Osg HP243-1732 Screw Machine Drill Bit 4.40mm Carbide

Product Description

The OSG HP243-1732 is a solid carbide screw machine length drill bit designed for high-performance drilling in steel and cast iron. It features a 4.40 mm (0.1732 inch) diameter with a 140-degree point angle and an R-thinned point geometry that reduces thrust and improves centering at entry. The proprietary EgiAs multi-layer coating provides heat and wear resistance for extended tool life in demanding production environments. At 66.00 mm (2.5984 inches) overall length, this stub-length bit delivers added rigidity compared to jobber-length drills, making it well-suited for CNC machining centers and automated drilling operations where runout control is critical.

This drill bit is intended for use on ferrous workpiece materials including steel and cast iron. The screw machine length format is a common choice for short-hole drilling on turret lathes, screw machines, and CNC machining centers where a shorter flute length improves stability. The 3xD flute-to-diameter ratio and 6.00 mm (0.2362 inch) straight cylindrical shank allow it to seat securely in standard drill chucks and collet holders used in production machine shops and toolrooms.

Key Features

• Solid carbide construction for rigidity and wear resistance in ferrous materials
• EgiAs proprietary multi-layer coating for extended tool life under high cutting speeds
• 140-degree point angle with R-thinned web reduces entry thrust and improves hole accuracy
• Screw machine (stub) length at 66.00 mm OAL provides enhanced rigidity over jobber-length bits
• 3xD flute-to-diameter ratio suits short-hole production drilling applications
• Right-hand cutting, regular spiral flute with tapered web configuration

Compatibility

Designed as an OEM-style replacement or direct-use tooling solution for production drilling applications in steel and cast iron; fits standard drill chucks and collet holders accepting a 6.00 mm straight cylindrical shank.

Installation Notes

Installation and use of carbide drill bits should be performed by qualified machinists or CNC setup technicians familiar with cutting tool parameters. Ensure the shank is fully seated and clamped securely in the tool holder before operation to prevent runout damage. Solid carbide tooling is brittle — avoid side loading or interrupted cuts without confirming the application is within the tool's rated parameters. Machine spindle speed and feed rate should be set according to the workpiece material and shop-specific cutting data before the first hole.