Vargus 80305 Thread Mill 5/16-18 Internal 4 Flute Carbide

Product Description

The VARGUS 80305 is a helical flute thread mill designed for cutting internal threads to a 5/16-18 UN specification. Built from micrograin solid carbide and finished with a TiCN coating, this tool delivers extended wear resistance and heat tolerance in demanding milling operations. It runs 4 right-hand flutes with 18 teeth per inch and a cutting diameter of 0.2420 inches, making it well suited for precise, small-diameter internal thread profiles. Coolant-through capability supports chip evacuation and tool life in deep or blind-hole applications. Machinists and tool-and-die professionals working with CNC machining centers are the primary users of this tool.

This thread mill is intended for internal threading operations on machining centers where interpolated thread milling is preferred over tapping. The 5/16-18 UN thread form is common in general mechanical assemblies, fixtures, and structural fastener applications across manufacturing environments. With a 0.6390-inch length of cut and a 2.4020-inch overall length, it fits standard tool holders used in vertical and horizontal machining center setups. Its micrograin carbide substrate handles both ferrous and non-ferrous workpiece materials at elevated surface speeds.

Key Features

• 5/16-18 UN internal thread form, right-hand flute direction
• Micrograin solid carbide substrate for rigidity and edge retention
• TiCN coating reduces friction and extends tool life in abrasive materials
• 4 helical flutes with 18 teeth per inch for smooth thread form generation
• Coolant-through design aids chip evacuation in blind and deep holes
• 0.2420-inch cutting diameter suits tight-tolerance small-bore threading

Compatibility

Designed as an OEM-style replacement thread mill for CNC machining center applications requiring a 5/16-18 UN internal thread profile with a helical flute geometry.

Installation Notes

Installation and operation of this thread mill should be performed by a qualified machinist or CNC operator familiar with interpolated thread milling cycles. Secure the tool in a collet or end-mill holder rated for the shank diameter before spindle engagement. Verify that the machine tool path uses the correct helical interpolation parameters for the 5/16-18 thread pitch before cutting. Always confirm the workpiece is rigidly fixtured and the spindle is at a full stop before changing or inspecting the tool.