Precision Twist Drill 5999357 Screw Machine Drill Bit

Product Description

The PRECISION TWIST DRILL 5999357 is a screw machine length drill bit engineered for high-performance drilling in tight, close-tolerance applications. Built from high speed steel (HSS) with a bright/uncoated finish, this bit features a standard 118-degree point angle and a right-hand spiral flute for efficient chip evacuation. The web-thinned, tapered web construction reduces thrust and improves penetration, particularly in harder workpiece materials. At 0.0995 inches in diameter with an overall length of 1-13/16 inches and a flute length of 13/16 inches, it is sized for work where a stub-length drill outperforms jobber-length alternatives. Meets ANSI standards and is rated for general-purpose grade use across a range of materials.

This bit is suited for machine shop, production drilling, and field applications where screw machine length geometry is required for rigidity and accuracy in shallow-to-moderate depth holes. The straight-cylindrical shank seats securely in standard drill chucks and quick-change holders. Its primary workpiece material rating includes titanium, making it appropriate for aerospace, automotive, and mechanical assembly tasks where harder alloys are encountered. Trade professionals including machinists, pipefitters, and maintenance mechanics will find this bit well suited to repetitive, precision hole work in confined setups.

Key Features

• 0.0995-inch diameter, Wire Size #39 designation for precise hole sizing
• High speed steel construction for durability across ferrous and non-ferrous materials
• 118-degree standard point angle with web-thinned, tapered web for reduced thrust
• Right-hand cut with regular spiral flute for controlled chip removal
• Screw machine (stub) length at 1-13/16 inches overall for added rigidity
• Bright/uncoated finish; ANSI-compliant Series R41

Compatibility

Designed as a screw machine length replacement or production drill bit for use in standard drill chucks and quick-change holders accepting straight-cylindrical shanks; rated for drilling titanium and general-purpose workpiece materials per Series R41 specifications.

Installation Notes

Installation is performed by machinists or maintenance trades using a compatible drill press, CNC machine, or handheld drill with an appropriate chuck size. Secure the straight-cylindrical shank fully in the chuck before operation to prevent runout or slippage. Ensure the workpiece is firmly fixtured and apply appropriate cutting fluid when drilling harder alloys such as titanium to extend tool life. Inspect the drill point for wear or chipping before each use in production applications.