PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

M25666/1Converter,liquid Oxygen

Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M · NSN 1660-00-540-5306 · FSC 1660 · No Item Name Available
Verified by PartsTable
NSN 1660-00-540-5306 — this item is cataloged by the U.S. Government under National Stock Number 1660-00-540-5306. Primary manufacturer part number: M25666/1.
Features
  • Converter,liquid Oxygen — FSC 1660
  • FSC Application Data: OXYGEN BREATHING SYSTEM,ACFT
  • General Characteristics Item Description: 70 PSI,OPERATING PRESSURE; AMBIENT AIR HEATED METHOD OF OXYGEN WARMING; 10 L PER MIN,OUTPUT CAPACITY; W/PRESSURE OPENING-PRESSURE CLOSING VALVE; 1 RELIEF VALVE; W/CHECK VALVE; W/PRESSURE GAGE; W/CAPACITANCE GAGING ELEMENT; BRACKET MTG; OVER-ALL DIMENSIONS,12.82 IN. LG,12.88 IN. DIA; W/O SPARE PARTS IN
  • 5 verified cross-references
  • Primary manufacturer: Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
Applications
  • Industrial maintenance and repair
  • Government and military logistics
  • Equipment overhaul and refurbishment
General Description

The Converter,liquid Oxygen, cataloged under National Stock Number 1660-00-540-5306, is classified within Federal Supply Class 1660 (No Item Name Available) of the Aircraft Components and Accessories group. The primary manufacturer of record is Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M. Government technical data includes 2 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 5 commercial cross-references from 2 manufacturers, enabling identification through both NSN and commercial part number lookups. 3 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN1660-00-540-5306
Primary Part NumberM25666/1
Item NameConverter,liquid Oxygen
FSC / FSG1660 / 16 — No Item Name Available
ManufacturerMilitary Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
StatusACTIVE
FSC Application DataOXYGEN BREATHING SYSTEM,ACFT
General Characteristics Item Description70 PSI,OPERATING PRESSURE; AMBIENT AIR HEATED METHOD OF OXYGEN WARMING; 10 L PER MIN,OUTPUT CAPACITY; W/PRESSURE OPENING-PRESSURE CLOSING VALVE; 1 RELIEF VALVE; W/CHECK VALVE; W/PRESSURE GAGE; W/CAPACITANCE GAGING ELEMENT; BRACKET MTG; OVER-ALL DIMENSIONS,12.82 IN. LG,12.88 IN. DIA; W/O SPARE PARTS IN
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 3
1660-00-078-822710C-0005-11 INTERCHANGEABLE
Converter,liquid Oxygen
Essex Industries, Inc. Dba Essex Industries
1660-00-775-548121073-3 INTERCHANGEABLE
Converter,liquid Oxygen
Mission Systems Orchard Park Inc
1660-00-902-054310C-0005-10 INTERCHANGEABLE
Converter,liquid Oxygen
Essex Industries, Inc. Dba Essex Industries
Cross-Reference Index
Part NumberManufacturer
M25666/1 Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
MIL-DTL-25666/1 Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
8148650 Air Force United States Department of the Dba Tinker Afb Oc Alc Dsp Div Department of the Air Force (USA)
GCU2A/A Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
MILC25777 Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
Related Parts
1660-00-078-8227INTERCHANGEABLE
CONVERTER,LIQUID OXYGEN
10C-0005-11
1660-00-775-5481INTERCHANGEABLE
CONVERTER,LIQUID OXYGEN
21073-3
1660-00-902-0543INTERCHANGEABLE
CONVERTER,LIQUID OXYGEN
10C-0005-10

Frequently Asked Questions

What is NSN 1660-00-540-5306?

NSN 1660-00-540-5306 is a Converter,liquid Oxygen, manufactured by Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M, classified under FSC 1660 (No Item Name Available). Status: active.

What are the part numbers for NSN 1660-00-540-5306?

NSN 1660-00-540-5306 has 5 cross-referenced part numbers: M25666/1 (Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M), MIL-DTL-25666/1 (Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M), 8148650 (Air Force United States Department of the Dba Tinker Afb Oc Alc Dsp Div Department of the Air Force), GCU2A/A (Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M), MILC25777 (Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M).

What NSN replaces 1660-00-540-5306?

There are 3 known substitutes for 1660-00-540-5306: 1660-00-078-8227, 1660-00-775-5481, 1660-00-902-0543. Verify interchangeability with system specifications before substitution.

What are the specifications of M25666/1?

Key specifications for M25666/1: FSC Application Data: OXYGEN BREATHING SYSTEM,ACFT; General Characteristics Item Description: 70 PSI,OPERATING PRESSURE; AMBIENT AIR HEATED METHOD OF OXYGEN WARMING; 10 L PER MIN,OUTPUT CAPACITY; W/PRESSURE OPENING-PRESSURE CLOSING VALVE; 1 RELIEF VALVE; W/CHECK VALVE; W/PRESSURE GAGE; W/CAPACITANCE GAGING ELEMENT; BRACKET MTG; OVER-ALL DIMENSIONS,12.82 IN. LG,12.88 IN. DIA; W/O SPARE PARTS IN. 2 total characteristics are documented in the Federal Logistics Information System.

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