Precision Twist Drill 5998563 Screw Machine Drill Bit

Product Description

The PRECISION TWIST DRILL 5998563 is a screw machine length drill bit designed for high-performance drilling in demanding trade and industrial applications. Built from high speed steel with a coated finish, this bit features a 135-degree split point and web-thinned, tapered web construction that reduces walking on entry and lowers thrust requirements. At 0.11 inches (7/64 inch, wire size 35) in diameter with an overall length of 1-7/8 inches and a flute length of 7/8 inch, it fits compact drilling tasks where standard-length bits are too long. Licensed tradespeople and machinists working in tight clearance environments will find the shorter body length particularly useful.

This bit is engineered for use on titanium as its primary workpiece material, making it appropriate for aerospace, precision fabrication, and specialty mechanical work where material hardness demands a high-performance cutting tool. The screw machine (stub) length format is common in CNC turret operations, drill presses, and hand-held power tools where spindle clearance is limited. The straight-cylindrical shank seats reliably in standard drill chucks across a wide range of equipment.

Key Features

• 7/64 inch diameter (0.1100 inches decimal, wire size 35) covers the 0.1000 to 0.1500 inch size range tier
• 135-degree split point with web thinning reduces entry thrust and minimizes bit walking
• High speed steel construction with coated finish extends tool life in hard-material applications
• Screw machine (stub) length at 1-7/8 inches overall suits tight clearance and turret setups
• Regular spiral flute at 2.5xD flute-to-diameter ratio promotes efficient chip evacuation
• Meets ANSI and NAS 907 standards; Series R41C heavy duty grade

Compatibility

Designed as an OEM-style replacement and standard-production drill bit for use in straight-chuck drill presses, CNC turret machines, and hand-held power tools accepting straight-cylindrical shanks; primary workpiece material rating is titanium per supplier specifications.

Installation Notes

Installation and use should be performed by qualified machinists or tradespeople familiar with drill bit selection and machine operation. Secure the straight-cylindrical shank fully in the drill chuck before operation and verify chuck key is removed before powering the machine. Use appropriate cutting fluid or coolant for titanium and other hard materials to manage heat buildup, as this bit does not support through-coolant delivery. Follow applicable ANSI safety standards and shop safety protocols when operating drilling equipment.