Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 4.08199.921 found under Caster Swivel by Colson Casters Ltd. The National Stock Number assigned to this part is 5340014087097, and the Federal Supply Class is 5340 Hardware Commercial. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 4.08199.921.