J standards for dimensional and performance consistency

Compatibility

Rated for drilling titanium as the primary workpiece material. Suitable for use in standard drill chucks and CNC spindles accepting a straight cylindrical shank of 0.0145 inches. Conforms to NAS 907 Type J and DIN 338 specifications for jobber length drill bits in the 0.0000 to 0.0500 inch size range.

Installation Notes

This bit should be installed by a qualified machinist or trade professional familiar with small-diameter precision drilling. Secure the straight cylindrical shank firmly in a compatible drill chuck before operation and verify runout before drilling into workpiece material. When drilling titanium or other hard alloys, use appropriate cutting fluid and controlled feed pressure to prevent bit breakage. At this diameter, bits are fragile and must not be subjected to side loading or excessive feed force.