Precision Twist Drill 5998597 Screw Machine Drill Bit

Product Description

The PRECISION TWIST DRILL 5998597 is a wire gauge size 10 screw machine length drill bit designed for high-performance drilling in demanding industrial and trade applications. At 0.1935 inches in diameter and 2.25 inches overall length, this bit is built from high-speed steel (HSS) with a steam oxide finish that reduces friction and extends tool life. The 135-degree split point starts on contact without a center punch, and the web-thinned, tapered web configuration reduces cutting force. It is sized for machinists, maintenance technicians, and metal fabricators who need a short, rigid bit for precision work in tight clearances or on drill presses and screw machines.

This drill bit is suited for drilling steel, stainless steel, cast iron, and high-temperature alloys. The screw machine length — shorter than a jobber bit — provides added rigidity and reduced deflection, making it a go-to choice for production drilling, fixture work, and any application where hole location accuracy matters. The 1.1875-inch flute length provides adequate chip clearance for typical hole depths in this size range. It conforms to ANSI and NAS 907 standards, confirming dimensional and performance compliance for specification-driven work.

Key Features

• 135-degree split point self-starts on contact, no center punch required
• Web-thinned tapered web reduces thrust and cutting force in hard metals
• Steam oxide coating minimizes friction and helps resist heat buildup
• Screw machine length (2.25 inches OAL) provides superior rigidity over jobber-length bits
• Right-hand cut, regular spiral flute, straight cylindrical shank for standard chuck compatibility
• Meets ANSI and NAS 907 standards for heavy-duty, high-performance applications

Compatibility

Designed for use in drilling steel, stainless steel, cast iron, and high-temperature alloys. Fits any standard drill chuck or collet accepting a 0.1935-inch straight shank. Conforms to ANSI and NAS 907 specification requirements.

Installation Notes

Install in a drill press, CNC machine, or hand drill with a chuck rated for straight-shank bits. Ensure the shank is fully seated and the chuck is tightened before operation. Use appropriate cutting fluid or coolant when drilling stainless steel or high-temperature alloys to manage heat and extend bit life. Inspect the cutting edges for wear before each use — a dull split-point bit generates excess heat and can work-harden stainless and alloy materials.