Osg 61643 Screw Machine Drill Bit 9/16 Inch Tin Hss

Product Description

The OSG 61643 is a screw machine length drill bit designed for high-performance drilling in steel, stainless steel, aluminum, and other non-ferrous materials. Built from vanadium high-speed steel with a titanium nitride (TiN) coating, it delivers extended tool life and reduced friction in demanding production environments. The 120-degree, 4-facet point geometry with web thinning promotes accurate self-centering and clean entry without a pilot hole. At 4.5669 inches overall length, this compact stub-style bit is suited for CNC machining centers, drill presses, and screw machine applications where rigidity and chip control are critical. Installation and operation are performed by machinists and tool-and-die professionals.

The OSG 61643 fits applications involving ferrous and non-ferrous workpieces in light to heavy production settings. The 5xD flute-to-diameter ratio and regular spiral flute design facilitate efficient chip evacuation in short-hole drilling cycles. Its straight cylindrical shank with a 0.6299 inch decimal diameter seats securely in standard drill chucks and collet holders. This bit is part of OSG Series 1100, a high-performance line intended for industrial-grade cutting operations on steel, stainless steel, and aluminum stock.

Key Features

• 9/16 inch (14.30 mm) cutting diameter with diameter tolerance of +0 to -0.027 mm for precision fitment
• TiN coating reduces friction and extends cutting edge life compared to uncoated HSS
• 120-degree 4-facet point with web thinning for accurate self-centering and reduced thrust force
• Vanadium high-speed steel construction handles heat buildup in continuous drilling cycles
• Regular spiral flute with tapered web configuration promotes consistent chip flow
• Straight cylindrical shank fits standard drill chucks and collet toolholders without adapters

Compatibility

Designed for use on steel, stainless steel, aluminum, and non-ferrous workpieces; compatible with standard drill chucks and collet holders accepting a 0.6299 inch straight cylindrical shank. Coolant-through tooling is not supported by this bit.

Installation Notes

Installation and operation should be performed by qualified machinists familiar with rotary cutting tools and machine tool setup. Ensure the spindle and workpiece are fully secured before beginning a drilling cycle. Follow machine manufacturer guidelines for feed rate and spindle speed appropriate to the workpiece material and bit diameter. Inspect the cutting edges and TiN coating for wear before each use; a damaged or dull edge increases heat and reduces hole quality.