Precision Twist Drill 5998688 No. 23 Hss Screw Machine Drill Bit

Product Description

The PRECISION TWIST DRILL 5998688 is a screw machine length drill bit designed for high-performance metal drilling in demanding trade and industrial applications. Built from high-speed steel (HSS) with a coated finish, this bit features a 135-degree split point that reduces walking on entry and lowers thrust requirements compared to standard 118-degree points. The web-thinned, tapered web construction improves chip evacuation and cutting efficiency. At 2-1/16 inches overall length, the stub-length format provides added rigidity over jobber-length alternatives, making it well suited for close-tolerance, high-cycle drilling operations.

This bit is rated for primary use in titanium workpieces and is appropriate for screw machine, CNC, and manual drill press setups where stub-length rigidity is required. The No. 23 wire gauge size corresponds to 0.1540 inch diameter. The straight-cylindrical shank seats cleanly in standard drill chucks and collets. This bit is specified to ANSI and NAS 907 standards, making it a fit for aerospace, precision machining, and general metalworking environments where dimensional accuracy and repeatable performance are required. Licensed machinists and tool-room technicians are the typical end users.

Key Features

• No. 23 wire gauge, 0.1540 inch diameter with matching straight-cylindrical shank diameter
• 135-degree split point reduces entry walking and cutting thrust
• Web-thinned, tapered web improves chip flow and reduces heat buildup
• High-speed steel construction with coated finish for extended tool life
• Screw machine (stub) length at 2-1/16 inches OAL provides superior rigidity over jobber-length bits
• Meets ANSI and NAS 907 standards; Series R41C heavy-duty grade

Compatibility

Designed for use in standard drill chucks and collets accepting a 0.1540 inch straight-cylindrical shank; rated for titanium as the primary workpiece material and suitable for general ferrous and non-ferrous metals in screw machine, CNC, and drill press applications.

Installation Notes

Installation and use should be performed by qualified machinists or toolroom technicians familiar with cutting tool safety practices. Secure the shank fully in the chuck or collet and verify runout before beginning a drilling cycle. Power down and de-energize the machine before changing bits. Do not exceed the recommended feed and speed range for the workpiece material; refer to the machine manufacturer and HSS tooling guidelines for operating parameters.