Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 0634 306 258 found under O Ring by Zf Friedrichshafen Ag. The National Stock Number assigned to this part is 5331121293675, 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 0634 306 258.