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PartsTable / COMPONENT / 90-121-4 ITEM 18
90-121-4 ITEM 18 ✓ Verified by PartsTable
— · COMPONENT
WHAT YOU NEED TO KNOW
Verify manufacturer and server generation compatibility Check if Option PN or Spare PN — same part, different channel
Confirm exact part number — similar PNs may be different parts
PRODUCT OVERVIEW

The SYNCHRO ASSEMBLY is a the manufacturer industrial component. Key specifications include special_features: STEERING INPUT UNIT SUBASSEMBLY, end_item_identification: HELM CONSOLE, part_name_assigned_by_controlling_agency: SYNCHRO. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5990-01-626-3840, indicating validated use in U.S. government and defense logistics supply chains. Available through authorized enterprise resellers and TPM (Third Party Maintenance) channels.

Verify compatibility with your specific system configuration before ordering.

WHERE IT FITS
90-121-4 ITEM 18
NSN: 5990-01-626-3840
FSC: 5990
CAGE: 28199 — L3 TECHNOLOGIES, INC. (USA)
SPECIFICATIONS
special_featuresSTEERING INPUT UNIT SUBASSEMBLY
end_item_identificationHELM CONSOLE
part_name_assigned_by_controlling_agencySYNCHRO
NSN5990-01-626-3840
COMPONENT DIAGRAM
COMPONENT MAIN IC EDGE CONNECTOR No detailed specs available SYNCHRO ASSEMBLY TITLE COMPONENT PN 90-121-4 ITEM 18 MFR SYNCHRO ASSEMBLY
TECHNICAL CHARACTERISTICS (FLIS)
END ITEM IDENTIFICATIONHELM CONSOLE
SPECIAL FEATURESSTEERING INPUT UNIT SUBASSEMBLY
PART NAME ASSIGNED BY CONTROLLING AGENCYSYNCHRO
VERIFIED SUBSTITUTES & CROSS-REFERENCES 3
15CX6Interchangeable
interchangeable cross-reference
interchangeable
15CX6C/20-02CInterchangeable
interchangeable cross-reference
interchangeable
M20708/20-02CInterchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 90-121-4 ITEM 18?
90-121-4 ITEM 18 is a SYNCHRO ASSEMBLY.
What parts can replace 90-121-4 ITEM 18?
There are 3 known substitutes for 90-121-4 ITEM 18: 15CX6, 15CX6C/20-02C, M20708/20-02C. Substitute compatibility should be verified for your specific system.
What is the NSN for 90-121-4 ITEM 18?
90-121-4 ITEM 18 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5990-01-626-3840. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026