Precision Twist Drill 5999315 Screw Machine Drill Bit

Product Description

The PRECISION TWIST DRILL 5999315 is a screw machine length drill bit designed for high-performance drilling in metal fabrication, machining, and maintenance applications. Built from high speed steel (HSS) with a bright, uncoated finish, this bit measures 0.1015 inches in diameter and corresponds to wire gauge size 38. It features a 118-degree standard point angle, a right-hand spiral flute, and a straight-cylindrical shank for secure chuck engagement. The shortened screw machine length body provides increased rigidity compared to jobber-length bits, reducing deflection in tight workspaces and on drill press setups. Web thinning reduces cutting resistance at the point, improving penetration efficiency in harder stock including titanium.

This bit is well suited for use in machine shops, maintenance facilities, and production environments where close-tolerance holes are required in metal workpieces. The R41 series designation places it in the general-purpose high performance category, appropriate for drilling titanium and other metals where rigidity and point geometry are critical. It is sold individually with a minimum order quantity of 12 units, making it practical for shop stocking or toolroom replenishment. Machinists and tool-and-die technicians are the primary users in typical production or MRO settings.

Key Features

• Screw machine length body provides added rigidity and reduced deflection versus jobber-length bits
• 118-degree standard point angle with web thinning for reduced thrust and cleaner entry
• High speed steel construction rated for general-purpose and high-performance metal drilling including titanium
• Right-hand cut with regular spiral flute for efficient chip evacuation
• Straight-cylindrical shank compatible with standard drill chucks and collets
• Bright, uncoated finish allows easy visual inspection for wear and re-sharpening

Compatibility

Designed as an OEM-style replacement and standard toolroom drill bit for screw machine and drill press applications requiring a wire size 38 (0.1015-inch diameter) straight-shank bit conforming to ANSI standards.

Installation Notes

Installation and use should be performed by qualified machinists or maintenance technicians familiar with rotating cutting tools. Secure the straight-cylindrical shank firmly in a keyed or keyless chuck before operation, and verify the drill press or machine is powered down and locked out before changing bits. Use appropriate cutting fluid or coolant as recommended for the workpiece material to extend tool life. Inspect the cutting edges and web for wear before each use and resharpen or replace as needed to maintain hole quality.