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Technical Data Sheet
PartsTable / COMPONENT / 4780A
4780A ✓ Verified by PartsTable
— · ORING SEAL
WHAT YOU NEED TO KNOW
Material determines chemical compatibility Standard durometer is 70 Shore A
Wrong material = catastrophic seal failure
PRODUCT OVERVIEW

The PLUG,EXPANSION is a the manufacturer industrial component. Key specifications include radius: 2.375 INCHES NOMINAL IN, material: COPPER ALLOY, outside_diameter: 1.625 INCHES NOMINAL IN, style_designator: CONCAVE, material_thickness: 0.083 INCHES NOMINAL IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-00-050-1569, 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
4780A
NSN: 5340-00-050-1569
FSC: 5340
CAGE: 28265 — HERCULES ENGINE CO INC (USA)
SPECIFICATIONS
radius2.375 INCHES NOMINAL IN
materialCOPPER ALLOY
outside_diameter1.625 INCHES NOMINAL IN
style_designatorCONCAVE
material_thickness0.083 INCHES NOMINAL IN
NSN5340-00-050-1569
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 4780A MFR: OEM ⚠ VERIFY BEFORE ORDERING Wrong material = failure. Viton for oil/fuel, EPDM for water/steam, Buna-N for general purpose, Silicone for food-grade. Chemical incompatibility causes swelling, brittleness, or rapid degradation ✓ BROKER TIP Durometer (hardness) affects sealing pressure tolerance. Higher Shore A = harder = higher pressure. Standard durometer is 70A — verify if application requires different hardness PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
OUTSIDE DIAMETER: 1.625 INCHES NOMINAL IN
•
MATERIAL THICKNESS: 0.083 INCHES NOMINAL IN
•
MATERIAL: COPPER ALLOY
•
RADIUS: 2.375 INCHES NOMINAL IN
•
STYLE DESIGNATOR: CONCAVE
TECHNICAL CHARACTERISTICS (FLIS)
OUTSIDE DIAMETER1.625 INCHES NOMINAL IN
MATERIAL THICKNESS0.083 INCHES NOMINAL IN
MATERIALCOPPER ALLOY
RADIUS2.375 INCHES NOMINAL IN
STYLE DESIGNATORCONCAVE
VERIFIED SUBSTITUTES & CROSS-REFERENCES 8
211072Upgraded Successor
successor cross-reference
successor
667346Upgraded Successor
successor cross-reference
successor
860861Upgraded Successor
successor cross-reference
successor
5910E1050Upgraded Successor
successor cross-reference
successor
50-1569Interchangeable
interchangeable cross-reference
interchangeable
140802Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 4780A?
4780A is a PLUG,EXPANSION.
What parts can replace 4780A?
There are 8 known substitutes for 4780A: 211072, 667346, 860861 and 5 more. Substitute compatibility should be verified for your specific system.
Is 4780A still available?
4780A 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