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21556-400-1 — SUBPLATE ASSEMBLY,VALVE

✓ Government record, cited
— · GATE VALVE
PRODUCT OVERVIEW

21556-400-1: SUBPLATE ASSEMBLY,VALVE.

The SUBPLATE ASSEMBLY,VALVE is a the manufacturer industrial component. Key specifications include material: ALUMINUM ALLOY, overall_width: 2.250 INCHES NOMINAL IN, overall_length: 2.250 INCHES NOMINAL IN, surface_treatment: ANODIZE, end_item_identification: SEAWOLF CLASS SSN.. This part is cataloged in the U.S.

Government catalog under NSN 4820-01-423-7635, 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
21556-400-1
NSN: 4820-01-423-7635
FSC: 4820 — Valves, Nonpowered
CAGE: 78062 — SARGENT AEROSPACE & DEFENSE, LLC DBA SARGENT CONTROLS & AEROSPACE DIV SARGENT CONTROLS & AEROSPACE (USA)
SPECIFICATIONS
materialALUMINUM ALLOY
overall_width2.250 INCHES NOMINAL IN
overall_length2.250 INCHES NOMINAL IN
surface_treatmentANODIZE
end_item_identificationSEAWOLF CLASS SSN.
NSN4820-01-423-7635
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: 21556-400-1 · 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
•
SURFACE TREATMENT: ANODIZE
•
MATERIAL: ALUMINUM ALLOY
TECHNICAL CHARACTERISTICS
OVERALL LENGTH2.250 INCHES NOMINAL IN
OVERALL WIDTH2.250 INCHES NOMINAL IN
SURFACE TREATMENTANODIZE
END ITEM IDENTIFICATIONSEAWOLF CLASS SSN.
MATERIALALUMINUM ALLOY
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
21556-400Reference document
Same NSN cross-reference
Reference document — Drawing number reference only
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 21556-400-1?
21556-400-1 is a SUBPLATE ASSEMBLY,VALVE.
What parts can replace 21556-400-1?
There is 1 known substitute for 21556-400-1: 21556-400. Substitute compatibility should be verified for your specific system.
What is the NSN for 21556-400-1?
21556-400-1 is cataloged in the U.S. Government catalog under NSN 4820-01-423-7635. 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.