Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number PB1000 5 1 2IN found under Guide Card by Unitrack Industries Inc. The National Stock Number assigned to this part is 5999010217958, and the Federal Supply Class is 5999 Miscellaneous Electrical And Electronic Components. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like PB1000 5 1 2IN.