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4578B — PISTON,INTERNAL COMBUSTION ENGIN

✓ Government record, cited
— · COMPONENT
PRODUCT OVERVIEW

4578B: PISTON,INTERNAL COMBUSTION ENGIN.

PISTON,INTERNAL COMBUSTION ENGIN. Key specifications include material: NICKEL ALLOY, body_style: PLAIN, corner_shape: SQUARE ALL CORNERS, overall_length: 0.625 INCHES NOMINAL IN, surface_finish: 125.0 MICROINCHES ALL SURFACES, body_inside_diameter: 3.624 INCHES MINIMUM AND 3.625 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 2805-00-421-9541, 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
4578B
NSN: 2805-00-421-9541
FSC: 2805 — Gasoline Reciprocating Engines, Except Aircraft; and Components
CAGE: 79975 — M & S CARTAGE INC (USA)
SPECIFICATIONS
materialNICKEL ALLOY
body_stylePLAIN
corner_shapeSQUARE ALL CORNERS
overall_length0.625 INCHES NOMINAL IN
surface_finish125.0 MICROINCHES ALL SURFACES
body_inside_diameter3.624 INCHES MINIMUM AND 3.625 INCHES MAXIMUM IN
body_outside_diameter4.018 INCHES NOMINAL IN
NSN2805-00-421-9541
COMPONENT DIAGRAM
COMPONENT MAIN IC EDGE CONNECTOR No detailed specs available PISTON,INTERNAL COMBUSTION ENGIN TITLE COMPONENT PN 4578B MFR PISTON,INTERNAL COMBUS
SUBSTITUTES & CROSS-REFERENCES 8
ABGA1367NReference document
Same NSN cross-reference
Reference document — Secondary reference
2448952Reference document
Same NSN cross-reference
Reference document — Secondary reference
9424136Reference document
Same NSN cross-reference
Reference document — Secondary reference
2464861Reference document
Same NSN cross-reference
Reference document — Secondary reference
P951AXReference document
Same NSN cross-reference
Reference document — Secondary reference
2318PNReference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 4578B?
4578B is a PISTON,INTERNAL COMBUSTION ENGIN.
What parts can replace 4578B?
There are 8 known substitutes for 4578B: ABGA1367N, 2448952, 9424136 and 5 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 4578B?
4578B is cataloged in the U.S. Government catalog under NSN 2805-00-421-9541. 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.