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FSM121 ✓ 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 SOCKET,SOCKET WRENCH is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, overall_length: 23.8 MILLIMETERS NOMINAL MM, drive_end_shape: SQUARE SINGLE END INTERNAL, style_designator: INTERNAL-INTERNAL, features_provided: MANUAL TOOL, surface_treatment: CHROMIUM OVERALL. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5120-01-348-9115, 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
FSM121
NSN: 5120-01-348-9115
FSC: 5120
CAGE: 55719 — IDSC HOLDINGS LLC DIV SNAP-ON INDUSTRIAL, A DIV. OF IDSC HOLDINGS , LLC (USA)
SPECIFICATIONS
materialSTEEL OVERALL
overall_length23.8 MILLIMETERS NOMINAL MM
drive_end_shapeSQUARE SINGLE END INTERNAL
style_designatorINTERNAL-INTERNAL
features_providedMANUAL TOOL
surface_treatmentCHROMIUM OVERALL
drive_surface_size0.375 INCHES NOMINAL SINGLE END IN
wrenching_surface_size12.0 MILLIMETERS NOMINAL SINGLE END MM
wrenching_surface_shape6 POINT SINGLE END INTERNAL
NSN5120-01-348-9115
COMPONENT DIAGRAM
COMPONENT MAIN IC EDGE CONNECTOR No detailed specs available SOCKET,SOCKET WRENCH TITLE COMPONENT PN FSM121 MFR SOCKET,SOCKET WRENCH
KEY FEATURES
•
DRIVE SURFACE SIZE: 0.375 INCHES NOMINAL SINGLE END IN
•
FEATURES PROVIDED: MANUAL TOOL
•
SURFACE TREATMENT: CHROMIUM OVERALL
•
WRENCHING SURFACE SIZE: 12.0 MILLIMETERS NOMINAL SINGLE END MM
•
DRIVE END SHAPE: SQUARE SINGLE END INTERNAL
•
STYLE DESIGNATOR: INTERNAL-INTERNAL
•
WRENCHING SURFACE SHAPE: 6 POINT SINGLE END INTERNAL
TECHNICAL CHARACTERISTICS (FLIS)
DRIVE SURFACE SIZE0.375 INCHES NOMINAL SINGLE END IN
FEATURES PROVIDEDMANUAL TOOL
SURFACE TREATMENTCHROMIUM OVERALL
WRENCHING SURFACE SIZE12.0 MILLIMETERS NOMINAL SINGLE END MM
DRIVE END SHAPESQUARE SINGLE END INTERNAL
STYLE DESIGNATORINTERNAL-INTERNAL
WRENCHING SURFACE SHAPE6 POINT SINGLE END INTERNAL
OVERALL LENGTH23.8 MILLIMETERS NOMINAL MM
MATERIALSTEEL OVERALL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 12
DG328-89Interchangeable
interchangeable cross-reference
interchangeable
380-12Interchangeable
interchangeable cross-reference
interchangeable
328-89Interchangeable
interchangeable cross-reference
interchangeable
28KP884Interchangeable
interchangeable cross-reference
interchangeable
310-12Interchangeable
interchangeable cross-reference
interchangeable
2D62088PK-001Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is FSM121?
FSM121 is a SOCKET,SOCKET WRENCH.
What parts can replace FSM121?
There are 12 known substitutes for FSM121: DG328-89, 380-12, 328-89 and 9 more. Substitute compatibility should be verified for your specific system.
Is FSM121 still available?
FSM121 is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026