Precision Twist Drill 5995616 Cobalt Drill Bit Set 29pc

Product Description

The PRECISION TWIST DRILL 5995616 is a 29-piece cobalt screw machine length drill bit set built for metalworking and multipurpose drilling applications. Each bit in the M40CO series features a 135-degree split-point tip that self-centers on contact, reducing walking and the need for a center punch. The cobalt construction handles hard and abrasive metals that would wear out standard high-speed steel bits. A gold finish indicates the cobalt-enriched alloy blend. Straight shanks fit standard drill chucks, and the screw machine length profile provides added rigidity and control in drill presses and handheld power tools. The set covers sizes from 1/16 inch to 1/2 inch in 1/64-inch step increments, stored in a metal case.

This set is intended for trade professionals and industrial users working with steel, stainless, cast iron, and other hard materials. Screw machine length bits are shorter than jobber-length bits, making them the preferred choice in tight-clearance applications, production drilling, and CNC or drill press setups where flex and deflection need to be minimized. The 29-piece range covers the full fractional inch progression from 1/16 inch through 1/2 inch, making it suitable for general fabrication shops, maintenance mechanics, plumbers, and HVAC techs drilling through metal framing and hardware.

Key Features

• Cobalt (M40CO series) construction for extended life in hard and abrasive metals
• 135-degree split-point tip self-centers and reduces drill walking without a center punch
• Screw machine length profile increases rigidity and reduces deflection versus jobber-length bits
• Covers 1/16 inch to 1/2 inch in 1/64-inch step increments — 29 pieces total
• Straight shank fits standard three-jaw drill chucks
• Gold finish alloy-indicator coating; metal storage case included
• Meets ANSI specification standards

Compatibility

Designed for use with standard straight-shank drill chucks on drill presses, handheld power drills, and CNC equipment. Suitable for metalworking and multipurpose drilling applications per ANSI standards.

Installation Notes

Installation and use of this set is appropriate for machinists, maintenance mechanics, and trade professionals operating drill presses or power drills. Secure the workpiece before drilling and confirm the chuck is tightened fully around the straight shank before starting the tool. Use cutting fluid or coolant when drilling hard metals to extend bit life, even though coolant-through is not built into this bit design. Inspect each bit for wear or tip damage before use and replace any bit that shows cracking or excessive wear at the cutting edge.