#4-40 UNC X 1″ OD HSS Round Adjustable Threading Die

This HSS round adjustable threading die is designed for cutting new external threads or re-threading existing threads on bolts, rods, and studs. Manufactured from high-speed steel (HSS), it provides the hardness and wear resistance required for precision threading in general-purpose applications. The adjustable design allows fine tuning of thread fit, making it suitable for both shop and production environments.Designed for cutting new external threads or restoring existing threadsMade from high-speed steel (HSS) for durability and wear resistanceRound adjustable design allows fine tuning of thread fitChamfered on both faces for easier thread startingOne side features a longer chamfer for standard threading; the opposite side allows threading closer to a shoulderAdjustment achieved via fine pitch screw for precise thread sizingCompatible with standard die stocks and machine die holdersWhat It IsThis HSS round adjustable die is a precision threading tool used to cut new external threads or restore damaged threads on bolts, rods, and threaded components. Unlike hex dies primarily used for repair, round adjustable dies are designed for accurate thread cutting and fit control.Material & ConstructionThis HSS round adjustable die is a precision threading tool used to cut new external threads or restore damaged threads on bolts, rods, and threaded components. Unlike hex dies primarily used for repair, round adjustable dies are designed for accurate thread cutting and fit control.Adjustable DesignThe adjustable slot design allows fine control over thread fit. By tightening or loosening the adjustment screw, he die can be expanded or contracted to achieve the desired thread tolerance. When used in a machine holder, the adjustment screw may be removed and controlled through the holders adjustment systemChamfered for Controlled ThreadingBoth faces of the die are chamfered to assist with thread starting. One side includes a longer chamfer for standard thread cutting, while the opposite side allows threading closer to a shoulder.ApplicationsCommonly used for:Cutting new external threadsRe-threading damaged bolts or studsMaintenance and repair operationsGeneral machine shop threadingFrequently Asked QuestionsWhat is an HSS round adjustable die used for?An HSS round adjustable die is used to cut new external threads or restore existing threads on bolts, rods, and studs.What does adjustable mean on a round die?Adjustable dies allow fine tuning of the thread fit by expanding or contracting the die slightly using the adjustment screw.Can this die be used in a die stock?Yes. Round adjustable dies are designed for use with standard die stocks and many machine die holders.What is the benefit of high-speed steel (HSS)?High-speed steel provides improved hardness and wear resistance compared to carbon steel, making it suitable for precision thread cutting.Why are both sides chamfered?The chamfers help guide the die onto the workpiece. One side provides a longer lead for general threading, while the other allows threading closer to a shoulder.