Precision Twist Drill 5998613 Screw Machine Drill Bit

Product Description

The PRECISION TWIST DRILL 5998613 is a screw machine length drill bit engineered for high-performance drilling in demanding trade and industrial applications. Built from high speed steel (HSS) with a coated finish, it measures 0.18 inches in diameter with an overall length of 2-3/16 inches and a flute length of 1-1/8 inches. The 135-degree split point reduces walking on entry and lowers thrust force, making it well suited for hard and tough materials. The web-thinned, tapered web configuration improves chip evacuation and cutting efficiency. This is a right-hand cut bit with a straight-cylindrical shank and regular spiral flute geometry, classified Series R41C under ANSI and NAS 907 standards.

This bit is intended for use in screw machine operations and general-purpose production drilling where a shorter, more rigid bit length is required. Its primary listed workpiece material is titanium, though the HSS construction and split-point geometry make it appropriate for ferrous metals and other hard materials commonly encountered in mechanical, HVAC, plumbing, and electrical trades. The 2.5xD flute-to-diameter ratio keeps the bit rigid in short-reach setups. It is sold individually and is compatible with standard drill chucks and screw machine spindles accepting straight-cylindrical shanks.

Key Features

• 135-degree split point reduces drill walking and cutting thrust on hard materials
• Web-thinned tapered web improves chip clearance and reduces heat buildup
• High speed steel construction with coated finish for extended tool life
• Screw machine length provides added rigidity over jobber-length bits in tight setups
• Straight-cylindrical shank fits standard drill chucks and screw machine spindles
• Meets ANSI and NAS 907 specifications for dimensional and performance consistency

Compatibility

Designed as a direct-fit screw machine length drill bit for standard straight-shank drill chucks and screw machine spindles; compatible with any setup accepting a 0.18-inch straight-cylindrical shank. Rated for titanium and other hard ferrous workpiece materials per the Series R41C specification.

Installation Notes

Machinists and trade professionals should verify chuck capacity before installation and ensure the shank is fully seated and secured before operating. Always run at appropriate surface footage for the workpiece material and bit diameter; consult published HSS speed-and-feed charts for titanium and hard metals. Coolant-through is not supported on this bit, so adequate external cutting fluid or coolant application is recommended when drilling titanium or hardened materials. Inspect the cutting edges and split point for wear before each use and replace the bit when signs of dulling or chipping are present.