Precision Twist Drill 5996023 Cobalt Screw Machine Drill Bit

Product Description

The PRECISION TWIST DRILL 5996023 is a cobalt screw machine length drill bit designed for drilling into hard materials where standard high-speed steel bits fall short. Built to the M41CO series specification, this bit measures 0.228 inches (Wire Size 1) in diameter with an overall length of 2-7/16 inches and a flute length of 1-5/16 inches. The 135-degree split point reduces walking on entry and lowers thrust requirements, while the web-thinned, tapered web construction improves chip clearance. Right-hand spiral flutes and a straight-cylindrical shank make this a drop-in fit for standard drill chucks and screw machine setups. This is a single-piece unit intended for trade and industrial use.

Screw machine length bits are the go-to choice when working in tight clearances or on CNC screw machines, turret lathes, and bench drill presses where a shorter overall length improves rigidity and reduces deflection. The cobalt construction of the 5996023 makes it well suited for drilling stainless steel, cast iron, hardened alloys, and other hard workpiece materials that generate significant heat at the cutting edge. Machinists, tool-and-die technicians, and maintenance professionals who regularly cycle through hard-material drilling applications will find this bit appropriate for production and repair work.

Key Features

• Cobalt (M41 material grade) construction handles elevated cutting temperatures in hard materials
• 135-degree split point reduces drill walking and lowers entry thrust
• Web-thinned, tapered web improves chip evacuation and reduces heat buildup
• Screw machine length (2-7/16 inches overall) provides added rigidity over jobber-length bits
• 2.5xD flute-to-diameter ratio balances chip clearance with core strength
• Straight-cylindrical shank fits standard 3-jaw drill chucks without adapters
• Meets ANSI standards for dimensional accuracy and performance

Compatibility

Designed as a heavy-duty screw machine length replacement bit for applications requiring a 0.228-inch (Wire Size 1) hole diameter in hard or abrasion-resistant workpiece materials. Fits any drill chuck or turret accepting a straight-cylindrical shank at this diameter.

Installation Notes

Secure the straight-cylindrical shank firmly in the drill chuck and verify runout before beginning a drilling cycle. Always apply cutting fluid or coolant-compatible lubricant when drilling hard materials to extend tool life and prevent premature edge breakdown. Ensure the workpiece is clamped or fixtured to prevent movement during drilling. Follow applicable shop safety standards and machine manufacturer guidelines for spindle speed and feed rate selection.