Precision Twist Drill 5998935 Screw Machine Drill Bit

Product Description

The PRECISION TWIST DRILL 5998935 is a screw machine length drill bit designed for high-performance metal drilling applications. Built from high speed steel with a bright uncoated finish, this bit features a 118-degree standard point angle, a right-hand spiral flute, and a straight-cylindrical shank. It measures 0.281 inches (9/32 inch) in diameter with an overall length of 2-11/16 inches and a flute length of 1-1/2 inches. The web-thinned, tapered web construction reduces thrust during entry and improves chip evacuation. This bit is part of the Series R42 line and conforms to ANSI standards, making it a reliable option for precision hole-making in production and maintenance environments.

This screw machine length drill bit is rated for use on titanium as its primary workpiece material, which also makes it well suited for other ferrous and non-ferrous metals in general-purpose drilling operations. The shorter overall length relative to a jobber bit improves rigidity and reduces deflection, which is especially useful in drill press and screw machine setups where hole location accuracy matters. It is appropriate for use in machine shop, maintenance, HVAC, and plumbing fabrication settings where controlled, repeatable hole sizes are required.

Key Features

• 0.281 inch (9/32 inch) diameter, also designated drill bit size K in letter sizing
• 118-degree standard point angle with web-thinned, tapered web for reduced entry thrust
• High speed steel construction rated for titanium and general-purpose metal drilling
• Bright uncoated finish suitable for use with cutting fluids or dry
• Screw machine length body improves rigidity and reduces deflection versus jobber length
• Right-hand spiral flute with 2.5xD flute-to-diameter ratio for efficient chip removal
• Conforms to ANSI standards, Series R42

Compatibility

Designed as a general-purpose OEM-style replacement or direct-use screw machine drill bit for standard straight-shank drill chucks and screw machine setups accepting 0.281 inch diameter bits within the 0.2500 to 0.3000 inch drill bit size range.

Installation Notes

This bit is installed by machinists and trade professionals in drill presses, screw machines, or hand-held power drills equipped with a compatible straight-shank chuck. Ensure the workpiece is secured before drilling and that the chuck is tightened fully to prevent bit slippage. When drilling titanium or hard metals, use an appropriate cutting fluid and reduce feed pressure to extend bit life and maintain hole accuracy. Inspect the cutting edges for wear before each use and replace the bit if the point shows chipping or dulling.