Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number NF-42181MK581 found under Stud Plain by Foster Wheeler North America Corp. The National Stock Number assigned to this part is 5307011299920, and the Federal Supply Class is 5307 Studs. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like NF-42181MK581.