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1850Z78 — PLUG,EXPANSION

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

1850Z78: PLUG,EXPANSION.

The PLUG,EXPANSION is a the manufacturer industrial component. Key specifications include height: 0.750 INCHES NOMINAL IN, radius: 0.062 INCHES NOMINAL IN, material: STEEL, outside_diameter: 1.256 INCHES MINIMUM AND 1.260 INCHES MAXIMUM IN, style_designator: TRAPPED CUP, smallest_diameter: 1.250 INCHES MINIMUM AND 1.255 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5340-00-752-1372, 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
1850Z78
NSN: 5340-00-752-1372
FSC: 5340 — Hardware, Commercial
CAGE: 78500 — MERITOR HEAVY VEHICLE SYSTEMS, LLC (USA)
SPECIFICATIONS
height0.750 INCHES NOMINAL IN
radius0.062 INCHES NOMINAL IN
materialSTEEL
outside_diameter1.256 INCHES MINIMUM AND 1.260 INCHES MAXIMUM IN
style_designatorTRAPPED CUP
smallest_diameter1.250 INCHES MINIMUM AND 1.255 INCHES MAXIMUM IN
material_thickness0.0598 INCHES NOMINAL IN
NSN5340-00-752-1372
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 1850Z78 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
•
RADIUS: 0.062 INCHES NOMINAL IN
•
OUTSIDE DIAMETER: 1.256 INCHES MINIMUM AND 1.260 INCHES MAXIMUM IN
•
STYLE DESIGNATOR: TRAPPED CUP
•
MATERIAL THICKNESS: 0.0598 INCHES NOMINAL IN
•
HEIGHT: 0.750 INCHES NOMINAL IN
•
MATERIAL: STEEL
•
SMALLEST DIAMETER: 1.250 INCHES MINIMUM AND 1.255 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS
RADIUS0.062 INCHES NOMINAL IN
OUTSIDE DIAMETER1.256 INCHES MINIMUM AND 1.260 INCHES MAXIMUM IN
STYLE DESIGNATORTRAPPED CUP
MATERIAL THICKNESS0.0598 INCHES NOMINAL IN
HEIGHT0.750 INCHES NOMINAL IN
MATERIALSTEEL
SMALLEST DIAMETER1.250 INCHES MINIMUM AND 1.255 INCHES MAXIMUM IN
OTHER ITEMS IN FSC 5340 — Hardware, Commercial
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5340-00-000-0068 5340-00-000-0132 5340-00-000-8150 5340-00-001-1251 5340-00-001-1264 5340-00-001-1265 5340-00-001-1266 5340-00-001-1275
SUBSTITUTES & CROSS-REFERENCES 3
733T5Reference document
Same NSN cross-reference
Reference document — Secondary reference
913707Reference document
Same NSN cross-reference
Reference document — Secondary reference
5340007521372Reference document
Same NSN cross-reference
Reference document — Informative reference only
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 1850Z78?
1850Z78 is a PLUG,EXPANSION.
What parts can replace 1850Z78?
There are 3 known substitutes for 1850Z78: 733T5, 913707, 5340007521372. Substitute compatibility should be verified for your specific system.
What is the NSN for 1850Z78?
1850Z78 is cataloged in the U.S. Government catalog under NSN 5340-00-752-1372. 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.