Osg 1662501617 Thread Mill 9/16-18 Unf 5 Flute Solid Carbide

Product Description

The OSG 1662501617 is a solid carbide helical flute thread mill designed for cutting 9/16-18 UNF threads in both internal and external applications. With 5 right-hand flutes and a cutting diameter of 0.382 inches, it produces clean, accurate threads in a single helical pass. The 1/2-inch shank diameter provides rigid tool holding, and the EgiAs coating extends tool life in demanding materials. A length of cut of 1.278 inches accommodates typical thread depths for this fastener size. Machinists and tool-and-die professionals working in production or job-shop environments rely on this tool for precision thread milling where tapping is impractical or where thread quality requirements are tight.

This thread mill is suited for machining centers capable of helical interpolation. It handles both internal bores and external bosses at the 9/16-18 UNF thread specification, making it a versatile single-tool solution when both thread forms appear on the same workpiece. It is appropriate for use in ferrous and non-ferrous materials where the EgiAs coating provides a performance advantage. Right-hand flute direction matches standard spindle rotation for conventional thread milling programs.

Key Features

• Cuts 9/16-18 UNF threads internally and externally with one tool
• 5 right-hand helical flutes for smooth chip evacuation and finish
• Solid carbide construction for rigidity and dimensional stability
• EgiAs coating for extended tool life and reduced built-up edge
• 0.382-inch cutting diameter with 1.278-inch length of cut
• 1/2-inch shank diameter for secure, standard toolholder compatibility

Compatibility

Designed for use in machining centers with helical interpolation capability programmed to the 9/16-18 UNF thread standard.

Installation Notes

Thread mills require a CNC machining center with helical interpolation; do not use in manual or non-interpolating setups. Confirm toolholder runout is within acceptable limits before threading operations, as excess runout directly affects thread quality. Use appropriate cutting fluid or coolant directed at the cutting zone; this tool does not feature through-coolant. Always verify the CNC program thread direction and pitch match the 9/16-18 UNF specification before cutting.