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PartsTable / COMPONENT / FV21-053
FV21-053 ✓ 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 SEAT,VALVE is a the manufacturer industrial component. Key specifications include material: STEEL CORROSION RESISTING OVERALL, thread_class: 2A SINGLE THREADED PORTION A, thread_length: 0.125 INCHES NOMINAL SINGLE THREADED PORTION IN, flange_diameter: 0.562 INCHES NOMINAL IN, style_designator: THREADED FLANGED, nominal_thread_size: 0.438 INCHES SINGLE THREADED PORTION IN. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4820-00-513-8148, 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
FV21-053
NSN: 4820-00-513-8148
FSC: 4820
CAGE: 04845 — AUTOMATIC SWITCH COMPANY DBA ASCO (USA)
SPECIFICATIONS
materialSTEEL CORROSION RESISTING OVERALL
thread_class2A SINGLE THREADED PORTION A
thread_length0.125 INCHES NOMINAL SINGLE THREADED PORTION IN
flange_diameter0.562 INCHES NOMINAL IN
style_designatorTHREADED FLANGED
nominal_thread_size0.438 INCHES SINGLE THREADED PORTION IN
under_flange_height0.375 INCHES NOMINAL IN
body_inside_diameter0.125 INCHES NOMINAL IN
seating_surface_shapeFLAT
seal_accommodation_typeGROOVED
thread_series_designatorUNF SINGLE THREADED PORTION
flange_seat_to_disk_end_height0.094 INCHES NOMINAL IN
NSN4820-00-513-8148
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: FV21-053 · 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 SERIES DESIGNATOR: UNF SINGLE THREADED PORTION
•
STYLE DESIGNATOR: THREADED FLANGED
•
MATERIAL: STEEL CORROSION RESISTING OVERALL
•
NOMINAL THREAD SIZE: 0.438 INCHES SINGLE THREADED PORTION IN
•
BODY INSIDE DIAMETER: 0.125 INCHES NOMINAL IN
•
SEAL ACCOMMODATION TYPE: GROOVED
•
SEATING SURFACE SHAPE: FLAT
•
UNDER FLANGE HEIGHT: 0.375 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
THREAD SERIES DESIGNATORUNF SINGLE THREADED PORTION
STYLE DESIGNATORTHREADED FLANGED
MATERIALSTEEL CORROSION RESISTING OVERALL
NOMINAL THREAD SIZE0.438 INCHES SINGLE THREADED PORTION IN
BODY INSIDE DIAMETER0.125 INCHES NOMINAL IN
SEAL ACCOMMODATION TYPEGROOVED
SEATING SURFACE SHAPEFLAT
UNDER FLANGE HEIGHT0.375 INCHES NOMINAL IN
THREAD CLASS2A SINGLE THREADED PORTION A
THREAD LENGTH0.125 INCHES NOMINAL SINGLE THREADED PORTION IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 18
A20-1AInterchangeable
interchangeable cross-reference
interchangeable
2105-3Interchangeable
interchangeable cross-reference
interchangeable
A20-1ABInterchangeable
interchangeable cross-reference
interchangeable
8JA374Interchangeable
interchangeable cross-reference
interchangeable
592AInterchangeable
interchangeable cross-reference
interchangeable
4251346Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is FV21-053?
FV21-053 is a SEAT,VALVE.
What parts can replace FV21-053?
There are 18 known substitutes for FV21-053: A20-1A, 2105-3, A20-1AB and 15 more. Substitute compatibility should be verified for your specific system.
What is the NSN for FV21-053?
FV21-053 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4820-00-513-8148. 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