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6820556-3 — SEAT,VALVE

✓ Government record, cited
— · GATE VALVE
PRODUCT OVERVIEW

6820556-3: SEAT,VALVE.

The SEAT,VALVE is a the manufacturer industrial component. Key specifications include material: COPPER ALLOY OVERALL, seat_radius: 0.218 INCHES NOMINAL IN, overall_height: 0.170 INCHES MINIMUM AND 0.190 INCHES MAXIMUM IN, style_designator: PLAIN, body_inside_diameter: 0.344 INCHES MINIMUM AND 0.346 INCHES MAXIMUM IN, body_outside_diameter: 0.661 INCHES MINIMUM AND 0.662 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 4820-01-186-4718, 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
6820556-3
NSN: 4820-01-186-4718
FSC: 4820 — Valves, Nonpowered
CAGE: 63005 — ROLLS-ROYCE CORPORATION (USA)
SPECIFICATIONS
materialCOPPER ALLOY OVERALL
seat_radius0.218 INCHES NOMINAL IN
overall_height0.170 INCHES MINIMUM AND 0.190 INCHES MAXIMUM IN
style_designatorPLAIN
body_inside_diameter0.344 INCHES MINIMUM AND 0.346 INCHES MAXIMUM IN
body_outside_diameter0.661 INCHES MINIMUM AND 0.662 INCHES MAXIMUM IN
seating_surface_shapeRADIAL
material_document_and_classificationAMS4640 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
NSN4820-01-186-4718
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: 6820556-3 · 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: 0.661 INCHES MINIMUM AND 0.662 INCHES MAXIMUM IN
•
STYLE DESIGNATOR: PLAIN
•
MATERIAL DOCUMENT AND CLASSIFICATION: AMS4640 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
•
BODY INSIDE DIAMETER: 0.344 INCHES MINIMUM AND 0.346 INCHES MAXIMUM IN
•
SEAT RADIUS: 0.218 INCHES NOMINAL IN
•
MATERIAL: COPPER ALLOY OVERALL
•
SEATING SURFACE SHAPE: RADIAL
TECHNICAL CHARACTERISTICS
OVERALL HEIGHT0.170 INCHES MINIMUM AND 0.190 INCHES MAXIMUM IN
BODY OUTSIDE DIAMETER0.661 INCHES MINIMUM AND 0.662 INCHES MAXIMUM IN
STYLE DESIGNATORPLAIN
MATERIAL DOCUMENT AND CLASSIFICATIONAMS4640 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
BODY INSIDE DIAMETER0.344 INCHES MINIMUM AND 0.346 INCHES MAXIMUM IN
SEAT RADIUS0.218 INCHES NOMINAL IN
MATERIALCOPPER ALLOY OVERALL
SEATING SURFACE SHAPERADIAL
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

No substitute or cross-reference records for this part.

LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 6820556-3?
6820556-3 is a SEAT,VALVE.
What is the NSN for 6820556-3?
6820556-3 is cataloged in the U.S. Government catalog under NSN 4820-01-186-4718. 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.