Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 66.072.042 found under Thumbscrew by Heidelberg Usa Inc. The National Stock Number assigned to this part is 5305012980599, and the Federal Supply Class is 5305 Screws. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 66.072.042.