Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number MRTB21D34 found under Terminal Block Elec by Sikorsky Aircraft Corporation. The National Stock Number assigned to this part is 2920014262792, and the Federal Supply Class is 2920 Engine Electrical System Components Nonaircraft. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like MRTB21D34.