PartsTable TECHNICAL DATA SHEET

NSN 4820-01-199-5756Government record, cited

Socket, Valve4820-01-199-5756

NSN 4820-01-199-5756 · NIIN 011995756

FSC 4820 — Valves, Nonpowered · FSG 48 — Valves

Government record, cited

Also searched as 4820-01-199-5756 · 4820011995756 · NIIN 011995756 · 01-199-5756 · FSC 4820 Valves, Nonpowered · 2641-809-40 · 88651301B1 ITEM F29 · 2641-809-40 ITEM 81

Nearby stock numbers ← 4820-01-199-5755 Adapter, Valve · 4820-01-199-5757 Subplate Assembly, Valve →

4820-01-199-5756 — Valves, Nonpowered

Features

Socket,valve — FSC 4820
General Characteristics Item Description: MATERIAL CRES QQ-S-763 CL 304 COND A; 2.500 IN. O/A LG; 1.250 IN. OD; FIRST END IS OCTACONAL INSIDE 2.000 IN. LG W/1.030 IN. ACROSS FLATS; SECOND END IS 0.700 IN. SQUARE 0.500 IN. LG; ENDS WELDED TOGETHER IN

Identification

NSN: 4820-01-199-5756
NIIN: 011995756
FSC: 4820 — Valves, Nonpowered
FSG: 48 — Valves

General Description

The Socket,valve, cataloged under National Stock Number 4820-01-199-5756, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 1 specification, cited from the U.S. Government catalog. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 6 items share a part number with this NSN in the catalog (possible match — not a government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	4820-01-199-5756
Item Name	Socket,valve
FSC / FSG	4820 / 48 — Valves, Nonpowered
Status	ACTIVE
General Characteristics Item Description	MATERIAL CRES QQ-S-763 CL 304 COND A; 2.500 IN. O/A LG; 1.250 IN. OD; FIRST END IS OCTACONAL INSIDE 2.000 IN. LG W/1.030 IN. ACROSS FLATS; SECOND END IS 0.700 IN. SQUARE 0.500 IN. LG; ENDS WELDED TOGETHER IN

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.

5330-01-389-2702 POSSIBLE MATCH

RETAINER,PACKING

Possible match (shared part number)

5310-01-474-8822845-7285244 ITEM 56 POSSIBLE MATCH

WASHER,FLAT

Possible match (shared part number)Naval Sea Systems Command

5310-01-474-8828 POSSIBLE MATCH

WASHER,FLAT

Possible match (shared part number)

4820-01-482-50542641-809-40 ITEM 55 POSSIBLE MATCH

RETAINER,SEAT,VALVE

Possible match (shared part number)Electric Boat Corporation Div General Dynamics Electric Boat

5360-01-598-4607 POSSIBLE MATCH

SPRING,FLAT

Possible match (shared part number)

5310-01-673-8082264140501-035CP POSSIBLE MATCH

WASHER BLANK

Possible match (shared part number)Electric Boat Corporation Div General Dynamics Electric Boat

Cross-Reference Index

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

Reference documents

Reference	Meaning
2641-809-40	D/9 Drawing number reference only U.S. Government activity
88651301B1 ITEM F29	5/2 Secondary reference U.S. Government activity
2641-809-40 ITEM 81	3/2 Design control — primary reference U.S. Government activity

Related Parts

5330-01-389-2702POSSIBLE MATCH

RETAINER,PACKING

5310-01-474-8822POSSIBLE MATCH

WASHER,FLAT

845-7285244 ITEM 56

5310-01-474-8828POSSIBLE MATCH

WASHER,FLAT

4820-01-482-5054POSSIBLE MATCH

RETAINER,SEAT,VALVE

2641-809-40 ITEM 55

5360-01-598-4607POSSIBLE MATCH

SPRING,FLAT

5310-01-673-8082POSSIBLE MATCH

WASHER BLANK

264140501-035CP

Frequently Asked Questions

What is NSN 4820-01-199-5756?

NSN 4820-01-199-5756 is a Socket,valve, classified under FSC 4820, Valves, Nonpowered. Status: active.

What NSN replaces 4820-01-199-5756?

6 possible matches (shared part number, not a government interchangeability claim): 5330-01-389-2702, 5310-01-474-8822, 5310-01-474-8828. Verify interchangeability with system specifications before substitution.

What are the specifications of 4820-01-199-5756?

Key specifications for 4820-01-199-5756: General Characteristics Item Description: MATERIAL CRES QQ-S-763 CL 304 COND A; 2.500 IN. O/A LG; 1.250 IN. OD; FIRST END IS OCTACONAL INSIDE 2.000 IN. LG W/1.030 IN. ACROSS FLATS; SECOND END IS 0.700 IN. SQUARE 0.500 IN. LG; ENDS WELDED TOGETHER IN. 1 specification is documented in the U.S. Government catalog.

Is NSN 4820-01-199-5756 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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