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7803921 — SEAT,VALVE

✓ Government record, cited
— · GATE VALVE
PRODUCT OVERVIEW

7803921: SEAT,VALVE.

The SEAT,VALVE is a the manufacturer industrial component. Key specifications include material: STEEL BODY, thread_length: 0.531 INCHES NOMINAL SINGLE THREADED PORTION IN, flange_diameter: 2.656 INCHES NOMINAL IN, style_designator: FAUCET, nominal_thread_size: 2.500 INCHES SINGLE THREADED PORTION IN, under_flange_height: 0.781 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 4820-00-074-5220, 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
7803921
NSN: 4820-00-074-5220
FSC: 4820 — Valves, Nonpowered
CAGE: 05073 — BABCOCK & WILCOX CO (USA)
SPECIFICATIONS
materialSTEEL BODY
thread_length0.531 INCHES NOMINAL SINGLE THREADED PORTION IN
flange_diameter2.656 INCHES NOMINAL IN
style_designatorFAUCET
nominal_thread_size2.500 INCHES SINGLE THREADED PORTION IN
under_flange_height0.781 INCHES NOMINAL IN
body_inside_diameter1.375 INCHES MINIMUM AND 2.094 INCHES MAXIMUM IN
seating_surface_shapeFLAT
thread_quantity_per_inch16 SINGLE THREADED PORTION
thread_series_designatorUN SINGLE THREADED PORTION
flange_seat_to_disk_end_height0.250 INCHES NOMINAL IN
material_document_and_classificationSTAINLESS FORGING 410 MFR REF SINGLE MATERIAL RESPONSE BODY
NSN4820-00-074-5220
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: 7803921 · 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
•
FLANGE SEAT TO DISK END HEIGHT: 0.250 INCHES NOMINAL IN
•
FLANGE DIAMETER: 2.656 INCHES NOMINAL IN
•
THREAD LENGTH: 0.531 INCHES NOMINAL SINGLE THREADED PORTION IN
•
STYLE DESIGNATOR: FAUCET
•
MATERIAL DOCUMENT AND CLASSIFICATION: STAINLESS FORGING 410 MFR REF SINGLE MATERIAL RESPONSE BODY
•
BODY INSIDE DIAMETER: 1.375 INCHES MINIMUM AND 2.094 INCHES MAXIMUM IN
•
NOMINAL THREAD SIZE: 2.500 INCHES SINGLE THREADED PORTION IN
•
UNDER FLANGE HEIGHT: 0.781 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
FLANGE SEAT TO DISK END HEIGHT0.250 INCHES NOMINAL IN
FLANGE DIAMETER2.656 INCHES NOMINAL IN
THREAD LENGTH0.531 INCHES NOMINAL SINGLE THREADED PORTION IN
STYLE DESIGNATORFAUCET
MATERIAL DOCUMENT AND CLASSIFICATIONSTAINLESS FORGING 410 MFR REF SINGLE MATERIAL RESPONSE BODY
BODY INSIDE DIAMETER1.375 INCHES MINIMUM AND 2.094 INCHES MAXIMUM IN
NOMINAL THREAD SIZE2.500 INCHES SINGLE THREADED PORTION IN
UNDER FLANGE HEIGHT0.781 INCHES NOMINAL IN
THREAD QUANTITY PER INCH16 SINGLE THREADED PORTION
MATERIALSTEEL BODY
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 3
301125-1125Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
FM-2262Reference document
Same NSN cross-reference
Reference document — Secondary reference
FM7521DReference 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 7803921?
7803921 is a SEAT,VALVE.
What parts can replace 7803921?
There are 3 known substitutes for 7803921: 301125-1125, FM-2262, FM7521D. Substitute compatibility should be verified for your specific system.
What is the NSN for 7803921?
7803921 is cataloged in the U.S. Government catalog under NSN 4820-00-074-5220. 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.