Osg HP243-3189 Screw Machine Drill Bit 8.1mm Carbide

Product Description

The OSG HP243-3189 is a screw machine length drill bit designed for high-performance drilling in metal, alloy, and hard material applications. Built from solid carbide, it delivers rigidity and wear resistance that high-speed steel bits cannot match in demanding production environments. The 140-degree split point geometry reduces thrust, minimizes walking on entry, and improves hole accuracy without a center punch. An R-thinned web further reduces cutting resistance at the chisel edge. At 8.1 mm in diameter with a 47 mm flute length and 89 mm overall length, this bit is sized for screw machine and CNC drilling setups where compact tool length reduces deflection and runout.

This drill bit is suited for machinists, tool and die shops, and production drilling operations using screw machines, CNC machining centers, or manual drill presses with rigid setups. The WD1 coating improves surface hardness and lubricity, extending tool life in ferrous and non-ferrous materials. The 10 mm shank diameter fits standard collets and chucks common in production machine tooling. The 3xD flute-to-diameter ratio supports chip evacuation in moderate-depth holes without coolant-through capability.

Key Features

• Solid carbide construction for high rigidity and extended tool life in hard materials
• 140-degree split point reduces entry thrust and eliminates the need for center punching
• WD1 coating improves wear resistance and surface lubricity
• R-thinned web lowers cutting force at the chisel edge
• Screw machine length profile minimizes deflection in rigid machine setups
• 3xD flute ratio supports efficient chip evacuation in moderate-depth holes

Compatibility

Designed as a production-grade screw machine length drill bit in the OSG HP243 series, compatible with standard collets and drill chucks accepting a 10 mm shank in CNC machining centers, turret lathes, and screw machines.

Installation Notes

Installation and tool changes should be performed with the machine powered off and spindle fully stopped. Secure the 10 mm shank in a properly sized collet or drill chuck and verify runout before production drilling. Machinists should follow shop-standard speeds and feeds for solid carbide tooling based on workpiece material. No coolant-through capability is present on this bit; apply external coolant or cutting fluid as required by the application.