Disk, Valve4820-01-004-0791

NSN 4820-01-004-0791 · NIIN 010040791 · Part number 211999C

Twin Disc, Incorporated Dba Twin Disc Mid-Atlantic · FSC 4820 — Valves, Nonpowered · FSG 48 — Valves · CAGE 61208

Government record, cited

NSN 4820-01-004-0791 — this item is cataloged by the U.S. Government under National Stock Number 4820-01-004-0791. Manufacturer of record part number: 211999C.

Also searched as 4820-01-004-0791 · 4820010040791 · NIIN 010040791 · 01-004-0791 · FSC 4820 Valves, Nonpowered · CAGE 61208 · 211999C

Nearby stock numbers ← 4820-01-004-0774 Valve, Check · 4820-01-004-0792 →

4820-01-004-0791 — Valves, Nonpowered

Features

Disk,valve — FSC 4820
Shank Diameter: 0.373 INCHES NOMINAL IN
Flange Seat to Disk End Height: 1.100 INCHES NOMINAL IN
Flange Diameter: 0.748 INCHES NOMINAL IN
Style Designator: POPPET
Seat Angle: 30.0 DEGREES NOMINAL
Inside Diameter: 0.248 INCHES NOMINAL IN
Material: ALUMINUM ALLOY

Identification

NSN: 4820-01-004-0791
NIIN: 010040791
FSC: 4820 — Valves, Nonpowered
FSG: 48 — Valves
Primary part number: 211999C
Manufacturer: Twin Disc, Incorporated Dba Twin Disc Mid-Atlantic

General Description

The Disk,valve, cataloged under National Stock Number 4820-01-004-0791, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Twin Disc, Incorporated Dba Twin Disc Mid-Atlantic. Government technical data includes 7 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. Current acquisition status: Active.

Technical Specifications

Parameter	Value
NSN	4820-01-004-0791
Primary Part Number	211999C
Item Name	Disk,valve
FSC / FSG	4820 / 48 — Valves, Nonpowered
Manufacturer	Twin Disc, Incorporated Dba Twin Disc Mid-Atlantic
Status	ACTIVE
Shank Diameter	0.373 INCHES NOMINAL IN
Flange Seat to Disk End Height	1.100 INCHES NOMINAL IN
Flange Diameter	0.748 INCHES NOMINAL IN
Style Designator	POPPET
Seat Angle	30.0 DEGREES NOMINAL
Inside Diameter	0.248 INCHES NOMINAL IN
Material	ALUMINUM ALLOY

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

Part Number	Manufacturer
211999C PRIMARY	Twin Disc, Incorporated Dba Twin Disc Mid-Atlantic (USA)

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 4820-01-004-0791?

NSN 4820-01-004-0791 is a Disk,valve, manufactured by Twin Disc, Incorporated Dba Twin Disc Mid-Atlantic, classified under FSC 4820, Valves, Nonpowered. Status: active.

What part numbers are listed for NSN 4820-01-004-0791?

NSN 4820-01-004-0791 has 1 manufacturer part number on file: 211999C (Twin Disc, Incorporated Dba Twin Disc Mid-Atlantic).

What are the specifications of 211999C?

Key specifications for 211999C: Shank Diameter: 0.373 INCHES NOMINAL IN; Flange Seat to Disk End Height: 1.100 INCHES NOMINAL IN; Flange Diameter: 0.748 INCHES NOMINAL IN; Overall Height: 1.700 INCHES NOMINAL IN. 7 specifications are documented in the U.S. Government catalog.

Is NSN 4820-01-004-0791 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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