The Eaton Fuller Castle Nut, part number X2-1000 or X21000 (also referenced as X-2-1000 or HFX2-1000), is a genuine Eaton manual transmission hardware component. Castle nuts are used in transmission assemblies where a cotter pin or safety wire must lock the fastener in place, preventing loosening under vibration and load. This part falls under Eaton's manual transmission components category and is sold individually. Pro Gear and Transmission carries genuine Eaton Fuller parts for drivetrain repair and maintenance. Call us to confirm proper fit for your specific transmission before ordering.
Features
Genuine Eaton Fuller manual transmission hardware
Part number X2-1000 or X21000, also cross-referenced as X-2-1000 and HFX2-1000
Castle nut design accepts cotter pin or safety wire for positive fastener retention
Sold as individual unit
Applies to manual transmission component assemblies
