Osg HP243-4016 Screw Machine Drill Bit 10.20mm Carbide

Product Description

The OSG HP243-4016 is a solid carbide screw machine length drill bit designed for high-performance drilling in steel and cast iron. The bit measures 10.20 mm in diameter with a 140-degree R-thinned point that reduces thrust and improves centering on entry. A multi-layer EgiAs proprietary coating provides heat resistance and extends tool life in demanding production environments. Overall length is 102.00 mm (4.0157 inches) with a 55.00 mm flute length and a 12.00 mm straight cylindrical shank. This bit is suited for machinists, tool and die technicians, and production floor operators running CNC or manual drilling operations.

The HP243-4016 is built for drilling steel and cast iron in screw machine and short-hole applications. The 3xD flute-to-diameter ratio keeps the bit rigid in tight-tolerance work. The R-thinned web and tapered web configuration reduce walking and improve chip evacuation. Regular spiral flutes with a right-hand cutting direction make this bit compatible with standard drill press and CNC machining center setups. Drill bit diameter tolerance is held to +0.007 to +0.025 mm, placing it in the 0.4000 to 0.4500 decimal inch size range. No coolant-through capability is present, so external coolant or cutting fluid application is recommended for production runs.

Key Features

• Solid carbide construction for rigidity and wear resistance in ferrous materials
• Multi-layer EgiAs coating reduces friction and extends tool life in steel and cast iron
• 140-degree R-thinned point reduces entry thrust and improves hole location accuracy
• Tapered web with R-thinning improves chip flow and reduces heat buildup
• Straight cylindrical shank at 12.00 mm fits standard drill chucks and collet holders
• Tight diameter tolerance of +0.007 to +0.025 mm for consistent hole sizing

Compatibility

Designed as an OEM-style replacement and production drill for screw machine length drilling applications in steel and cast iron. Part of the OSG HP243 series targeting the 9.50 to 11.00 mm diameter range with high-performance carbide tooling.

Installation Notes

Installation and use should be performed by qualified machinists or tooling technicians familiar with carbide cutting tools. Secure the shank fully in a collet, drill chuck, or toolholder rated for the 12.00 mm shank diameter before operating. Power down and lock out the machine before changing or inspecting the bit. Carbide is brittle — avoid side loading, impact, or dropping the bit, as chipping or fracture can occur.