Precision Twist Drill 5996529 Cobalt Screw Machine Drill Bit

Product Description

The PRECISION TWIST DRILL 5996529 is a cobalt screw machine length drill bit designed for high-performance drilling in hard and demanding workpiece materials. Built to ANSI standards and classified as M42 cobalt grade, it delivers the heat resistance and edge retention required when cutting hardened steels, stainless, and other tough alloys. The bit measures 0.348 inches in diameter (Letter Size S), with an overall length of 3-1/16 inches and a flute length of 1-3/4 inches. The 135-degree split point reduces walking and improves hole entry accuracy without a center punch. Installed by machinists and metal fabricators, this bit fits screw machine and turret lathe applications where short, rigid tooling is required.

This drill bit is suited for screw machine, turret lathe, and CNC drilling operations where a short flute-to-diameter ratio provides rigidity and reduces deflection. The 2.5xD flute-by-diameter ratio and web-thinned, tapered web configuration make it appropriate for production environments drilling hard materials. The straight-cylindrical shank accepts standard drill chucks across a range of machine types. It is a right-hand cut tool with a regular spiral and is not configured for coolant-through delivery, making it best suited for external flood or mist coolant setups.

Key Features

• M42 cobalt steel construction for heat resistance in hard material drilling
• 135-degree split point for fast engagement and reduced drill walk
• Web-thinned, tapered web reduces thrust load and improves chip evacuation
• Screw machine length (short series) provides rigidity in turret and CNC applications
• 2.5xD flute-by-diameter ratio balances chip clearance with tool stiffness
• ANSI-specification compliance for consistent sizing and interchangeability

Compatibility

Designed as an OEM-style replacement or direct-use tool in any drill chuck or collet accepting a straight-cylindrical shank in the 0.348-inch diameter range, consistent with ANSI-standard screw machine length drill bits in the Series M42CO heavy duty grade.

Installation Notes

A licensed machinist or qualified metalworker should install and operate this tooling in appropriate drilling equipment. Secure the straight-cylindrical shank fully in a drill chuck or collet before operation and verify runout before beginning production cuts. Use appropriate cutting fluid or external coolant, as this bit does not support coolant-through delivery. Inspect the cutting edges for wear regularly when drilling hard materials to maintain hole quality and prevent premature tool failure.