PartsTable TECHNICAL DATA SHEET

NSN 4820-01-377-3890Government record, cited

Seat, Valve4820-01-377-3890

NSN 4820-01-377-3890 · NIIN 013773890 · Part number 211055673

Naval Sea Systems Command · FSC 4820 — Valves, Nonpowered · FSG 48 — Valves · CAGE 53711

Government record, cited

NSN 4820-01-377-3890 — this item is cataloged by the U.S. Government under National Stock Number 4820-01-377-3890. Manufacturer of record part number: 211055673.

Also searched as 4820-01-377-3890 · 4820013773890 · NIIN 013773890 · 01-377-3890 · FSC 4820 Valves, Nonpowered · CAGE 53711 · 211055673 · DF330644 · DF330644 FN-64 · 6408784 · 801-6408784-64

Nearby stock numbers ← 4820-01-377-3889 Stem, Fluid Valve · 4820-01-377-3893 Valve, Linear, Directional Control →

4820-01-377-3890 — Valves, Nonpowered

Features

Seat,valve — FSC 4820
Material: PLASTIC POLYTETRAFLUOROETHYLENE SEAT
3 manufacturer part numbers on file
Manufacturer of record: Naval Sea Systems Command

Identification

NSN: 4820-01-377-3890
NIIN: 013773890
FSC: 4820 — Valves, Nonpowered
FSG: 48 — Valves
Primary part number: 211055673
Manufacturer: Naval Sea Systems Command

General Description

The Seat,valve, cataloged under National Stock Number 4820-01-377-3890, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Naval Sea Systems Command. Government technical data includes 1 specification, cited from the U.S. Government catalog. The record lists 3 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 8 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.

Technical Specifications

Parameter	Value
NSN	4820-01-377-3890
Primary Part Number	211055673
Item Name	Seat,valve
FSC / FSG	4820 / 48 — Valves, Nonpowered
Manufacturer	Naval Sea Systems Command
Status	ACTIVE
Material	PLASTIC POLYTETRAFLUOROETHYLENE SEAT

Lifecycle & Compliance

Acquisition Status	ACTIVE
DEMIL Code	DEMIL A — No Demilitarization Required
Hazard	No hazard code in the DLA record (HMIC N)
Criticality Code	X

⇄ Related Items 8

Each row states its source: a government interchangeability/replacement code, or a possible match on a shared part number.

4820-01-377-4606211055796 POSSIBLE MATCH

LUG,VALVE HANDLE

Possible match (shared part number)Naval Sea Systems Command

4820-01-415-6620211081797 POSSIBLE MATCH

STEM,FLUID VALVE

Possible match (shared part number)Naval Sea Systems Command

4820-01-415-6622211081781 POSSIBLE MATCH

VALVE,BALL

Possible match (shared part number)Naval Sea Systems Command

4820-01-415-6628211055808 POSSIBLE MATCH

CAP,VALVE

Possible match (shared part number)Naval Sea Systems Command

4820-01-415-8288801-6408784-AY81 POSSIBLE MATCH

VALVE,BALL

Possible match (shared part number)Naval Sea Systems Command

4820-01-415-8290801-6408784-AY78 POSSIBLE MATCH

VALVE,BALL

Possible match (shared part number)Naval Sea Systems Command

4820-01-415-8291801-6408784 FIND 219 POSSIBLE MATCH

STEM,FLUID VALVE

Possible match (shared part number)Naval Sea Systems Command

4820-01-415-8292801-6408784 FIND 68 POSSIBLE MATCH

CAP,VALVE

Possible match (shared part number)Naval Sea Systems Command

Cross-Reference Index

Part Number	Manufacturer
211055673 PRIMARY	Naval Sea Systems Command (USA)
DF330644 FN-64	Huntington Ingalls Inc Div Newport News Shipbuilding (USA)
801-6408784-64	Naval Sea Systems Command (USA)

Reference documents

Reference	Meaning
DF330644	D/9 Drawing number reference only Huntington Ingalls Inc Div Newport News Shipbuilding
6408784	D/9 Drawing number reference only Naval Sea Systems Command

Related Parts

4820-01-377-4606POSSIBLE MATCH

LUG,VALVE HANDLE

211055796

4820-01-415-6620POSSIBLE MATCH

STEM,FLUID VALVE

211081797

4820-01-415-6622POSSIBLE MATCH

VALVE,BALL

211081781

4820-01-415-6628POSSIBLE MATCH

CAP,VALVE

211055808

4820-01-415-8288POSSIBLE MATCH

VALVE,BALL

801-6408784-AY81

4820-01-415-8290POSSIBLE MATCH

VALVE,BALL

801-6408784-AY78

4820-01-415-8291POSSIBLE MATCH

STEM,FLUID VALVE

801-6408784 FIND 219

4820-01-415-8292POSSIBLE MATCH

CAP,VALVE

801-6408784 FIND 68

Frequently Asked Questions

What is NSN 4820-01-377-3890?

NSN 4820-01-377-3890 is a Seat,valve, manufactured by Naval Sea Systems Command, classified under FSC 4820, Valves, Nonpowered. Status: active.

What part numbers are listed for NSN 4820-01-377-3890?

NSN 4820-01-377-3890 has 3 manufacturer part numbers on file: 211055673 (Naval Sea Systems Command), DF330644 FN-64 (Huntington Ingalls Inc Div Newport News Shipbuilding), 801-6408784-64 (Naval Sea Systems Command).

What NSN replaces 4820-01-377-3890?

8 possible matches (shared part number, not a government interchangeability claim): 4820-01-377-4606, 4820-01-415-6620, 4820-01-415-6622. Verify interchangeability with system specifications before substitution.

What are the specifications of 211055673?

Key specifications for 211055673: Special Features: 2.928 IN. OD BY 1.938 IN. ID; 0.375 IN. THK IN; Material: PLASTIC POLYTETRAFLUOROETHYLENE SEAT. 1 specification is documented in the U.S. Government catalog.

Is NSN 4820-01-377-3890 hazardous material?

No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.

Sources

U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.

U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.

✓ Data cited from the U.S. Government catalog; commercial cross-references from OEM and certified industry sources.

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