Precision Twist Drill 5996162 Cobalt Screw Machine Drill Bit

Product Description

The PRECISION TWIST DRILL 5996162 is a cobalt screw machine length drill bit designed for drilling into hard and abrasive materials in high-cycle production and maintenance environments. Sized at 0.042 inches (Wire Size 58) with an overall length of 1.375 inches and a flute length of 0.5 inches, this bit fits compact drilling heads and close-tolerance fixtures common in screw machine and light machining work. The 135-degree split point and web-thinned, tapered web geometry reduce thrust load and improve centering on entry without a center punch. It is manufactured to ANSI standards in the M41 cobalt HSS grade, providing heat and wear resistance beyond standard high-speed steel.

This drill bit is suited for use in screw machine operations, CNC drilling centers, drill presses, and handheld power tools where a short, rigid bit is required to minimize deflection. The M41CO series targets hard materials including hardened steels, stainless alloys, and tough workpieces that generate significant heat at the cutting edge. It is typically used by machinists, tool and die technicians, and maintenance mechanics who require consistent hole quality at small diameters across repeated operations.

Key Features

• M41 cobalt HSS construction resists heat buildup when cutting hard and abrasive materials
• 135-degree standard split point with web thinning reduces entry thrust and self-centers without spotting
• Screw machine length body (1.375 inches overall) provides rigidity and minimizes deflection at small diameters
• Right-hand spiral flute with regular helix evacuates chips efficiently in through-hole and blind-hole applications
• Straight-cylindrical shank fits standard drill chucks without adapters
• Meets ANSI standards for geometry and dimensional tolerances; rated heavy duty for high-performance applications

Compatibility

Designed as an OEM-style replacement and standard production drill bit for use in any ANSI-compatible drill chuck or collet accepting a straight-cylindrical shank at 0.042 inch diameter.

Installation Notes

This bit is installed by a machinist or qualified technician using a standard drill chuck sized for small-diameter straight shanks. Ensure the workpiece is securely clamped and the drill is running at an appropriate surface footage for the workpiece material before engaging the cut. Coolant or cutting fluid is recommended when drilling hard alloys, even though this bit does not have through-coolant capability. Inspect the cutting edges for wear regularly, as small-diameter cobalt bits are sensitive to side loading and should not be forced off-axis.