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Technical Data Sheet
PartsTable / COMPONENT / 121-4085#
121-4085# ✓ 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 121-4085# is a the manufacturer industrial component. This product is currently in active production with full OEM support. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 2520-01-117-8610, 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
121-4085#
NSN: 2520-01-117-8610
FSC: 2520
CAGE: 77873 — ROCKFORD POWERTRAIN INC DIV POWERTRAIN ROCKFORD, INC. (USA)
SPECIFICATIONS
Part Number121-4085#
NSN2520-01-117-8610
COMPONENT DIAGRAM
COMPONENT MAIN IC EDGE CONNECTOR No detailed specs available 121-4085# TITLE COMPONENT PN 121-4085# MFR 121-4085#
KEY FEATURES
•
OUTSIDE SHAPE: ROUND
•
FORK HEIGHT: 4.500 INCHES NOMINAL IN
•
CONNECTION END TYPE: HUB
•
HUB END THREAD PROVISION: UNTHREADED
•
OUTSIDE DIAMETER: 1.875 INCHES NOMINAL IN
•
SHAFT SPLINE QUANTITY: 10
TECHNICAL CHARACTERISTICS (FLIS)
SPECIAL FEATURESKEYWAY0.375 IN. WIDE;DUST CAP INCLUDED IN
OUTSIDE SHAPEROUND
FORK HEIGHT4.500 INCHES NOMINAL IN
CONNECTION END TYPEHUB
HUB END THREAD PROVISIONUNTHREADED
OUTSIDE DIAMETER1.875 INCHES NOMINAL IN
SHAFT SPLINE QUANTITY10
VERIFIED SUBSTITUTES & CROSS-REFERENCES 23
2510 49/64Interchangeable
interchangeable cross-reference
interchangeable
C08877Interchangeable
interchangeable cross-reference
interchangeable
120 49/64Interchangeable
interchangeable cross-reference
interchangeable
1214085Interchangeable
interchangeable cross-reference
interchangeable
537LXInterchangeable
interchangeable cross-reference
interchangeable
11549Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 121-4085#?
121-4085# is a 121-4085#.
What parts can replace 121-4085#?
There are 23 known substitutes for 121-4085#: 2510 49/64, C08877, 120 49/64 and 20 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 121-4085#?
121-4085# is cataloged in the Federal Logistics Information System (FLIS) under NSN 2520-01-117-8610. 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