Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 531678-138ND found under Switch Rotary by Tbr Associates Inc. The National Stock Number assigned to this part is 5930006429272, and the Federal Supply Class is 5930 Switches. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 531678-138ND.