Osg 660031217 5/16 in Solid Carbide Screw Machine Drill Bit

Product Description

The OSG 660031217 is a screw machine length drill bit built for high-performance drilling in demanding materials. Manufactured from solid carbide, it features a 5/16 inch (0.3126 inch decimal) cutting diameter, a 140-degree point angle with R thinning, and three spiral flutes for efficient chip evacuation. The through-coolant capability supports high-speed machining operations where heat buildup is a concern. At 94.00 millimeters overall length with a 40.00 millimeter flute length, this stub-length bit delivers rigidity and reduced deflection in short-reach drilling applications. It is suited for machinists and tooling professionals working in production or maintenance environments.

This drill bit is designed for cutting steel, stainless steel, hard materials, and cast iron. The stub-length screw machine format makes it a preferred choice for CNC machining centers, turret lathes, and drill presses where minimal overhang reduces chatter and improves hole accuracy. The straight-cylindrical shank fits standard ER collets and drill chucks. The coated finish extends tool life in abrasive and high-hardness workpiece applications. Series 6600 is OSGs designation for this high-performance carbide stub drill line.

Key Features

• Solid carbide construction for rigidity and heat resistance in hard-material drilling
• 140-degree point angle with R thinning reduces thrust force and improves centering
• Three spiral flutes with tapered web configuration for efficient chip removal
• Through-coolant capable for high-speed or deep-hole drilling cycles
• Straight-cylindrical shank compatible with standard collets and drill chucks
• Diameter tolerance of +0 to -0.0009 inches for consistent hole sizing

Compatibility

Designed for use in steel, stainless steel, hard materials, and cast iron workpieces. Fits standard straight-shank toolholders, ER collets, and drill chucks compatible with a 5/16 inch shank diameter.

Installation Notes

Installation and use should be performed by qualified machinists or tooling technicians familiar with carbide cutting tool handling. Ensure the spindle and toolholder are fully powered down and locked out before changing tooling. Carbide is brittle — avoid side loads, interrupted cuts without proper feed rate adjustments, or dropping the tool on hard surfaces. Verify coolant flow is active before engaging through-coolant drilling cycles.