Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 50-0-9MM HB found under Lead Pencil Graphit by Pentel Co Ltd. The National Stock Number assigned to this part is 7510010922435, and the Federal Supply Class is . Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 50-0-9MM HB.