Precision Twist Drill 5998598 Screw Machine Drill Bit

Product Description

The PRECISION TWIST DRILL 5998598 is a screw machine length drill bit designed for high-performance drilling in tight, close-tolerance applications. Built from high speed steel with a coated finish, this bit features a 135-degree split point that reduces walking and requires no center punch on most materials. The web-thinned, tapered web construction reduces thrust and improves chip evacuation. At 0.086 inches in diameter (Wire Size 44) with a 1.75-inch overall length and a 0.75-inch flute length, this bit is optimized for stub-length drilling where rigidity and accuracy matter most. Licensed HVAC, plumbing, and general trade technicians, as well as machinist professionals, will recognize the R41C series as a heavy-duty workhorse for demanding production drilling.

This bit is rated for primary use in titanium workpieces and is built to ANSI and NAS 907 specifications, making it suitable for aerospace, industrial maintenance, and precision trade applications. The screw machine length profile provides extra rigidity compared to jobber-length bits, making it well suited for drill press work, CNC operations, and hand-held drilling in confined spaces where deflection and bit breakage are common concerns. The 2.5xD flute-to-diameter ratio supports effective chip clearing at this small diameter.

Key Features

• 135-degree split point reduces drill walking and lowers thrust requirements
• Web-thinned, tapered web construction improves chip evacuation and cutting efficiency
• High speed steel construction with coated finish extends tool life in demanding materials
• Screw machine length body provides increased rigidity and reduced deflection versus jobber-length bits
• Right-hand spiral flute with straight-cylindrical shank for standard chuck compatibility
• Meets ANSI and NAS 907 specifications for use in precision and aerospace-grade applications

Compatibility

Designed as a heavy-duty OEM-style replacement or production bit for applications requiring Wire Size 44 (0.086 inches) diameter drilling, rated for titanium as the primary workpiece material and compatible with any standard drill press, CNC spindle, or hand drill chuck accepting a straight-cylindrical shank at this diameter.

Installation Notes

Installation of this bit is performed by machinists, tool-and-die technicians, and trade professionals using standard drill chucks or collets. Ensure the chuck or collet is fully released before inserting the shank and tighten securely before operation. When drilling titanium or other high-strength materials, use appropriate cutting fluid and controlled feed rates to prevent heat buildup and premature bit failure. Inspect the cutting edge before each use and replace any bit showing signs of chipping or burning.