Accupro 4500428 Screw Machine Drill Bit 12mm Carbide

Product Description

The ACCUPRO 4500428 is a screw machine length drill bit designed for high-performance drilling in demanding materials. Built from solid carbide with a TiAlN coating, it delivers extended tool life and heat resistance in production and job-shop environments. The 12.00 mm diameter bit features a 140-degree split point with R-thinned web for improved centering and reduced thrust. Overall length is 102.00 mm with a 55.00 mm flute length, offering the short, rigid profile that screw machine and CNC applications require. Coolant-through capability supports chip evacuation and thermal management during deep or interrupted cuts. Weighing 0.17 pounds, it ships individually.

This drill bit is optimized for stainless steel as the primary workpiece material, where carbide substrate and TiAlN coating resist the work-hardening and galling common in austenitic grades. It is suited for use in CNC machining centers, screw machines, and turret lathes running at the higher surface speeds that solid carbide enables. The straight-cylindrical shank at 12.00 mm (0.4724 inch) fits standard collet chucks and drill chucks in that bore range. The 3xD flute-to-diameter ratio supports chip clearance at moderate depth-to-diameter ratios typical of through-hole and blind-hole operations in stainless and other ferrous alloys.

Key Features

• Solid carbide construction for rigidity and wear resistance in hard and abrasive materials
• TiAlN coating for high heat resistance and extended tool life at elevated cutting speeds
• 140-degree split point with R-thinned web reduces thrust and improves hole entry accuracy
• Coolant-through design supports chip flushing and heat control in deep drilling operations
• Straight-cylindrical shank for compatibility with standard collets and drill chucks
• Short screw machine length profile provides rigidity, reducing deflection in production setups

Compatibility

Designed as an OEM-style replacement or direct-fit drill bit for CNC machining centers and screw machines accepting a 12.00 mm straight-cylindrical shank, conforming to DIN specification standards.

Installation Notes

Installation and use should be performed by a qualified machinist or toolroom technician familiar with carbide tooling. Secure the shank fully in a properly sized collet or drill chuck before operation and verify runout is within acceptable limits for the application. Solid carbide tooling is brittle and susceptible to breakage from lateral load or interrupted cuts without proper setup. Always engage coolant flow before the tool contacts the workpiece when using the through-coolant feature.