Precision Twist Drill 5996506 Cobalt Screw Machine Drill Bit

Product Description

The PRECISION TWIST DRILL 5996506 is a cobalt screw machine length drill bit designed for high-performance drilling in hard and difficult-to-machine materials. Built to Series M42CO standards, it features a 135-degree split point for fast engagement and reduced walking on entry. The straight-cylindrical shank seats securely in standard drill chucks. At 0.295 inches in diameter with an overall length of 2.75 inches and a flute length of 1.5625 inches, this bit is proportioned for stub-length rigidity. Machinists, maintenance mechanics, and tool and die professionals reach for this type of bit when standard HSS tooling fails to hold an edge in alloy steels, stainless, and hardened stock.

This drill bit is suited for screw machine operations, drill press work, and CNC applications requiring a compact, rigid cutting tool. Its 2.5xD flute-to-diameter ratio and tapered web configuration support efficient chip evacuation in short-depth holes. The right-hand cut spiral flute is the standard orientation compatible with conventional drilling equipment. It is particularly useful in job shop and production environments where hard ferrous and non-ferrous alloys are common workpiece materials.

Key Features

• M42 cobalt construction for heat resistance and edge retention in hard materials
• 135-degree split point reduces thrust force and minimizes center-punch dependency
• Web-thinned, tapered web design promotes chip clearance and reduces torque
• Screw machine length provides extra rigidity over jobber-length bits in short-reach applications
• Right-hand spiral flute with 2.5xD ratio optimized for through-hole and shallow drilling
• Meets ANSI standards for dimensional accuracy and performance

Compatibility

Designed as a heavy-duty replacement or production-use bit for applications involving hard materials in the 0.2500 to 0.3000 inch diameter range, compatible with any standard straight-shank drill chuck or collet system.

Installation Notes

This drill bit is installed and replaced by machinists or maintenance mechanics using standard drill chuck keys or collet wrenches. Ensure the machine spindle is fully stopped and locked out before changing tooling. Use appropriate cutting fluid or coolant when drilling hard alloys to extend tool life, noting that this bit does not support through-coolant delivery. Confirm chuck runout is within acceptable tolerance before beginning a production run to avoid premature edge wear.