PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

0N377879-2Reactor

National Security Agency · NSN 5950-01-243-8251 · FSC 5950 · No Item Name Available
Verified by PartsTable
NSN 5950-01-243-8251 — this item is cataloged by the U.S. Government under National Stock Number 5950-01-243-8251. Primary manufacturer part number: 0N377879-2.
Features
  • Reactor — FSC 5950
  • 2 verified cross-references
  • Primary manufacturer: National Security Agency
Applications
  • Industrial maintenance and repair
  • Government and military logistics
  • Equipment overhaul and refurbishment
General Description

The Reactor, cataloged under National Stock Number 5950-01-243-8251, is classified within Federal Supply Class 5950 (No Item Name Available) of the Electrical and Electronic Equipment Components group. The primary manufacturer of record is National Security Agency. This item has 2 commercial cross-references from 2 manufacturers, enabling identification through both NSN and commercial part number lookups. 4 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Catalog Facts
Item NameReactor
FSC / FSG5950 — No Item Name Available (FSG 59)
ManufacturersRobert M. Hadley Company, Inc. (CAGE 72964); National Security Agency (CAGE 98230)
Technical Specifications
ParameterValue
NSN5950-01-243-8251
Primary Part Number0N377879-2
Item NameReactor
FSC / FSG5950 / 59 — No Item Name Available
ManufacturerNational Security Agency
StatusACTIVE
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 4
2530-01-146-4607 INTERCHANGEABLE
Brake Shoe Set
4820-01-186-93752033914AS51SS INTERCHANGEABLE
Valve,safety Relief
Emerson Automation Solutions Final Control Us Lp Div Navy Product Team
4820-01-420-187820339 INTERCHANGEABLE
Seat,valve
Triumph Actuation Systems - Valencia, Inc. Dba Triumph Actuation Systems - Valencia Inc Div Triumph Actuation Systems-Val
5950-01-574-734520339 INTERCHANGEABLE
Transformer,power
Magnecomp, Inc.
Cross-Reference Index
Part NumberManufacturer
20339 Robert M. Hadley Company, Inc. (USA)
0N377879-2 PRIMARY National Security Agency (USA)
Related Parts
2530-01-146-4607INTERCHANGEABLE
BRAKE SHOE SET
4820-01-186-9375INTERCHANGEABLE
VALVE,SAFETY RELIEF
2033914AS51SS
4820-01-420-1878INTERCHANGEABLE
SEAT,VALVE
20339
5950-01-574-7345INTERCHANGEABLE
TRANSFORMER,POWER
20339

Frequently Asked Questions

What is NSN 5950-01-243-8251?

NSN 5950-01-243-8251 is a Reactor, manufactured by National Security Agency, classified under FSC 5950 (No Item Name Available). Status: active.

What are the part numbers for NSN 5950-01-243-8251?

NSN 5950-01-243-8251 has 2 cross-referenced part numbers: 20339 (Robert M. Hadley Company, Inc.), 0N377879-2 (National Security Agency).

What NSN replaces 5950-01-243-8251?

There are 4 known substitutes for 5950-01-243-8251: 2530-01-146-4607, 4820-01-186-9375, 4820-01-420-1878 and 1 more. Verify interchangeability with system specifications before substitution.

Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
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