Precision Twist Drill 5995944 Cobalt Screw Machine Drill Bit

Product Description

The PRECISION TWIST DRILL 5995944 is a cobalt screw machine length drill bit engineered for drilling hard and abrasion-resistant materials. It features a 135-degree split point that self-centers on contact and reduces thrust, allowing cleaner entry without a center punch. The web-thinned, tapered web construction improves chip evacuation during deep-hole drilling. At 23/32 inch (0.7188 inches) in diameter with a straight-cylindrical shank, this bit fits standard drill chucks and is built for heavy-duty production environments where tool life and hole quality matter.

This bit is suited for metal fabrication shops, machine shops, and maintenance applications where drilling into hard ferrous and non-ferrous materials is routine. The M40CO series cobalt construction allows it to handle elevated heat generated when cutting tough alloys and hardened steels. The screw machine length profile — shorter than jobber length — provides greater rigidity and reduced deflection, making it a reliable choice for use in drill presses, CNC turret lathes, and screw machine setups where axial rigidity is critical.

Key Features

• Cobalt tool material rated for hard and high-temperature workpiece materials
• 135-degree split point for self-centering entry and reduced thrust load
• Web-thinned tapered web for improved chip flow and reduced walking
• Screw machine length (shorter body) provides enhanced rigidity over jobber-length bits
• Right-hand cut with regular spiral flute, 2.5xD flute-to-diameter ratio
• Straight-cylindrical shank compatible with standard drill chucks and collets
• Meets ANSI standards; M40 material grade for heavy-duty performance

Compatibility

Designed for use in drill presses, screw machines, turret lathes, and CNC machining centers accepting a straight-cylindrical shank in the 23/32 inch size range. Intended for drilling hard materials including hardened steels, stainless, and tough alloys per the M40CO series designation.

Installation Notes

This bit should be installed by a qualified machinist or tool-and-die professional familiar with speeds and feeds for cobalt tooling in hard materials. Secure the shank fully in the chuck or collet before operation, and confirm runout is within acceptable tolerance to avoid premature edge wear. Always power down and lock out the machine before changing tooling. Use appropriate cutting fluid or coolant at the workpiece to manage heat, even though this bit does not support through-coolant delivery.