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181A353-1 — VALVE,VACUUM REGULATING

✓ Government record, cited
— · GATE VALVE
PRODUCT OVERVIEW

181A353-1: VALVE,VACUUM REGULATING.

The VALVE,VACUUM REGULATING is a the manufacturer industrial component. Key specifications include body_style: STRAIGHT THRU, temp_rating: 135.0 FAHRENHEIT DEGF, temp_adjustability: ADJUSTABLE, first_end_thread_class: 3A A, end_item_identification: AIRCRAFT (AC-130A, AC-130H, MC-130H, EC-130E, HC-130) A, second_end_thread_class: 3B. This part is cataloged in the U.S.

Government catalog under NSN 4820-01-445-5555, 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
181A353-1
NSN: 4820-01-445-5555
FSC: 4820 — Valves, Nonpowered
CAGE: 03640 — LOCKHEED MARTIN CORPORATION DIV ROTARY AND MISSION SYSTEMS (USA)
SPECIFICATIONS
body_styleSTRAIGHT THRU
temp_rating135.0 FAHRENHEIT DEGF
temp_adjustabilityADJUSTABLE
first_end_thread_class3A A
end_connection_quantity2
end_item_identificationAIRCRAFT (AC-130A, AC-130H, MC-130H, EC-130E, HC-130) A
second_end_thread_class3B
first_end_connection_typeTHREADED EXTERNAL TUBE
first_end_style_designatorFLARED
first_end_thread_directionRIGHT-HAND
second_end_connection_typeTHREADED INTERNAL BOSS
first_end_seat_angle_in_deg37.0
NSN4820-01-445-5555
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: 181A353-1 · 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
•
FIRST END THREAD SERIES DESIGNATOR: UNIFIED NATIONAL JOINT (UNJ)
•
FIRST END THREAD DIRECTION: RIGHT-HAND
•
TEMP RATING: -35.0 FAHRENHEIT DEGF
•
SECOND END NOMINAL THREAD SIZE: 0.438 INCHES IN
•
SECOND END RELATIONSHIP WITH FIRST END: NOT IDENTICAL
•
SECOND END THREAD CLASS: 3B
•
BODY STYLE: STRAIGHT THRU
TECHNICAL CHARACTERISTICS
FIRST END THREAD SERIES DESIGNATORUNIFIED NATIONAL JOINT (UNJ)
FIRST END THREAD DIRECTIONRIGHT-HAND
TEMP RATING-35.0 FAHRENHEIT DEGF
TEMP RATING135.0 FAHRENHEIT DEGF
SECOND END NOMINAL THREAD SIZE0.438 INCHES IN
SECOND END RELATIONSHIP WITH FIRST ENDNOT IDENTICAL
SECOND END THREAD CLASS3B
BODY STYLESTRAIGHT THRU
FIRST END SEAT ANGLE IN DEG37.0
FIRST END THREAD CLASS3A A
SUBSTITUTES & CROSS-REFERENCES 1
181A353Reference document
Same NSN cross-reference
Reference document — Vendor item drawing reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)Demilitarization required — critical (Q)
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FREQUENTLY ASKED QUESTIONS
What is 181A353-1?
181A353-1 is a VALVE,VACUUM REGULATING.
What parts can replace 181A353-1?
There is 1 known substitute for 181A353-1: 181A353. Substitute compatibility should be verified for your specific system.
What is the NSN for 181A353-1?
181A353-1 is cataloged in the U.S. Government catalog under NSN 4820-01-445-5555. 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.