Accupro C911-00832 Thread Mill 8-32 Unc 3 Flute Solid Carbide

Product Description

The ACCUPRO C911-00832 is a solid carbide helical flute thread mill designed for cutting internal UNC threads in a single helical pass. It features a 3-flute, right-hand flute configuration with a 0.12-inch cutting diameter and a 1/4-inch length of cut. The micrograin carbide substrate is coated with TiAlN for improved heat resistance and tool life at higher cutting speeds. The 1/8-inch shank diameter is held to a tolerance of 0.0003 inches, ensuring consistent runout in collet-style toolholders. This tool is used by machinists and toolroom technicians working with CNC machining centers.

This thread mill is suited for internal 8-32 UNC thread production in small-bore applications on CNC mills and machining centers. The helical interpolation method allows a single tool to produce the full thread form, making it a practical choice for low-volume production, prototype work, and repair threading where tap breakage is a concern. It does not require coolant-through capability, so standard flood or mist coolant delivery is typical in most setups.

Key Features

• Cuts internal 8-32 UNC threads at 32 teeth per inch (TPI)
• 3-flute right-hand helical design for chip clearance in blind and through holes
• Micrograin solid carbide construction for rigidity in small-diameter tooling
• TiAlN coating extends tool life at elevated cutting temperatures
• 0.12-inch cutting diameter with 0.25-inch length of cut
• Shank diameter tolerance of 0.0003 inches for consistent collet grip and runout

Compatibility

Designed for CNC milling machines and machining centers using helical thread interpolation to produce internal 8-32 UNC threads. Compatible with standard 1/8-inch bore collet toolholders.

Installation Notes

Thread mills of this diameter require a rigid, low-runout collet holder — ER11 or equivalent is typical for 1/8-inch shanks. Program the tool path using the CNC control's helical interpolation cycle; verify pitch and thread engagement values against the control's thread milling canned cycle before cutting. Confirm spindle speed and feed rate against the manufacturer's recommended surface footage for TiAlN-coated carbide in the workpiece material. Inspect the cutting edges before each use, as micrograin carbide at this diameter is brittle and sensitive to side loading.