Osg HP243-1575 Screw Machine Drill Bit 4mm Carbide

Product Description

The OSG HP243-1575 is a screw machine length drill bit engineered for high-performance drilling in steel, alloy steel, and cast iron. It is constructed from solid carbide and features an EgiAs coating designed to extend tool life and improve chip evacuation under demanding cutting conditions. The 4.00 mm diameter bit runs at a 140-degree point angle with an R-thinned point geometry, which reduces thrust and improves centering at entry. Overall length is 66.00 mm (2.5984 inches) with a 24.00 mm flute length. The straight-cylindrical shank measures 6.00 mm in diameter. This bit is intended for use by machinists and tool-and-die professionals in production drilling environments.

The HP243-1575 fits screw machine length drilling applications where a compact, rigid drill is preferred over jobber or long-series lengths. The 3xD flute-to-diameter ratio and regular spiral flute configuration make it well suited for short-hole drilling in ferrous materials including steel, alloy steel, and cast iron. It is a right-hand cutting tool intended for use in CNC machining centers, drill presses, and manual or automatic screw machines. Coolant-through is not supported on this model. The tapered web configuration pairs with the R-thinned point to reduce walking and improve hole entry accuracy without a center drill in many setups.

Key Features

• Solid carbide construction for rigidity and wear resistance in ferrous materials
• EgiAs coating for extended tool life and improved cutting performance
• 140-degree point angle with R-thinned geometry reduces entry thrust and improves centering
• Screw machine length (3xD) design provides compact reach and high rigidity
• Straight-cylindrical shank at 6.00 mm diameter for standard collet and chuck compatibility
• Right-hand spiral flute with tapered web for efficient chip removal

Compatibility

The HP243-1575 is part of the OSG HP243 series and is sized for drilling steel, alloy steel, and cast iron workpieces. It falls within the 3.50 mm to 5.00 mm drill bit size range of the series and fits standard 6.00 mm straight-cylindrical shank tool holders.

Installation Notes

This bit is installed by machinists in collet chucks or drill chucks rated for the 6.00 mm shank diameter. Ensure the spindle and work holding are fully secured before operation and confirm RPM and feed rate are appropriate for solid carbide tooling in the target workpiece material. Do not exceed the tool's design parameters for depth-to-diameter ratio on a single pass. Inspect the cutting edges and coating condition before each use to avoid tool failure in hardened or abrasive workpiece materials.