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3-2957-21 — PLUG,VENT

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

3-2957-21: PLUG,VENT.

The PLUG,VENT is a the manufacturer industrial component. Key specifications include length: 0.625 INCHES NOMINAL IN, material: ALUMINUM ALLOY, thread_class: 2A A, thread_length: 0.375 INCHES NOMINAL IN, inside_diameter: 0.500 INCHES NOMINAL IN, vent_hole_shape: ROUND. This part is cataloged in the U.S.

Government catalog under NSN 5340-00-673-1789, 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
3-2957-21
NSN: 5340-00-673-1789
FSC: 5340 — Hardware, Commercial
CAGE: 09990 — PARKER-HANNIFIN CORPORATION DBA PNEUTRONICS DIV HYDRAULIC VALVE DIVISION (USA)
SPECIFICATIONS
length0.625 INCHES NOMINAL IN
materialALUMINUM ALLOY
thread_class2A A
thread_length0.375 INCHES NOMINAL IN
inside_diameter0.500 INCHES NOMINAL IN
vent_hole_shapeROUND
outside_diameter0.875 INCHES NOMINAL IN
vent_hole_diameter0.312 INCHES NOMINAL IN
vent_hole_quantity1
end_connection_typeTHREADED
thread_size_and_series/type_designator0.875-14 UNF
NSN5340-00-673-1789
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 3-2957-21 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
•
VENT HOLE DIAMETER: 0.312 INCHES NOMINAL IN
•
LENGTH: 0.625 INCHES NOMINAL IN
•
VENT HOLE SHAPE: ROUND
•
THREAD LENGTH: 0.375 INCHES NOMINAL IN
•
END CONNECTION TYPE: THREADED
•
OUTSIDE DIAMETER: 0.875 INCHES NOMINAL IN
•
INSIDE DIAMETER: 0.500 INCHES NOMINAL IN
•
THREAD CLASS: 2A A
TECHNICAL CHARACTERISTICS
VENT HOLE DIAMETER0.312 INCHES NOMINAL IN
LENGTH0.625 INCHES NOMINAL IN
VENT HOLE SHAPEROUND
THREAD LENGTH0.375 INCHES NOMINAL IN
END CONNECTION TYPETHREADED
OUTSIDE DIAMETER0.875 INCHES NOMINAL IN
INSIDE DIAMETER0.500 INCHES NOMINAL IN
THREAD CLASS2A A
MATERIALALUMINUM ALLOY
THREAD SIZE AND SERIES/TYPE DESIGNATOR0.875-14 UNF
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

No substitute or cross-reference records for this part.

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 3-2957-21?
3-2957-21 is a PLUG,VENT.
What is the NSN for 3-2957-21?
3-2957-21 is cataloged in the U.S. Government catalog under NSN 5340-00-673-1789. 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.