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PartsTable / COMPONENT / 521-6311581 ITEM NO 56
521-6311581 ITEM NO 56 ✓ 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

MOUNTING BASE,ELECTRICAL EQUIPME. Key specifications include special_features: OVERALL LENGTH IS 4.500; OVERALL WIDTH IS 3.500; ITEM REQUIRES 4 MOUNTING HOLES.. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5975-01-412-7780, 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
521-6311581 ITEM NO 56
NSN: 5975-01-412-7780
FSC: 5975
CAGE: 53711 — NAVAL SEA SYSTEMS COMMAND (USA)
SPECIFICATIONS
special_featuresOVERALL LENGTH IS 4.500; OVERALL WIDTH IS 3.500; ITEM REQUIRES 4 MOUNTING HOLES.
NSN5975-01-412-7780
COMPONENT DIAGRAM
COMPONENT MAIN IC EDGE CONNECTOR No detailed specs available MOUNTING BASE,ELECTRICAL EQUIPME TITLE COMPONENT PN 521-6311581 ITEM NO 56 MFR MOUNTING BASE,ELECTRIC
TECHNICAL CHARACTERISTICS (FLIS)
SPECIAL FEATURESOVERALL LENGTH IS 4.500; OVERALL WIDTH IS 3.500; ITEM REQUIRES 4 MOUNTING HOLES.
VERIFIED SUBSTITUTES & CROSS-REFERENCES 9
S-060-6Interchangeable
interchangeable cross-reference
interchangeable
A-A-2473Interchangeable
interchangeable cross-reference
interchangeable
A-A-2925 TY1Interchangeable
interchangeable cross-reference
interchangeable
MS4Interchangeable
interchangeable cross-reference
interchangeable
13001010Interchangeable
interchangeable cross-reference
interchangeable
ID-10Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 521-6311581 ITEM NO 56?
521-6311581 ITEM NO 56 is a MOUNTING BASE,ELECTRICAL EQUIPME.
What parts can replace 521-6311581 ITEM NO 56?
There are 9 known substitutes for 521-6311581 ITEM NO 56: S-060-6, A-A-2473, A-A-2925 TY1 and 6 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 521-6311581 ITEM NO 56?
521-6311581 ITEM NO 56 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5975-01-412-7780. 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