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6553-256 — RETAINER,DISK,VALVE

✓ Government record, cited
— · GATE VALVE
PRODUCT OVERVIEW

6553-256: RETAINER,DISK,VALVE.

The RETAINER,DISK,VALVE is a the manufacturer industrial component. Key specifications include material: COPPER ALLOY, overall_length: 1.625 INCHES NOMINAL IN, nominal_thread_size: 2.875 INCHES IN, end_item_identification: NIMITZ CLASS CVN, valve_design_control_activity: 80064, valve_size_for_which_designed: 6.000 INCHES IN. This part is cataloged in the U.S.

Government catalog under NSN 4820-01-414-6615, 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
6553-256
NSN: 4820-01-414-6615
FSC: 4820 — Valves, Nonpowered
CAGE: 43689 — HUNTINGTON INGALLS INC DIV NEWPORT NEWS SHIPBUILDING (USA)
SPECIFICATIONS
materialCOPPER ALLOY
overall_length1.625 INCHES NOMINAL IN
nominal_thread_size2.875 INCHES IN
end_item_identificationNIMITZ CLASS CVN
valve_design_control_activity80064
valve_size_for_which_designed6.000 INCHES IN
material_document_and_classificationMIL-B-24059 AMEND 1 MIL SPEC SINGLE MATERIAL RESPONSE
NSN4820-01-414-6615
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: 6553-256 · 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 DOCUMENT AND CLASSIFICATION: MIL-B-24059 AMEND 1 MIL SPEC SINGLE MATERIAL RESPONSE
•
NOMINAL THREAD SIZE: 2.875 INCHES IN
•
VALVE SIZE FOR WHICH DESIGNED: 6.000 INCHES IN
•
VALVE DESIGN CONTROL ACTIVITY: 80064
•
MATERIAL: COPPER ALLOY
TECHNICAL CHARACTERISTICS
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-B-24059 AMEND 1 MIL SPEC SINGLE MATERIAL RESPONSE
OVERALL LENGTH1.625 INCHES NOMINAL IN
NOMINAL THREAD SIZE2.875 INCHES IN
VALVE SIZE FOR WHICH DESIGNED6.000 INCHES IN
VALVE DESIGN CONTROL ACTIVITY80064
END ITEM IDENTIFICATIONNIMITZ CLASS CVN
MATERIALCOPPER ALLOY
SUBSTITUTES & CROSS-REFERENCES 3
4325726Reference document
Same NSN cross-reference
Reference document — Drawing number reference only
6553-256 PART 6Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
208-4325726 PIEReference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
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 6553-256?
6553-256 is a RETAINER,DISK,VALVE.
What parts can replace 6553-256?
There are 3 known substitutes for 6553-256: 4325726, 6553-256 PART 6, 208-4325726 PIE. Substitute compatibility should be verified for your specific system.
What is the NSN for 6553-256?
6553-256 is cataloged in the U.S. Government catalog under NSN 4820-01-414-6615. 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.