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PartsTable / COMPONENT / 551021 ITEM 6
551021 ITEM 6 ✓ 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 CONNECTING LINK,RIGID is a the manufacturer industrial component. Key specifications include part_name_assigned_by_controlling_agency: LENS COVER, BIKINI MICROSCOPE. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 3040-01-252-6315, 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
551021 ITEM 6
NSN: 3040-01-252-6315
FSC: 3040
CAGE: 11083 — CATERPILLAR INC DIV CATERPILLAR DEFENSE (USA)
SPECIFICATIONS
special_featuresECOS-O SIGHT LENS COVER. REPAIR PART FOR THE ECOS-O SIGHT, 1240-01-620-2463. WIDTH: 2.25 IN; HEIGHT: 0.38 IN; LENGTH: 3.0 IN; WEIGHT: 0.025 LB. LBS
part_name_assigned_by_controlling_agencyLENS COVER, BIKINI MICROSCOPE
NSN3040-01-252-6315
COMPONENT DIAGRAM
COMPONENT MAIN IC EDGE CONNECTOR No detailed specs available CONNECTING LINK,RIGID TITLE COMPONENT PN 551021 ITEM 6 MFR CONNECTING LINK,RIGID
VERIFIED SUBSTITUTES & CROSS-REFERENCES 22
12 204Interchangeable
interchangeable cross-reference
interchangeable
B38262Interchangeable
interchangeable cross-reference
interchangeable
84389 12204Interchangeable
interchangeable cross-reference
interchangeable
407Interchangeable
interchangeable cross-reference
interchangeable
R18Interchangeable
interchangeable cross-reference
interchangeable
503-S 4Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 551021 ITEM 6?
551021 ITEM 6 is a CONNECTING LINK,RIGID.
What parts can replace 551021 ITEM 6?
There are 22 known substitutes for 551021 ITEM 6: 12 204, B38262, 84389 12204 and 19 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 551021 ITEM 6?
551021 ITEM 6 is cataloged in the Federal Logistics Information System (FLIS) under NSN 3040-01-252-6315. 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