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A8581-900 — VALVE,VENT

✓ Government record, cited
— · GATE VALVE
PRODUCT OVERVIEW

A8581-900: VALVE,VENT.

The VALVE,VENT is a the manufacturer industrial component. Key specifications include material: STEEL CORROSION RESISTING BODY, thread_direction: RIGHT-HAND ALL ENDS, nominal_thread_size: 0.250 INCHES ALL ENDS IN, end_item_identification: 2320-01-121-2102, thread_series_designator: UNEF ALL ENDS. This part is cataloged in the U.S.

Government catalog under NSN 4820-01-161-6547, 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
A8581-900
NSN: 4820-01-161-6547
FSC: 4820 — Valves, Nonpowered
CAGE: 1K076 — POWER PACKER NORTH AMERICA INC (USA)
SPECIFICATIONS
materialSTEEL CORROSION RESISTING BODY
thread_directionRIGHT-HAND ALL ENDS
nominal_thread_size0.250 INCHES ALL ENDS IN
end_item_identification2320-01-121-2102
thread_series_designatorUNEF ALL ENDS
NSN4820-01-161-6547
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: A8581-900 · 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
•
THREAD DIRECTION: RIGHT-HAND ALL ENDS
•
NOMINAL THREAD SIZE: 0.250 INCHES ALL ENDS IN
•
MATERIAL: STEEL CORROSION RESISTING BODY
•
THREAD SERIES DESIGNATOR: UNEF ALL ENDS
TECHNICAL CHARACTERISTICS
THREAD DIRECTIONRIGHT-HAND ALL ENDS
NOMINAL THREAD SIZE0.250 INCHES ALL ENDS IN
END ITEM IDENTIFICATION2320-01-121-2102
MATERIALSTEEL CORROSION RESISTING BODY
THREAD SERIES DESIGNATORUNEF ALL ENDS
OTHER ITEMS IN FSC 4820 — Valves, Nonpowered
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
4820-00-000-0097 4820-00-001-0010 4820-00-001-0020 4820-00-001-0021 4820-00-001-0032 4820-00-001-0037 4820-00-001-0042 4820-00-001-1230
SUBSTITUTES & CROSS-REFERENCES 1
90003559Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Terminal item — stock exhausted; no further procurementNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is A8581-900?
A8581-900 is a VALVE,VENT.
What parts can replace A8581-900?
There is 1 known substitute for A8581-900: 90003559. Substitute compatibility should be verified for your specific system.
What is the NSN for A8581-900?
A8581-900 is cataloged in the U.S. Government catalog under NSN 4820-01-161-6547. 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.