Precision Twist Drill 5998523 5/16 in Hss Drill Bit

Product Description

The PRECISION TWIST DRILL 5998523 is a screw machine length drill bit designed for high-performance drilling in metalworking and machining applications. Built from high speed steel (HSS) with a bright, uncoated finish, this bit measures 5/16 inch (0.3125 inches) in diameter with an overall length of 2-13/16 inches and a flute length of 1-5/8 inches. The 118-degree standard point angle and web-thinned, tapered web configuration reduce entry force and improve chip evacuation. Machinists, tool-and-die professionals, and fabricators install this bit in drill presses, CNC machines, and screw machines where a shorter, more rigid bit is needed for accurate hole placement.

This screw machine length bit is suited for production drilling in tight setups where a jobber-length bit would introduce deflection or chatter. Its 2.5xD flute-to-diameter ratio and right-hand spiral flute geometry make it particularly effective in ferrous and non-ferrous metals. The primary workpiece material listed is titanium, indicating the bit is built to handle demanding, work-hardening materials in addition to general-purpose stock. It conforms to ANSI standards and carries a Series R40 designation from Precision Twist Drill.

Key Features

• 5/16 inch (0.3125 inches) diameter with screw machine length for rigid, low-deflection drilling
• High speed steel construction for durability in metal cutting applications
• 118-degree standard point angle with web-thinned, tapered web for reduced thrust and clean entry
• Right-hand cut with regular spiral flute for consistent chip removal
• Straight-cylindrical shank fits standard drill chucks without adapters
• Conforms to ANSI standards; Series R40 designation

Compatibility

Designed as a general-purpose screw machine length replacement bit compatible with standard straight-shank drill chucks on drill presses, screw machines, and CNC drilling equipment handling stock in the 0.3000 to 0.3500 inch diameter range.

Installation Notes

Installation is performed by machinists or tool operators. Secure the straight-cylindrical shank fully in a keyed or keyless chuck before operation and verify chuck runout is within acceptable tolerance before drilling titanium or other work-hardening materials. Always wear appropriate eye and face protection when operating drilling equipment. Inspect the cutting edges and web prior to each use; replace bits that show chipping, heat discoloration, or dulling to avoid workpiece damage.