Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number FIG. 6-1 ITEM 54 found under O Ring by Hermes Machine Tool Co. The National Stock Number assigned to this part is 5331012715156, 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 FIG. 6-1 ITEM 54.