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6404328 — VALVE,VENT

✓ Government record, cited
— · GATE VALVE
PRODUCT OVERVIEW

6404328: VALVE,VENT.

The VALVE,VENT is a the manufacturer industrial component. Key specifications include material: COPPER ALLOY OVERALL, head_style: HEADLESS (SETSCREW), point_style: FLAT, thread_class: 3A A, thread_length: 0.500 INCHES NOMINAL IN, point_diameter: 0.118 INCHES MINIMUM AND 0.132 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 4820-01-442-0372, 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
6404328
NSN: 4820-01-442-0372
NIINs: 014420372, 014439807, 014440993, 014442470, 015414698
FSC: 4820 — Valves, Nonpowered
CAGE: 53711 — NAVAL SEA SYSTEMS COMMAND (USA)
SPECIFICATIONS
materialCOPPER ALLOY OVERALL
head_styleHEADLESS (SETSCREW)
point_styleFLAT
thread_class3A A
thread_length0.500 INCHES NOMINAL IN
point_diameter0.118 INCHES MINIMUM AND 0.132 INCHES MAXIMUM IN
fastener_length0.500 INCHES NOMINAL IN
special_featuresITEM CONFORMS TO FED SPEC FF-S-200,TY I,STY 1
thread_directionRIGHT-HAND
width_across_flats0.125 INCHES NOMINAL IN
internal_drive_styleHEXAGON
end_item_identificationMBT VENT VALVE ASSY,SSN SEAWOLF CLASS SUB
NSN4820-01-442-0372
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: 6404328 · OEM ⚠ VERIFY BEFORE ORDERING Gate valves = FULL OPEN or FULL CLOSE only — never throttle. Partial opening causes seat erosion and vibration. ✓ BROKER TIP Rising stem shows valve position visually — easier maintenance. Non-rising stem saves headroom. PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
FURNISHED ITEMS AND QUANTITY: 2 SPRING
•
MEDIA FOR WHICH DESIGNED: AIR SINGLE RESPONSE
TECHNICAL CHARACTERISTICS
FURNISHED ITEMS AND QUANTITY2 SPRING
SPECIAL FEATURESAPPL.MAIN BALLAST TANK NO.4
MEDIA FOR WHICH DESIGNEDAIR SINGLE RESPONSE
END ITEM IDENTIFICATIONSEAWOLF CLASS SUBMARINE
SUBSTITUTES & CROSS-REFERENCES 3
563-6404328-AY96Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
DF6002-413Reference document
Same NSN cross-reference
Reference document — Drawing number reference only
DF6002-413 AY96Reference document
Same NSN cross-reference
Reference document — Secondary reference
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 6404328?
6404328 is a VALVE,VENT.
What parts can replace 6404328?
There are 3 known substitutes for 6404328: 563-6404328-AY96, DF6002-413, DF6002-413 AY96. Substitute compatibility should be verified for your specific system.
What is the NSN for 6404328?
6404328 is cataloged in the U.S. Government catalog under NSN 4820-01-442-0372. 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.