Accupro 4500439 Screw Machine Drill Bit 0.4134 in Carbide

Product Description

The ACCUPRO 4500439 is a screw machine length drill bit designed for high-performance drilling in demanding shop and field applications. Built from solid carbide with a TiAlN coating, it delivers superior hardness and heat resistance compared to standard HSS tooling. The bit measures 10.50 mm (0.4134 inches) in diameter with a 140-degree drill point angle, a right-hand spiral flute configuration, and a straight-cylindrical shank with a 12.00 mm shank diameter. Coolant-through capability supports chip evacuation and thermal management during deep-hole operations. This bit is suited for machinists and tool-and-die professionals working in production or prototype environments.

This drill bit is optimized for cutting stainless steels, where tool life and edge stability are critical. The short screw machine length body improves rigidity and reduces deflection in CNC machining centers, drill presses, and manual mills. The R-thinned web reduces thrust force at entry, making it well suited for interrupted cuts and precision through-hole work. It covers a drill bit size range of 0.4000 to 0.4500 decimal inches (9.50 to 11.00 mm) and conforms to DIN specification. This is a single-bit package intended for professional use.

Key Features

• Solid carbide construction for maximum rigidity and extended tool life in hard materials
• TiAlN coating provides heat and oxidation resistance for high-speed dry or wet cutting
• 140-degree split point angle reduces walking and improves hole location accuracy
• Coolant-through design supports internal coolant delivery for deep-hole chip evacuation
• R-thinned web reduces axial thrust and entry force on tough workpiece materials
• DIN specification designation ensures dimensional conformance to recognized standards

Compatibility

Rated for use in stainless steels as the primary workpiece material. Straight-cylindrical shank is compatible with standard drill chucks and collet holders accepting a 12.00 mm shank diameter.

Installation Notes

Installation and use of this drill bit should be performed by qualified machinists or tool operators familiar with carbide tooling. Ensure the spindle and tool holder are clean and properly secured before operation to prevent runout, which can fracture carbide. Do not use this bit in hand-held drilling applications. Verify coolant delivery is operational before engaging coolant-through capability to avoid thermal shock to the carbide substrate.