Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number KB4-50 found under Rod End by Dover Engineered Systems Inc. The National Stock Number assigned to this part is 3110010893542, and the Federal Supply Class is 3110 Bearings Antifriction Unmounted. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like KB4-50.