PartsTable TECHNICAL DATA SHEET

NSN 4820-01-487-5258Government record, cited

Seat, Valve4820-01-487-5258

NSN 4820-01-487-5258 · NIIN 014875258

FSC 4820 — Valves, Nonpowered · FSG 48 — Valves

Government record, cited

Also searched as 4820-01-487-5258 · 4820014875258 · NIIN 014875258 · 01-487-5258 · FSC 4820 Valves, Nonpowered · V2D12147-1 · V1E10565 · V1E10565 ITEM 19

Nearby stock numbers ← 4820-01-487-5239 Disk, Valve · 4820-01-487-5259 Retainer, Seat, Valve →

4820-01-487-5258 — Valves, Nonpowered

Features

Seat,valve — FSC 4820
Seal Accommodation Type: GROOVED
Material Document and Classification: 6/12 ANNEALED L+410/ASTM-D4066 ASSN STD SINGLE MATERIAL RESPONSE SEAT
Material: PLASTIC POLYAMIDE NYLON SEAT

Identification

NSN: 4820-01-487-5258
NIIN: 014875258
FSC: 4820 — Valves, Nonpowered
FSG: 48 — Valves

General Description

The Seat,valve, cataloged under National Stock Number 4820-01-487-5258, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 3 specifications, cited from the U.S. Government catalog. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 6 items share a part number with this NSN in the catalog (possible match — not a government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	4820-01-487-5258
Item Name	Seat,valve
FSC / FSG	4820 / 48 — Valves, Nonpowered
Status	ACTIVE
Seal Accommodation Type	GROOVED
Material Document and Classification	6/12 ANNEALED L+410/ASTM-D4066 ASSN STD SINGLE MATERIAL RESPONSE SEAT
Material	PLASTIC POLYAMIDE NYLON 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 6

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

4820-01-487-5259V2D12152-1 POSSIBLE MATCH

RETAINER,SEAT,VALVE

Possible match (shared part number)Vacco Industries

3120-01-487-6290V1E10565 ITEM 17 POSSIBLE MATCH

BEARING,SLEEVE

Possible match (shared part number)Vacco Industries

3120-01-487-6294 POSSIBLE MATCH

BEARING,SLEEVE

Possible match (shared part number)

3120-01-487-6298V1E10565 ITEM 32 POSSIBLE MATCH

BEARING,SLEEVE

Possible match (shared part number)Vacco Industries

5330-01-487-6589V2D12143-1 POSSIBLE MATCH

RETAINER,SEAL

Possible match (shared part number)Vacco Industries

3120-01-488-9683V1E10565 ITEM 15 POSSIBLE MATCH

BEARING,SLEEVE

Possible match (shared part number)Vacco Industries

Cross-Reference Index

No manufacturer part numbers on file in the U.S. Government catalog.

Reference documents

Reference	Meaning
V2D12147-1	3/2 Design control — primary reference U.S. Government activity
V1E10565	D/9 Drawing number reference only U.S. Government activity
V1E10565 ITEM 19	5/2 Secondary reference U.S. Government activity

Related Parts

4820-01-487-5259POSSIBLE MATCH

RETAINER,SEAT,VALVE

V2D12152-1

3120-01-487-6290POSSIBLE MATCH

BEARING,SLEEVE

V1E10565 ITEM 17

3120-01-487-6294POSSIBLE MATCH

BEARING,SLEEVE

3120-01-487-6298POSSIBLE MATCH

BEARING,SLEEVE

V1E10565 ITEM 32

5330-01-487-6589POSSIBLE MATCH

RETAINER,SEAL

V2D12143-1

3120-01-488-9683POSSIBLE MATCH

BEARING,SLEEVE

V1E10565 ITEM 15

Frequently Asked Questions

What is NSN 4820-01-487-5258?

NSN 4820-01-487-5258 is a Seat,valve, classified under FSC 4820, Valves, Nonpowered. Status: active.

What NSN replaces 4820-01-487-5258?

6 possible matches (shared part number, not a government interchangeability claim): 4820-01-487-5259, 3120-01-487-6290, 3120-01-487-6294. Verify interchangeability with system specifications before substitution.

What are the specifications of 4820-01-487-5258?

Key specifications for 4820-01-487-5258: Seal Accommodation Type: GROOVED; Material Document and Classification: 6/12 ANNEALED L+410/ASTM-D4066 ASSN STD SINGLE MATERIAL RESPONSE SEAT; Special Features: GOES ON NSN 4820-01-487-5108 SAFETY RELIEF VALVE; NHA FLOWMETER 0-2; End Item Identification: LOS ANGELES CLASS SSN (688). 3 specifications are documented in the U.S. Government catalog.

Is NSN 4820-01-487-5258 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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