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256348 PIECE 16 — RETAINER,SEAL

✓ Government record, cited
— · GATE VALVE
PRODUCT OVERVIEW

256348 PIECE 16: RETAINER,SEAL.

The RETAINER,SEAL is a the manufacturer industrial component. Key specifications include end_item_identification: VALVE B COMBN 4.00IPS FLGE CUNI, criticality_code_justification: ZZZY. This part is cataloged in the U.S.

Government catalog under NSN 4820-01-207-4858, 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
256348 PIECE 16
NSN: 4820-01-207-4858
NIINs: 012074858, 014078681
FSC: 4820 — Valves, Nonpowered
CAGE: 43689 — HUNTINGTON INGALLS INC DIV NEWPORT NEWS SHIPBUILDING (USA)
SPECIFICATIONS
end_item_identificationVALVE B COMBN 4.00IPS FLGE CUNI
criticality_code_justificationZZZY
reference_number_differentiating_characteristicsITEMS THAT SUPPORT A LEVEL 1 OR SUBSAFE CRITICAL SYSTEM THAT HAS UNDERGONE QUALITY ASSURANCE DURING THE ACQUISITION PROCESS
NSN4820-01-207-4858
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: 256348 PIECE 16 · 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
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GENERAL CHARACTERISTICS ITEM DESCRIPTION: MATERIAL IS NI-CU,QQ-N-281,CLASSA
TECHNICAL CHARACTERISTICS
GENERAL CHARACTERISTICS ITEM DESCRIPTIONMATERIAL IS NI-CU,QQ-N-281,CLASSA
SUBSTITUTES & CROSS-REFERENCES

No substitute or cross-reference records for this part.

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 256348 PIECE 16?
256348 PIECE 16 is a RETAINER,SEAL.
What is the NSN for 256348 PIECE 16?
256348 PIECE 16 is cataloged in the U.S. Government catalog under NSN 4820-01-207-4858. 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.