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6556655 — DISK,VALVE

✓ Government record, cited
— · GATE VALVE
PRODUCT OVERVIEW

6556655: DISK,VALVE.

The DISK,VALVE is a the manufacturer industrial component. Key specifications include material: COPPER ALLOY, plug_design: CYLINDRICAL, thread_class: 3A SINGLE THREADED PORTION A, thread_length: 0.752 INCHES NOMINAL SINGLE THREADED PORTION IN, overall_height: 1.250 INCHES NOMINAL IN, flange_diameter: 5.750 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 4820-01-441-9002, 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
6556655
NSN: 4820-01-441-9002
NIINs: 014419002, 014420424, 014420439, 014420749, 014420793
FSC: 4820 — Valves, Nonpowered
CAGE: 53711 — NAVAL SEA SYSTEMS COMMAND (USA)
SPECIFICATIONS
materialCOPPER ALLOY
plug_designCYLINDRICAL
thread_class3A SINGLE THREADED PORTION A
thread_length0.752 INCHES NOMINAL SINGLE THREADED PORTION IN
overall_height1.250 INCHES NOMINAL IN
flange_diameter5.750 INCHES NOMINAL IN
hardness_rating115.0 ROCKWELL R NOMINAL SEAT
inside_diameter4.200 INCHES NOMINAL IN
shoulder_height0.500 INCHES NOMINAL IN
outside_diameter2.500 INCHES NOMINAL IN
special_featuresA/K/A SEAT UPPER
style_designatorPLAIN FLANGED
NSN4820-01-441-9002
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: 6556655 · 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
•
MATERIAL: COPPER ALLOY
•
PLUG DESIGN: CYLINDRICAL
TECHNICAL CHARACTERISTICS
END ITEM IDENTIFICATIONSEAWOLF CLASS SSN
MATERIALCOPPER ALLOY
PLUG DESIGNCYLINDRICAL
SUBSTITUTES & CROSS-REFERENCES 3
801-6556655-A9Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
2643-1002-63A9Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
801-6556655 FIND A9Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
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 6556655?
6556655 is a DISK,VALVE.
What parts can replace 6556655?
There are 3 known substitutes for 6556655: 801-6556655-A9, 2643-1002-63A9, 801-6556655 FIND A9. Substitute compatibility should be verified for your specific system.
What is the NSN for 6556655?
6556655 is cataloged in the U.S. Government catalog under NSN 4820-01-441-9002. 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.