Disk, Valve4820-01-558-3971

NSN 4820-01-558-3971 · NIIN 015583971

FSC 4820 — Valves, Nonpowered · FSG 48 — Valves

Government record, cited

Also searched as 4820-01-558-3971 · 4820015583971 · NIIN 015583971 · 01-558-3971 · FSC 4820 Valves, Nonpowered · 803-2177525-S5XX-80 · 803-2177525-M5XX-80

Nearby stock numbers ← 4820-01-558-3764 Valve, Check · 4820-01-558-3975 Valve, Regulating, Fluid Pressure →

4820-01-558-3971 — Valves, Nonpowered

Features

Disk,valve — FSC 4820
Shoulder Width: 0.080 INCHES MINIMUM IN
Shoulder Height: 0.025 INCHES MINIMUM IN
Style Designator: PLUG
Material Document and Classification: MIL-C-24252. COND CA-7 MIL SPEC SINGLE MATERIAL RESPONSE
Seat Angle: 31.0 DEGREES NOMINAL
Media for Which Designed: WATER OR OIL OR GAS
Thread Class: 2A A

Identification

NSN: 4820-01-558-3971
NIIN: 015583971
FSC: 4820 — Valves, Nonpowered
FSG: 48 — Valves

General Description

The Disk,valve, cataloged under National Stock Number 4820-01-558-3971, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 10 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.

Technical Specifications

Parameter	Value
NSN	4820-01-558-3971
Item Name	Disk,valve
FSC / FSG	4820 / 48 — Valves, Nonpowered
Status	ACTIVE
Shoulder Width	0.080 INCHES MINIMUM IN
Shoulder Height	0.025 INCHES MINIMUM IN
Style Designator	PLUG
Material Document and Classification	MIL-C-24252. COND CA-7 MIL SPEC SINGLE MATERIAL RESPONSE
Seat Angle	31.0 DEGREES NOMINAL
Media for Which Designed	WATER OR OIL OR GAS
Thread Class	2A A
Thread Quantity Per Inch	16
Material	COBALT ALLOY AND TUNGSTEN AND NICKEL ALLOY
Thread Series Designator	UN

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

Cross-Reference Index

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

Reference documents

Reference	Meaning
803-2177525-S5XX-80	3/2 Design control — primary reference U.S. Government activity
803-2177525-M5XX-80	5/2 Secondary reference U.S. Government activity

No interchangeability data on file.

Other items in FSC 4820 — Valves, Nonpowered

Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.

4820-00-000-0097

4820-00-000-0097 · Item name not on file

4820-00-001-0010

VALVE,ROTARY,SELECTOR

4820-00-001-0020

4820-00-001-0020 · Item name not on file

4820-00-001-0021

4820-00-001-0021 · Item name not on file

4820-00-001-0032

4820-00-001-0032 · Item name not on file

4820-00-001-0037

VALVE,SAFETY RELIEF

4820-00-001-0042

4820-00-001-0042 · Item name not on file

4820-00-001-1230

4820-00-001-1230 · Item name not on file

Frequently Asked Questions

What is NSN 4820-01-558-3971?

NSN 4820-01-558-3971 is a Disk,valve, classified under FSC 4820, Valves, Nonpowered. Status: active.

What are the specifications of 4820-01-558-3971?

Key specifications for 4820-01-558-3971: Overall Height: 1.420 INCHES NOMINAL IN; Shoulder Width: 0.080 INCHES MINIMUM IN; Shoulder Height: 0.025 INCHES MINIMUM IN; Style Designator: PLUG. 10 specifications are documented in the U.S. Government catalog.

Is NSN 4820-01-558-3971 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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