Chicago-latrobe 44990 Cobalt Jobber Drill Bit No 20

Product Description

The CHICAGO-LATROBE 44990 is a cobalt jobber-length drill bit designed for high-performance drilling in hard and abrasive materials. Built to Series 550TA standards, this wire-gauge No. 20 bit measures 0.1610 inches in diameter and carries a TiAlN coating for extended tool life under elevated heat conditions. The 135-degree split point reduces thrust and improves centering without a pilot hole. With a 3.25-inch overall length and a regular spiral flute, this bit suits production drilling environments where tool durability and dimensional accuracy matter. It is installed by machinists, maintenance mechanics, and fabricators working with titanium, stainless steel, and other hard alloys.

The CHICAGO-LATROBE 44990 is built for drilling titanium and other difficult-to-machine materials where standard HSS tooling wears prematurely. The M42 cobalt steel construction and TiAlN coating maintain cutting performance at higher surface speeds and temperatures than standard M2 bits. The 135-degree split point with web thinning lowers entry force and chip load. This bit is well-suited for aerospace fabrication, general machining, and industrial maintenance applications requiring tight-tolerance holes in the 0.1500 to 0.2000-inch diameter range. It conforms to DIN 338 and NAS 907 Type J standards and carries an UNSPSC code of 23241634.

Key Features

• M42 cobalt steel construction resists heat and wear in hard-material drilling
• TiAlN coating extends tool life by reducing friction and thermal buildup
• 135-degree split point with web thinning lowers thrust and eliminates walking
• Right-hand, regular spiral flute promotes efficient chip evacuation
• Straight-cylindrical shank fits standard drill chucks and collets
• Conforms to DIN 338 and NAS 907 Type J specifications

Compatibility

Designed as a high-performance replacement for standard jobber-length drill bits in the No. 20 wire gauge size, with a stated primary workpiece material of titanium and a diameter range of 0.1500 to 0.2000 inches per NAS 907 Type J specification.

Installation Notes

This bit is installed by machinists and maintenance technicians using standard drill presses, CNC machining centers, or hand drills equipped with a compatible chuck. Secure the straight-cylindrical shank firmly in the chuck before operation to prevent slippage. Use appropriate cutting fluid or coolant for titanium and hard-alloy applications to manage heat and extend tool life. Inspect the cutting edges before each use and replace the bit if chipping or excessive wear is observed.