Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 203004 found under Collar Shaft by Sargent Welch Scientific Co. The National Stock Number assigned to this part is 3040010230872, 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 203004.