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Technical Data Sheet
PartsTable / COMPONENT / A-A-59440/4B-020
A-A-59440/4B-020 ✓ Verified by PartsTable
— · GATE VALVE
WHAT YOU NEED TO KNOW
Full open or full close only — never throttle Rising stem shows position visually
Throttling a gate valve erodes seats
PRODUCT OVERVIEW

The A-A-59440/4B-020 is a the manufacturer industrial component. This product is currently in active production with full OEM support. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4820-00-410-1925, 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
A-A-59440/4B-020
NSN: 4820-00-410-1925
FSC: 4820
CAGE: 58536 — FEDERAL COMMERCIAL ITEM DESCRIPTION PROMULGATED BY GENERAL SERVICES ADMINISTRATION WASHINGTON DC (USA)
SPECIFICATIONS
Part NumberA-A-59440/4B-020
NSN4820-00-410-1925
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: A-A-59440/4B-020 · 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
•
RENEWABLE SEAT RING TYPE: THREADED
•
OPERATING PRESSURE: 150.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
•
NOMINAL THREAD SIZE: 0.375 INCHES FIRST END IN
•
MAXIMUM OPERATING TEMP: 351.0 FAHRENHEIT SINGLE RESPONSE DEGF
•
CONNECTION STYLE: PLAIN (PIPE) FIRST END
•
VALVE OPERATION METHOD: MANUAL
•
THREAD DIRECTION: RIGHT-HAND FIRST END
•
CONNECTION TYPE: THREADED EXTERNAL PIPE FIRST END
TECHNICAL CHARACTERISTICS (FLIS)
RENEWABLE SEAT RING TYPETHREADED
OPERATING PRESSURE150.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
NOMINAL THREAD SIZE0.375 INCHES FIRST END IN
MAXIMUM OPERATING TEMP351.0 FAHRENHEIT SINGLE RESPONSE DEGF
CONNECTION STYLEPLAIN (PIPE) FIRST END
VALVE OPERATION METHODMANUAL
THREAD DIRECTIONRIGHT-HAND FIRST END
CONNECTION TYPETHREADED EXTERNAL PIPE FIRST END
FLOW CONTROL DEVICEPLUG
STYLE DESIGNATORSTRAIGHT THRU
VERIFIED SUBSTITUTES & CROSS-REFERENCES 7
A-A-59440/4Interchangeable
interchangeable cross-reference
interchangeable
AA59440/4-019Interchangeable
interchangeable cross-reference
interchangeable
MS35785-6Interchangeable
interchangeable cross-reference
interchangeable
A-A-59440/4-015Interchangeable
interchangeable cross-reference
interchangeable
42EInterchangeable
interchangeable cross-reference
interchangeable
MS35785-7Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is A-A-59440/4B-020?
A-A-59440/4B-020 is a A-A-59440/4B-020.
What parts can replace A-A-59440/4B-020?
There are 7 known substitutes for A-A-59440/4B-020: A-A-59440/4, AA59440/4-019, MS35785-6 and 4 more. Substitute compatibility should be verified for your specific system.
What is the NSN for A-A-59440/4B-020?
A-A-59440/4B-020 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4820-00-410-1925. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026