Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number H4158121 ITEM 027 found under Connector Bulkhead by Electric Boat Corporation. The National Stock Number assigned to this part is 5935016220338, and the Federal Supply Class is 5935 Connectors Electrical. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like H4158121 ITEM 027.