Accupro 4500386 Screw Machine Drill Bit 11/32 in Carbide

Product Description

The ACCUPRO 4500386 is a screw machine length drill bit designed for high-performance drilling in demanding industrial and trade applications. Built from solid carbide and coated with TiAlN (titanium aluminum nitride), it delivers excellent heat resistance and tool life in tough materials. The bit measures 11/32 inches (0.3438 inches) in diameter with an overall length of 3.937 inches and a flute length of 1.772 inches. The 140-degree split point promotes accurate entry and reduces walking on hard surfaces. Coolant-through capability supports high-speed production use. Licensed machinists, tool-and-die technicians, and maintenance trades install this bit for precision drilling tasks.

This bit is suited for drilling stainless steels and other hard metals in both production and job-site environments. The screw machine length (stub) format provides added rigidity compared to jobber-length bits, making it a preferred choice when working in confined spaces or on CNC machining centers, drill presses, and turret lathes. The 3xD flute-to-diameter ratio supports chip evacuation in deep-hole applications. The straight cylindrical shank fits standard drill chucks and collets without modification.

Key Features

• Solid carbide construction for extended tool life in hard and abrasive materials
• TiAlN coating provides heat resistance and reduces built-up edge in stainless steel
• 140-degree special point angle reduces thrust and improves hole entry accuracy
• R-thinned web reduces cutting resistance and improves chip flow
• Coolant-through design supports high-speed and high-feed rate drilling
• Straight cylindrical shank fits standard chucks and collets

Compatibility

Designed as a high-performance replacement-style screw machine drill bit for use in applications requiring a 0.3438-inch diameter solid carbide bit with a straight cylindrical shank. Primary workpiece material is stainless steels per manufacturer specification.

Installation Notes

Installation and use of this bit is typically performed by machinists, CNC operators, or maintenance trades using drill presses, lathes, or machining centers. Ensure the spindle and workpiece are fully secured before operation. Use appropriate cutting fluid or coolant, especially when drilling stainless steel, to prevent work hardening and premature tool wear. Inspect the bit for chipping or wear before each use, as carbide tools can fracture if operated in damaged condition.