Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 41-1166 found under Cap Protective Dust by Sargent Welch Scientific Co. The National Stock Number assigned to this part is 5340009427124, and the Federal Supply Class is 5340 Hardware Commercial. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 41-1166.