The Dormer F320 HSS UNC Circular Split Die is a premium threading tool designed for precise and efficient cutting of UNC threads. Made from high-speed steel, this split die offers superior durability and wear resistance, ensuring long-lasting performance even under heavy use. The circular split design allows for easy adjustment and provides exceptional thread accuracy. This versatile tool is perfect for creating or repairing threads on a variety of materials, including steel, aluminium, and other metals. Its precision-engineered teeth ensure clean, consistent cuts, while the robust construction minimises the risk of chipping or breaking. Features & Benefits • High speed steel with bright finish • BS 1127:1950 • Right hand rotation/cutting Specifications • Thread Diameter: 4-40 UNC • Outside Diameter: 13/16” • Threads Per Inch: 40