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Technical Data Sheet
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3278A — PLUG,EXPANSION

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

3278A: PLUG,EXPANSION.

The PLUG,EXPANSION is a the manufacturer industrial component. This part is cataloged in the U.S. Government catalog under NSN 5340-00-598-5107, 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
3278A
NSN: 5340-00-598-5107
FSC: 5340 — Hardware, Commercial
CAGE: 28265 — HERCULES ENGINE CO INC (USA)
SPECIFICATIONS
Part Number3278A
NSN5340-00-598-5107
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 3278A 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
SUBSTITUTES & CROSS-REFERENCES 5
CP30TYPEASame NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
L1023Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
MD3605Reference document
Same NSN cross-reference
Reference document — Secondary reference
SA11Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
5340005985107Reference document
Same NSN cross-reference
Reference document — Informative reference only
LIFECYCLE
NSN statusCancelled· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 3278A?
3278A is a PLUG,EXPANSION.
What parts can replace 3278A?
There are 5 known substitutes for 3278A: CP30TYPEA, L1023, MD3605 and 2 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 3278A?
3278A is cataloged in the U.S. Government catalog under NSN 5340-00-598-5107. This indicates validated use in U.S. government and defense supply chains.
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