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3S4021 — PISTON,INTERNAL COMBUSTION ENGIN

✓ Government record, cited
— · COMPONENT
PRODUCT OVERVIEW

3S4021: PISTON,INTERNAL COMBUSTION ENGIN.

PISTON,INTERNAL COMBUSTION ENGIN. Key specifications include diameter: 4.500 INCHES NOMINAL IN, material: ALUMINUM, overall_height: 5.500 INCHES NOMINAL IN, pin_hole_bushing: NOT INCLUDED, pinhole_diameter: 1.5000 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 2815-00-103-5630, 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
3S4021
NSN: 2815-00-103-5630
FSC: 2815 — Diesel Engines and Components
CAGE: 11083 — CATERPILLAR INC DIV CATERPILLAR DEFENSE (USA)
SPECIFICATIONS
diameter4.500 INCHES NOMINAL IN
materialALUMINUM
overall_height5.500 INCHES NOMINAL IN
pin_hole_bushingNOT INCLUDED
pinhole_diameter1.5000 INCHES NOMINAL IN
NSN2815-00-103-5630
COMPONENT DIAGRAM
COMPONENT MAIN IC EDGE CONNECTOR No detailed specs available PISTON,INTERNAL COMBUSTION ENGIN TITLE COMPONENT PN 3S4021 MFR PISTON,INTERNAL COMBUS
KEY FEATURES
•
DIAMETER: 4.500 INCHES NOMINAL IN
•
PIN: NOT INCLUDED
•
RING: INCLUDED
•
PINHOLE DIAMETER: 1.5000 INCHES NOMINAL IN
•
PIN HOLE BUSHING: NOT INCLUDED
•
MATERIAL: ALUMINUM
TECHNICAL CHARACTERISTICS
OVERALL HEIGHT5.500 INCHES NOMINAL IN
DIAMETER4.500 INCHES NOMINAL IN
PINNOT INCLUDED
RINGINCLUDED
PINHOLE DIAMETER1.5000 INCHES NOMINAL IN
PIN HOLE BUSHINGNOT INCLUDED
MATERIALALUMINUM
OTHER ITEMS IN FSC 2815 — Diesel Engines and Components
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
2815-00-011-9099 2815-00-017-1875 2815-00-024-4185 2815-00-033-1482 2815-00-036-5350 2815-00-179-7630 2815-00-346-4639 2815-00-592-5308
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 procurementNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 3S4021?
3S4021 is a PISTON,INTERNAL COMBUSTION ENGIN.
What is the NSN for 3S4021?
3S4021 is cataloged in the U.S. Government catalog under NSN 2815-00-103-5630. 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.