Osg 1662500917 Thread Mill 7/16-14 Unc 4 Flute Carbide

Product Description

The OSG 1662500917 is a solid carbide helical flute thread mill designed for cutting 7/16-14 UNC internal threads in a CNC milling environment. Part of OSG Series 16625, this tool features 4 right-hand flutes and an EgiAs coating that increases surface hardness and extends tool life in demanding materials. The shank diameter measures 0.3130 inches, the cutting diameter is 0.3030 inches (0.30 mm nominal), and the length of cut is 1.0713 inches. Thread mills of this type are installed by CNC machinists and tool-and-die professionals working in precision threading applications where tap breakage risk or thread quality requirements favor milling over tapping.

This thread mill is suited for machining 7/16-14 UNC threads in ferrous and non-ferrous materials on 3-axis or full 5-axis CNC machining centers. It is particularly useful in blind-hole applications, hard materials, or situations requiring tight thread tolerances. The helical flute geometry supports chip evacuation during the interpolation cycle. Coolant-through is not supported on this tool, so flood or mist coolant delivery from the spindle environment is the standard approach. The Series 16625 designation places this tool within OSG's solid carbide thread milling line.

Key Features

• Solid carbide construction for rigidity and dimensional stability during thread interpolation
• EgiAs coating provides enhanced wear resistance and reduced friction at the cutting edge
• 4 right-hand helical flutes promote chip evacuation in through and blind hole applications
• Cuts 7/16-14 UNC threads at 14 teeth per inch with a 1.0713-inch length of cut
• 0.3130-inch shank diameter fits standard ER or shrink-fit collet toolholders

Compatibility

Designed for use on CNC machining centers capable of helical interpolation for solid carbide thread milling tools in the 7/16-14 UNC thread specification.

Installation Notes

Thread mills require a CNC control with helical interpolation capability — confirm G-code support before programming. Secure the shank in a balanced, runout-minimized collet or shrink-fit holder to maintain thread accuracy. Always verify spindle speed and feed-per-tooth values against the OSG Series 16625 cutting data before the first cut. Do not use this tool on manual mills or in non-interpolating operations.