Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 16A2300-21 found under Adapter Square Drve by Williams Pyro Inc. The National Stock Number assigned to this part is 3040010596877, and the Federal Supply Class is 3040 Miscellaneous Power Transmission Equipment. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 16A2300-21.