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Technical Data Sheet
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B2731-1B — BLOCK,SUPPORT,SEAT

✓ Government record, cited
— · COMPONENT
PRODUCT OVERVIEW

B2731-1B: BLOCK,SUPPORT,SEAT.

The BLOCK,SUPPORT,SEAT is a the manufacturer industrial component. Key specifications include end_item_identification: MODEL CH-46E AIRCRAFT, general_characteristics_item_description: STEEL ESR ARMOR 4340; 6.540 IN. LG,1.000 IN.

W,0.375 IN. THK IN. This part is cataloged in the U.S.

Government catalog under NSN 1680-01-055-4130, 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
B2731-1B
NSN: 1680-01-055-4130
FSC: 1680 — Miscellaneous Aircraft Accessories and Components
CAGE: 54184 — ARA, INC (USA)
SPECIFICATIONS
end_item_identificationMODEL CH-46E AIRCRAFT
general_characteristics_item_descriptionSTEEL ESR ARMOR 4340; 6.540 IN. LG,1.000 IN. W,0.375 IN. THK IN
NSN1680-01-055-4130
COMPONENT DIAGRAM
COMPONENT MAIN IC EDGE CONNECTOR No detailed specs available BLOCK,SUPPORT,SEAT TITLE COMPONENT PN B2731-1B MFR BLOCK,SUPPORT,SEAT
KEY FEATURES
•
GENERAL CHARACTERISTICS ITEM DESCRIPTION: STEEL ESR ARMOR 4340; 6.540 IN. LG,1.000 IN. W,0.375 IN. THK IN
TECHNICAL CHARACTERISTICS
GENERAL CHARACTERISTICS ITEM DESCRIPTIONSTEEL ESR ARMOR 4340; 6.540 IN. LG,1.000 IN. W,0.375 IN. THK IN
END ITEM IDENTIFICATIONMODEL CH-46E AIRCRAFT
OTHER ITEMS IN FSC 1680 — Miscellaneous Aircraft Accessories and Components
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
1680-00-001-1736 1680-00-003-3721 1680-00-009-3782 1680-00-009-6180 1680-00-475-0002 1680-00-696-6170 1680-00-867-7158 1680-00-885-0923
SUBSTITUTES & CROSS-REFERENCES

No substitute or cross-reference records for this part.

LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Terminal item — stock exhausted; no further procurementDemilitarization required — mutilation
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FREQUENTLY ASKED QUESTIONS
What is B2731-1B?
B2731-1B is a BLOCK,SUPPORT,SEAT.
What is the NSN for B2731-1B?
B2731-1B is cataloged in the U.S. Government catalog under NSN 1680-01-055-4130. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.