Accupro 4500357 Screw Machine Drill Bit 39/64 in Carbide

Product Description

The ACCUPRO 4500357 is a screw machine length drill bit engineered for high-performance metal removal in demanding production environments. Built from solid carbide and coated with TiAlN, it delivers the heat resistance and edge retention required for drilling stainless steel and other tough alloys. The 140-degree web-thinned point reduces thrust force and improves self-centering at entry. With an overall length of 5.709 inches and a flute length of 3.051 inches, this bit fits standard drill chucks and CNC machining centers. Coolant-through design supports high-speed drilling cycles where heat management is critical. Licensed machinists and tool-and-die professionals are the primary installers.

This drill bit is suited for production drilling in stainless steels and similarly hard ferrous materials. The 3xD flute-to-diameter ratio makes it appropriate for moderate-depth holes where chip evacuation must stay controlled. Its straight cylindrical shank and 0.625-inch shank diameter seat securely in standard drill chucks and collet holders. Typical applications include machine shops, maintenance facilities, and fabrication operations running CNC mills, drill presses, or machining centers that require repeatable, tight-tolerance hole quality in corrosion-resistant stock.

Key Features

• Solid carbide construction for maximum rigidity and wear resistance in hard materials
• TiAlN coating extends tool life by resisting heat buildup at high cutting speeds
• 140-degree web-thinned point reduces entry thrust and improves centering accuracy
• Coolant-through design aids chip evacuation and thermal control during deep drilling cycles
• Regular spiral, 2-flute geometry optimized for stainless steel and difficult-to-machine alloys
• Straight cylindrical shank compatible with standard drill chucks and collet systems

Compatibility

Designed as a high-performance OEM-style screw machine drill bit suitable for use in CNC machining centers, drill presses, and similar equipment accepting a straight cylindrical shank with a 0.625-inch shank diameter. Primary workpiece material designation is stainless steels per the series ASSC140-TA-CL specification.

Installation Notes

Installation and operation should be performed by qualified machinists familiar with cutting tool setup and machine tool operation. Verify spindle speed and feed rate against manufacturer guidelines for solid carbide tooling before use. Secure the shank fully in the chuck or collet and confirm runout is within acceptable limits before starting the cut. Always wear appropriate PPE and follow machine guarding requirements when operating rotating cutting tools.