Precision Twist Drill 5995872 No. 40 Jobber Drill Bit

Product Description

The PRECISION TWIST DRILL 5995872 is a No. 40 wire-gauge jobber-length drill bit ground from high-speed steel (HSS) with a bronze straw coating. The 135-degree split-point geometry reduces walking on entry and requires no center punch on most materials. At 2.375 inches overall length with a 1.375-inch flute, this is a standard jobber proportion suited for hand-held drills, drill presses, and CNC setups running small-diameter work. The web-thinned, tapered-web construction keeps cutting forces low and chip evacuation clean. Rated for general-purpose use with a heavy-duty grade designation, it carries ANSI specification compliance and is cataloged for high-temperature alloy applications.

This bit is sized at 0.0980 inches (decimal) and is a frequent choice for tapping pilot holes, instrument and panel work, sheet-metal drilling, and precision machining where wire-gauge sizing is specified. The straight cylindrical shank seats directly in standard Jacobs-style chucks and collet holders without adapters. The Series HX10-HX15-HX18 designation places it within a family of HSS jobber bits covering the 0.0500-to-0.1000-inch decimal range. Right-hand spiral flute cutting direction is compatible with standard forward-rotation spindles. Typical users include machinists, HVAC sheet-metal technicians, electricians, and maintenance trades working with small-diameter hole requirements.

Key Features

• No. 40 wire gauge, 0.0980-inch decimal diameter — precise sizing for tap-drill and instrument work
• 135-degree split point reduces drill walk and lowers thrust force on entry
• HSS construction with bronze straw coating for lubricity and mild heat resistance
• Web-thinned, tapered web for improved chip clearance and reduced cutting resistance
• 1.375-inch flute length supports maximum drilling depth of 1.375 inches
• ANSI-compliant, heavy-duty grade, Series HX10-HX15-HX18

Compatibility

Designed for use in standard Jacobs-style drill chucks and collet holders accepting a 0.0980-inch straight cylindrical shank. Rated for drilling high-temperature alloys and general-purpose materials across the HX10-HX15-HX18 series range of 0.0500 to 0.1000 inches decimal.

Installation Notes

Secure the shank fully in the chuck or collet before applying power. At this diameter, use moderate feed pressure to avoid bit deflection or breakage — small HSS bits are susceptible to side-loading. Power down the drill or machine and confirm the spindle has stopped completely before changing bits. Cutting fluid or light oil is recommended when drilling hard or high-temp alloys to extend tool life.