Osg 8690370 Solid Carbide Screw Machine Drill Bit 3.70mm

Product Description

The OSG 8690370 is a solid carbide screw machine length drill bit designed for high-performance drilling in demanding metalworking applications. It features a 3.70 mm diameter with a 140-degree R-thinned point that reduces thrust and improves centering on entry. The EgiAs coating provides enhanced wear resistance and heat protection during high-speed cutting. With an overall length of 74.00 mm and a flute length of 23.00 mm, this stub-length bit delivers rigidity and accuracy in short-reach drilling operations. It is installed by machinists, tool and die technicians, and precision metalworking professionals operating CNC and manual drill presses or machining centers.

This drill bit is suited for production drilling in steel, alloy steel, cast iron, titanium, and titanium alloys. Its screw machine length profile makes it a practical choice for high-cycle applications where tool runout and deflection must be minimized. The straight-cylindrical shank measures 4.00 mm in diameter, allowing straightforward chuck mounting in standard collets and drill chucks. Coolant-through capability supports deep-hole thermal management and chip evacuation when paired with appropriate toolholding and coolant delivery systems.

Key Features

• Solid carbide construction for rigidity and wear resistance in hard and abrasive materials
• EgiAs coating for extended tool life and reduced heat buildup at the cutting edge
• 140-degree R-thinned point reduces entry thrust and improves hole location accuracy
• Coolant-through design supports chip evacuation and thermal control in production drilling
• Tapered web with regular spiral flute geometry optimized for a 3xD flute-to-diameter ratio
• Straight-cylindrical 4.00 mm shank for direct chuck or collet mounting

Compatibility

Designed for use in CNC machining centers, drill presses, and manual machines equipped with standard collets or drill chucks accepting a 4.00 mm straight-cylindrical shank. Suitable for drilling steel, alloy steel, cast iron, titanium, and titanium alloys.

Installation Notes

Installation and tool changes should be performed by qualified machining personnel with the spindle fully stopped and machine power locked out. Ensure the shank is fully seated and the chuck or collet is properly torqued before operation. Verify coolant-through delivery is active before beginning high-feed or deep-hole cycles to prevent thermal damage to the cutting edge. Handle carbide tooling carefully to avoid chipping the flutes or point during setup.