The Carmex Spiral Mill Threading Insert for Whitworth threads (H17-11WMT7) is a versatile threading solution designed to handle Whitworth applications with ease. Its spiral geometry enables smooth cutting at higher feed rates, helping you finish threads faster and with fewer passes—ideal for everything from small components on compact machining centers to heavy-duty milling on high-power machines.

Spiral toolholders accommodate 1 to 9 inserts in a compact cutting diameter, and a unique clamping method ensures optimal indexability for repeatable results. The design also reduces vibration and chatter, supporting clean threads and stable finishes across threading, end milling roughing, and finishing tasks. Inserts are available in MT7 Sub-Micron Grade with Titanium Nitride multi-layer coating (ISO K10-K20), a general-purpose option suitable for a wide range of materials.

• Smooth, high-feed cutting with spiral geometry: The spiral flute design enables a smooth cutting action at higher feed rates, lowering cycle times and improving thread quality across Whitworth threading and milling operations.
• Flexible insert capacity and precise indexability: Holds 1–9 inserts in a compact diameter with a unique clamping method that keeps inserts accurately indexed for consistent, repeatable results.
• Vibration suppression and consistent finish quality: The spiral design minimizes chatter, delivering reliable finishes in threading as well as roughing and finishing passes.

This system leverages MT7 Sub-Micron Grade inserts with a TiN multi-layer coating to deliver durable performance across a broad material range. The combination of fast cutting, reliable indexing, and steady finishes helps you increase throughput, reduce tool changes, and achieve dependable thread quality in Whitworth applications.