Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number S1A-304 found under Contact Electrical by Sigmation Inc. The National Stock Number assigned to this part is 5999006110574, and the Federal Supply Class is 5999 Miscellaneous Electrical And Electronic Components. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like S1A-304.