Precision Twist Drill 5999395 Screw Machine Drill Bit M

Product Description

The PRECISION TWIST DRILL 5999395 is a screw machine length drill bit designed for high-performance drilling in demanding shop and field applications. It measures 0.295 inches (Letter M) in diameter with an overall length of 2-3/4 inches and a flute length of 1-9/16 inches. Built from high speed steel with a coated finish, this bit features a 135-degree split point and web-thinned, tapered web construction that reduces thrust and improves chip evacuation. It carries a right-hand cut spiral flute and a straight-cylindrical shank. Machinists, toolroom technicians, and industrial maintenance mechanics working with titanium and other hard materials are the primary users of this series.

The R42C series is engineered for screw machine and short-hole drilling applications where a stub-length bit provides greater rigidity and accuracy than jobber-length alternatives. The 2.5xD flute-to-diameter ratio makes this bit well suited for precise, close-tolerance work in CNC screw machines, turret lathes, and drill presses. Its heavy duty grade and ANSI and NAS 907 compliance make it appropriate for aerospace, automotive, and general metalworking environments where dimensional consistency and bit integrity are critical.

Key Features

• 135-degree split point reduces walking and lowers required thrust at entry
• Web-thinned tapered web improves chip flow and reduces heat buildup
• High speed steel construction with coated finish extends tool life in abrasive materials including titanium
• Screw machine (stub) length provides added rigidity for tighter hole tolerances
• Straight-cylindrical shank fits standard drill chucks without adapters
• Meets ANSI and NAS 907 standards for dimensional and performance compliance

Compatibility

Designed as an OEM-style replacement or direct-use drill bit for screw machines, turret lathes, CNC machining centers, and drill presses requiring a 0.295-inch (Letter M) straight-shank stub-length bit. Primary workpiece material listed by the manufacturer is titanium; the high speed steel construction and coated finish also support use in steel, aluminum, and similar metals.

Installation Notes

Install the straight-cylindrical shank into a properly sized drill chuck and tighten securely before operation. Always power down and de-energize the machine before changing bits. Use appropriate cutting fluid or coolant for titanium and hard-metal applications to manage heat, noting that this bit does not have coolant-through capability. Inspect the split point and cutting edges before each use and replace the bit if chipping or edge wear is visible.