Bellows Assembly, Valve, Thermosta4820-01-560-9399

NSN 4820-01-560-9399 · NIIN 015609399 · Part number 50M-203-50S

Metrex Valve Corp. Dba Metrex Valve Corp · FSC 4820 — Valves, Nonpowered · FSG 48 — Valves · CAGE 21013

Government record, cited

NSN 4820-01-560-9399 — this item is cataloged by the U.S. Government under National Stock Number 4820-01-560-9399. Manufacturer of record part number: 50M-203-50S.

Also searched as 4820-01-560-9399 · 4820015609399 · NIIN 015609399 · 01-560-9399 · FSC 4820 Valves, Nonpowered · CAGE 21013 · 50M-203-50S

Nearby stock numbers ← 4820-01-560-9388 Valve, Check · 4820-01-560-9973 Valve, Spring Globe →

4820-01-560-9399 — Valves, Nonpowered

Features

Bellows Assembly,valve,thermosta — FSC 4820
Material: NICKEL ALLOY AND COPPER ALLOY
Type/model Designation: MODEL 203
1 manufacturer part number on file
Manufacturer of record: Metrex Valve Corp. Dba Metrex Valve Corp

Identification

NSN: 4820-01-560-9399
NIIN: 015609399
FSC: 4820 — Valves, Nonpowered
FSG: 48 — Valves
Primary part number: 50M-203-50S
Manufacturer: Metrex Valve Corp. Dba Metrex Valve Corp

General Description

The Bellows Assembly,valve,thermosta, cataloged under National Stock Number 4820-01-560-9399, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Metrex Valve Corp. Dba Metrex Valve Corp. Government technical data includes 2 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	4820-01-560-9399
Primary Part Number	50M-203-50S
Item Name	Bellows Assembly,valve,thermosta
FSC / FSG	4820 / 48 — Valves, Nonpowered
Manufacturer	Metrex Valve Corp. Dba Metrex Valve Corp
Status	ACTIVE
Material	NICKEL ALLOY AND COPPER ALLOY
Type/model Designation	MODEL 203

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
50M-203-50S PRIMARY	Metrex Valve Corp. Dba Metrex Valve Corp (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 4820-01-560-9399?

NSN 4820-01-560-9399 is a Bellows Assembly,valve,thermosta, manufactured by Metrex Valve Corp. Dba Metrex Valve Corp, classified under FSC 4820, Valves, Nonpowered. Status: active.

What part numbers are listed for NSN 4820-01-560-9399?

NSN 4820-01-560-9399 has 1 manufacturer part number on file: 50M-203-50S (Metrex Valve Corp. Dba Metrex Valve Corp).

What are the specifications of 50M-203-50S?

Key specifications for 50M-203-50S: Special Features: ASSEMBLY INCLUDES REFRIGERENT CONNECTION 36 INCH LONG CAPILLARY TUBE WITH 1/4-INCH SAE FLANGE NUT CONNECTION; TEMPERATURE RANGE 90-140 DEG F, SET TEMP 120 DEG; APPLICATION: SALT WATER COOLING/11KW HYDRAULIC POWER UNIT IN; Part Name Assigned by Controlling Agency: BELLOWS ASSEMBLY; End Item Identification: 4820-01-561-1771 REGULATING VALVE; NEW CONSTRUCTION LCS1; Material: NICKEL ALLOY AND COPPER ALLOY. 2 specifications are documented in the U.S. Government catalog.

Is NSN 4820-01-560-9399 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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