Precision Twist Drill 5996172 Screw Machine Drill Bit

Product Description

The PRECISION TWIST DRILL 5996172 is a cobalt screw machine length drill bit designed for drilling into hard materials where standard high-speed steel bits fall short. It carries a 135-degree split point that reduces walking and requires less thrust to start a hole. The straight-cylindrical shank seats securely in standard drill chucks. At 2.25 inches overall length with a 1.1875-inch flute length, this short-body design provides added rigidity, making it well-suited for close-quarters work and high-cycle production drilling. Machinists, tool-and-die workers, and maintenance techs reach for this bit when working through alloy steels, stainless, and other hard workpiece materials.

This bit fits production machining environments, maintenance and repair operations, and general metal fabrication shops. The screw machine length format is a common choice for drill press work, CNC turret lathes, and manual lathes where a shorter bit reduces deflection and improves hole accuracy. The M41CO series is built to ANSI standards and is rated for heavy-duty, high-performance applications where tool life under aggressive feed rates matters.

Key Features

• Cobalt (M41 grade) construction handles hard and abrasive workpiece materials
• 135-degree split point reduces thrust and prevents bit walking on hard surfaces
• Web-thinned, tapered web configuration improves chip clearance and cutting efficiency
• Screw machine length body (2.25 inches overall) adds rigidity and reduces deflection
• Regular spiral flute with 2.5xD flute-to-diameter ratio promotes efficient chip evacuation
• Right-hand cut with straight-cylindrical shank for compatibility with standard drill chucks

Compatibility

Designed as an OEM-style replacement or direct-use bit for standard drill chucks accepting straight-cylindrical shanks in the 0.201-inch diameter range. Suitable for use in drill presses, CNC lathes, turret lathes, and hand drills configured for screw machine length tooling.

Installation Notes

A licensed machinist or qualified maintenance technician should secure the bit fully into the chuck, verifying runout before drilling. Ensure the workpiece is firmly fixtured before engaging the bit. Follow applicable shop safety standards and machine manufacturer guidelines for feed rate and spindle speed when drilling hard materials. Never use a dull or chipped cobalt bit on hard stock, as it increases the risk of bit breakage and workpiece damage.