Accupro 4500355 Screw Machine Drill Bit 33/64 Carbide Tialn

Product Description

The ACCUPRO 4500355 is a screw machine length drill bit designed for high-performance drilling in demanding production environments. Built from solid carbide and coated with TiAlN (titanium aluminum nitride), this bit handles the heat and abrasion that come with cutting stainless steel and other difficult materials. It measures 33/64 inch (0.5156 inches) in diameter with an overall length of 5.276 inches and a flute length of 2.657 inches. The 140-degree split point and R-thinned web reduce entry force and improve centering without a pilot hole. Licensed machinists, tool-and-die techs, and industrial maintenance professionals are the primary users.

This drill bit is rated for primary use in stainless steels, where its TiAlN coating resists oxidation at elevated cutting temperatures. The 3xD flute-to-diameter ratio and regular spiral flute geometry suit it for short-hole drilling on CNC machining centers, drill presses, and screw machines. Coolant-through capability allows internal coolant delivery directly to the cutting edge, supporting extended tool life in high-cycle production runs. The straight-cylindrical shank seats in standard drill chucks and collet holders without modification.

Key Features

• Solid carbide construction for rigidity and wear resistance in hard materials
• TiAlN coating extends tool life under high-temperature cutting conditions
• 140-degree special point angle with R-thinned web for reduced thrust and accurate entry
• Coolant-through design delivers coolant directly to the cutting zone
• 2-flute spiral geometry with 3xD flute ratio optimized for short-hole applications
• Straight-cylindrical shank fits standard chucks and ER collet systems

Compatibility

Designed as a high-performance screw machine length drill bit for use in stainless steels, sized in the 0.5000 to 0.6000 inch diameter range, and compatible with any machine spindle or chuck accepting a straight-cylindrical shank of 0.5156 inches diameter.

Installation Notes

Installation and use should be performed by qualified machinists or tool operators familiar with carbide tooling. Ensure the spindle and chuck or collet are clean and undamaged before seating the shank. Carbide is brittle compared to high-speed steel — avoid side loading, interrupted cuts without proper feed compensation, or dropping the bit on hard surfaces. When using coolant-through capability, verify that coolant lines are clear and pressure is within the machine specification before starting the cut.