Accupro 77712594 Screw Machine Drill Bit 0.125in Carbide

Product Description

The ACCUPRO 77712594 is a screw machine length drill bit designed for high-performance drilling in demanding metalworking applications. Built from submicron solid carbide and coated with AlTiN (aluminum titanium nitride), this bit handles elevated cutting temperatures and abrasive materials without premature wear. The 0.125 inch (1/8 inch) diameter, 140-degree split-point geometry, and web-thinned parallel web reduce thrust forces on entry, making it well suited for production drilling where precision and tool life are critical. A coolant-through design supports internal coolant delivery for deeper cuts and chip evacuation.

This bit is intended for machining alloy steel, cast iron, and stainless steel in screw machine, CNC drilling, and general metalworking operations. The screw machine (stub) length format provides added rigidity compared to jobber-length bits, reducing deflection in tight setups or short-reach fixtures. It is typically used by machinists, toolroom technicians, and CNC operators working with ferrous metals and hard alloys where standard HSS tooling falls short.

Key Features

• Submicron solid carbide construction for extended tool life in hard and abrasive metals
• AlTiN coating provides heat resistance and reduced friction at high cutting speeds
• 140-degree standard point with web thinning reduces entry thrust and improves centering
• Coolant-through design supports internal coolant or air delivery for chip evacuation
• Right-hand cut, regular spiral flute with straight-cylindrical shank for standard chuck compatibility
• Diameter tolerance held to +0.0000 to -0.0005 inches for close-tolerance hole production

Compatibility

Designed for use in alloy steel, cast iron, and stainless steel workpieces. Straight-cylindrical shank fits standard drill chucks and collet holders accepting 3 mm (approximately 0.118 inch) shank diameters.

Installation Notes

Installation and tool changes should be performed with the machine fully powered off and the spindle at a complete stop. Secure the straight-cylindrical shank in a properly sized collet or drill chuck and verify runout before starting a production run. Coolant-through capability should be matched to machine spindle coolant delivery pressure for optimal chip evacuation. Follow shop safety protocols and machine manufacturer guidelines when setting speeds and feeds for carbide tooling in ferrous materials.