Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 21D-112-S-3.5-A-A-E-4 found under Pt 100 Dual Elemen by Rdf Corporation. The National Stock Number assigned to this part is 6685015838099, and the Federal Supply Class is . Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 21D-112-S-3.5-A-A-E-4.