Precision Twist Drill 5999397 Screw Machine Drill Bit

Product Description

The PRECISION TWIST DRILL 5999397 is a screw machine length drill bit designed for high-performance drilling in demanding trade and industrial applications. Measuring 0.0625 inches (1/16 inch) in diameter with an overall length of 1.625 inches and a flute length of 0.625 inches, this bit is built for close-tolerance work where standard jobber-length bits are too long. Constructed from high speed steel with a coated finish, it features a 135-degree split point for fast engagement and reduced walking, and a web-thinned, tapered web configuration for lower thrust and cleaner entry. It cuts in a right-hand direction with a regular spiral flute pattern.

This drill bit is rated for high-performance applications and is well suited to titanium as its primary workpiece material, making it a practical choice for aerospace, mechanical, and precision fabrication work. The screw machine length profile — shorter than a standard jobber bit — provides added rigidity and reduced deflection in drill press, CNC, and turret lathe setups. The straight-cylindrical shank fits standard three-jaw chucks without adapters. It is sold individually but requires a minimum order of 12 units per the manufacturer's packaging policy.

Key Features

• 0.0625 inch (1/16 inch) diameter with screw machine length for increased rigidity
• 135-degree split point reduces walking and lowers required thrust force
• Web-thinned, tapered web for cleaner hole entry and reduced heat buildup
• High speed steel construction with coated finish for extended service life
• Right-hand cut with regular spiral flute; rated for titanium and other demanding materials
• Meets ANSI and NAS 907 standards; Series R40C heavy duty grade

Compatibility

Designed as an OEM-style replacement and standard fit for three-jaw drill chucks accepting straight-cylindrical shanks; rated for titanium as the primary workpiece material per Series R40C specifications.

Installation Notes

Install in a compatible drill chuck and verify the shank is fully seated and secured before operation. Power down or de-energize the machine tool completely before changing bits. Follow applicable ANSI machining safety standards and shop safety procedures when working with small-diameter bits, as they are susceptible to breakage under side load or excessive feed pressure. Coolant-through is not supported on this bit; use appropriate cutting fluid applied externally when drilling titanium or other hard materials.