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955AS343-1 — PLUG,VENT

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

955AS343-1: PLUG,VENT.

The PLUG,VENT is a the manufacturer industrial component. Key specifications include length: 0.750 INCHES NOMINAL IN, material: COPPER ALLOY, thread_class: 2A A, thread_length: 0.500 INCHES NOMINAL IN, vent_hole_shape: ROUND, outside_diameter: 0.688 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5340-01-139-3478, 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
955AS343-1
NSN: 5340-01-139-3478
FSC: 5340 — Hardware, Commercial
CAGE: 30003 — NAVAL AIR SYSTEMS COMMAND MANAGED ORIGINAL DESIGN ACTIVITY NOT MATERIAL/PARTS SUPPLIER (USA)
SPECIFICATIONS
length0.750 INCHES NOMINAL IN
materialCOPPER ALLOY
thread_class2A A
thread_length0.500 INCHES NOMINAL IN
vent_hole_shapeROUND
outside_diameter0.688 INCHES NOMINAL IN
vent_hole_quantity1
end_connection_typeTHREADED
refinement_device_typeFILTER DISK
thread_size_and_series/type_designator0.375 NPT
NSN5340-01-139-3478
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 955AS343-1 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
•
LENGTH: 0.750 INCHES NOMINAL IN
•
VENT HOLE SHAPE: ROUND
•
THREAD LENGTH: 0.500 INCHES NOMINAL IN
•
END CONNECTION TYPE: THREADED
•
OUTSIDE DIAMETER: 0.688 INCHES NOMINAL IN
•
THREAD CLASS: 2A A
•
MATERIAL: COPPER ALLOY
•
THREAD SIZE AND SERIES/TYPE DESIGNATOR: 0.375 NPT
TECHNICAL CHARACTERISTICS
LENGTH0.750 INCHES NOMINAL IN
VENT HOLE SHAPEROUND
THREAD LENGTH0.500 INCHES NOMINAL IN
END CONNECTION TYPETHREADED
OUTSIDE DIAMETER0.688 INCHES NOMINAL IN
THREAD CLASS2A A
MATERIALCOPPER ALLOY
THREAD SIZE AND SERIES/TYPE DESIGNATOR0.375 NPT
VENT HOLE QUANTITY1
REFINEMENT DEVICE TYPEFILTER DISK
SUBSTITUTES & CROSS-REFERENCES 2
955AS343Reference document
Same NSN cross-reference
Reference document — Vendor item drawing reference
ASP3BV3/8Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 955AS343-1?
955AS343-1 is a PLUG,VENT.
What parts can replace 955AS343-1?
There are 2 known substitutes for 955AS343-1: 955AS343, ASP3BV3/8. Substitute compatibility should be verified for your specific system.
What is the NSN for 955AS343-1?
955AS343-1 is cataloged in the U.S. Government catalog under NSN 5340-01-139-3478. 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.