Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 13-540-044 DETAIL 27 found under O Ring by Mico Inc. The National Stock Number assigned to this part is 5331013954758, 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 13-540-044 DETAIL 27.