Accupro 63310171 Carbide Jobber Drill Bit No 39 140 Deg

Product Description

The ACCUPRO 63310171 is a solid carbide jobber-length drill bit sized to wire gauge No. 39 (0.0995 inches decimal equivalent). It carries an AlTiN (aluminum titanium nitride) coating for heat resistance and extended tool life in demanding materials. The 140-degree notched point geometry reduces thrust and improves self-centering on entry. A web-thinned, parallel-web construction further lowers cutting resistance. Overall length is 2 inches with a flute length of 0.634 inches and a maximum recommended drilling depth of 0.510 inches. The straight cylindrical shank measures 1/8 inch in diameter. This bit is graded High Performance and is suited for machinists, tool-and-die work, and precision drilling operations.

This drill bit is designed for small-diameter, precision drilling applications where tight tolerances and clean hole quality are required. Typical use cases include PCB drilling, instrument manufacturing, aerospace component work, and similar operations involving ferrous alloys, stainless steel, cast iron, and hardened materials where carbide and AlTiN coating provide a clear advantage over high-speed steel tooling. The regular spiral flute promotes chip evacuation in short-depth drilling cycles. It is sold as a single unit and is suited for use in CNC machining centers, drill presses, and precision hand-held drilling fixtures with a 1/8-inch collet or equivalent chuck.

Key Features

• Solid carbide construction for rigidity and wear resistance in hard materials
• AlTiN coating provides thermal barrier and reduces built-up edge at elevated cutting temperatures
• 140-degree notched point angle improves self-centering and reduces entry thrust
• Web-thinned parallel web lowers axial cutting force
• Regular spiral flute with 4xD flute-to-diameter ratio supports chip clearance in short-depth holes
• Straight cylindrical 1/8-inch shank fits standard collets and drill chucks

Compatibility

Designed as a standard jobber-length drill bit with a 1/8-inch straight cylindrical shank, compatible with CNC machining centers, drill presses, and drilling fixtures accepting 1/8-inch collets or equivalent chuck configurations. No specific OEM system compatibility is stated by the manufacturer for this part.

Installation Notes

Installation and use should be performed by a qualified machinist or tool operator familiar with carbide tooling requirements. Secure the shank fully in the collet or chuck before operation and verify runout is within acceptable limits, as carbide is brittle and sensitive to lateral loading. Do not use this bit beyond its rated maximum drilling depth of 0.510 inches per pass without retracting to clear chips. Cutting speeds and feeds should be set according to the workpiece material; carbide tooling typically runs at higher surface speeds than high-speed steel but requires rigid setups to avoid chipping.