Precision Twist Drill 5998678 Jobber Drill Bit 11/32

Product Description

The PRECISION TWIST DRILL 5998678 is a jobber-length drill bit designed for general-purpose drilling in a wide range of materials. Ground from high-speed steel with a steam oxide coating, the bit features a 118-degree standard point angle, a two-flute regular spiral configuration, and a straight-cylindrical shank measuring 11/32 inch (0.3438 inch decimal). Overall length is 4.75 inches with a flute length of 3.4375 inches, giving it a 10xD flute-to-diameter ratio suited for through-hole and moderate-depth drilling. The web-thinned, tapered web design reduces thrust and improves chip clearance during use. This bit is intended for installation by machinists, maintenance technicians, HVAC and plumbing tradespeople, and any professional requiring reliable precision drilling on the bench or in the field.

The 5998678 is rated for drilling steel, stainless steel, cast iron, non-ferrous metals, superalloys, titanium, and other hard materials, covering ISO material codes P, M, K, N, and S. Its Series R10-R15-R18 designation places it within PRECISION TWIST DRILL's established jobber-length lineup, and it conforms to ANSI standards for straight-shank jobber bits. The bit is well suited to drill presses, hand drills, and magnetic-base drills commonly used in trade and light industrial settings. Coolant-through capability is not available on this model.

Key Features

• High-speed steel construction with steam oxide coating for corrosion resistance and reduced friction
• 118-degree standard point angle with web-thinned, tapered web for reduced entry thrust
• Two-flute regular spiral design promotes efficient chip evacuation
• Straight-cylindrical shank compatible with standard drill chucks
• Rated for steel, stainless steel, cast iron, non-ferrous metals, superalloys, and titanium
• Conforms to ANSI standards; Series R10-R15-R18

Compatibility

Designed as a general-purpose jobber-length replacement or stock drill bit for use in standard 3-jaw drill chucks accepting a straight-cylindrical 11/32-inch shank.

Installation Notes

Secure the shank fully in the drill chuck and verify concentricity before drilling. Always match spindle speed to the workpiece material and bit diameter per standard machining practice. When drilling hard materials such as stainless steel or titanium, apply cutting fluid to extend bit life and prevent work hardening. Wear appropriate PPE including eye protection whenever operating drilling equipment.