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556-6408589-7 — SEAT,VALVE

✓ Government record, cited
— · GATE VALVE
PRODUCT OVERVIEW

556-6408589-7: SEAT,VALVE.

The SEAT,VALVE is a the manufacturer industrial component. Key specifications include material: PLASTIC POLYAMIDE NYLON OVERALL, seat_radius: 0.344 INCHES NOMINAL IN, overall_height: 0.258 INCHES NOMINAL IN, style_designator: PLAIN, body_inside_diameter: 0.375 INCHES NOMINAL IN, body_outside_diameter: 0.876 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 4820-01-350-0201, 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
556-6408589-7
NSN: 4820-01-350-0201
FSC: 4820 — Valves, Nonpowered
CAGE: 53711 — NAVAL SEA SYSTEMS COMMAND (USA)
SPECIFICATIONS
materialPLASTIC POLYAMIDE NYLON OVERALL
seat_radius0.344 INCHES NOMINAL IN
overall_height0.258 INCHES NOMINAL IN
style_designatorPLAIN
body_inside_diameter0.375 INCHES NOMINAL IN
body_outside_diameter0.876 INCHES NOMINAL IN
seating_surface_shapeRADIAL
NSN4820-01-350-0201
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: 556-6408589-7 · 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
•
BODY OUTSIDE DIAMETER: 0.876 INCHES NOMINAL IN
•
STYLE DESIGNATOR: PLAIN
•
BODY INSIDE DIAMETER: 0.375 INCHES NOMINAL IN
•
SEAT RADIUS: 0.344 INCHES NOMINAL IN
•
MATERIAL: PLASTIC POLYAMIDE NYLON OVERALL
•
SEATING SURFACE SHAPE: RADIAL
TECHNICAL CHARACTERISTICS
OVERALL HEIGHT0.258 INCHES NOMINAL IN
BODY OUTSIDE DIAMETER0.876 INCHES NOMINAL IN
STYLE DESIGNATORPLAIN
BODY INSIDE DIAMETER0.375 INCHES NOMINAL IN
SEAT RADIUS0.344 INCHES NOMINAL IN
MATERIALPLASTIC POLYAMIDE NYLON OVERALL
SEATING SURFACE SHAPERADIAL
SUBSTITUTES & CROSS-REFERENCES 2
DF330661 ITEM 7Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
556-6408589Reference document
Same NSN cross-reference
Reference document — Drawing number reference only
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 556-6408589-7?
556-6408589-7 is a SEAT,VALVE.
What parts can replace 556-6408589-7?
There are 2 known substitutes for 556-6408589-7: DF330661 ITEM 7, 556-6408589. Substitute compatibility should be verified for your specific system.
What is the NSN for 556-6408589-7?
556-6408589-7 is cataloged in the U.S. Government catalog under NSN 4820-01-350-0201. 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.