Osg 4100000911 Thread Mill 1/4-28 Unf 3 Flute Solid Carbide

Product Description

The OSG 4100000911 is a helical flute thread mill designed for cutting internal 1/4-28 UNF threads in a single helical pass. Built from solid carbide and finished with an EXO TiAlN coating, this tool offers high wear resistance and thermal stability during milling operations. It runs three right-hand flutes with a cutting diameter of 0.18 inches and a length of cut of 0.394 inches. The 0.25-inch shank seats into standard tool holders, and the 3.0-inch overall length provides clearance in most machining center setups. Licensed machinists and CNC operators use this tool where tapping is impractical or where thread quality demands are high.

This thread mill is suited for internal UNF thread applications in precision machining environments, including aerospace, automotive, and general manufacturing. The helical flute geometry allows the tool to enter the bore, interpolate the thread profile in a single arc move, and exit cleanly. It is appropriate for use in CNC machining centers with helical interpolation capability. No coolant-through feature is present, so external coolant or mist should be directed at the cutting zone. The 1/4-28 UNF thread standard covers fine-pitch fastener applications where vibration resistance and thread engagement strength are priorities.

Key Features

• Solid carbide construction for rigidity and wear resistance in hardened and abrasive materials
• EXO TiAlN coating reduces heat buildup and extends tool life at elevated cutting speeds
• 3 right-hand helical flutes for smooth chip evacuation during internal thread interpolation
• 0.18-inch cutting diameter with 0.394-inch length of cut sized for 1/4-28 UNF thread depth
• Right-hand thread direction compatible with standard CNC helical interpolation cycles
• No coolant-through — compatible with external flood or mist coolant delivery

Compatibility

Designed for cutting internal 1/4-28 UNF threads using CNC helical interpolation; fits standard 1/4-inch diameter tool holders used in vertical and horizontal machining centers.

Installation Notes

Installation and operation should be performed by a qualified CNC machinist or tooling technician familiar with thread milling cycles. Confirm the machine control supports helical interpolation before programming. Secure the shank fully in a collet or end mill holder and verify runout before cutting. Follow the tool manufacturer feed, speed, and axial step-down recommendations for the workpiece material — do not use tapping cycles with this tool.