PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

C-21Detector,gas

Interlink Electronics, Inc · NSN 6665-01-723-6378 · FSC 6665 · No Item Name Available
Verified by PartsTable
NSN 6665-01-723-6378 — this item is cataloged by the U.S. Government under National Stock Number 6665-01-723-6378. Primary manufacturer part number: C-21.
Features
  • Detector,gas — FSC 6665
  • Function for Which Designed: INDICATION
  • Voltage Rating: 12.0 VOLTS NOMINAL
  • Quantity Within Each Immediate Container: 1
  • Features Provided: SELF TEST
  • 1 verified cross-reference
  • Primary manufacturer: Interlink Electronics, Inc
Applications
  • Industrial maintenance and repair
  • Government and military logistics
  • Equipment overhaul and refurbishment
General Description

The Detector,gas, cataloged under National Stock Number 6665-01-723-6378, is classified within Federal Supply Class 6665 (No Item Name Available) of the Instruments and Laboratory Equipment group. The primary manufacturer of record is Interlink Electronics, Inc. Government technical data includes 4 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 1 commercial cross-reference from 1 manufacturer, enabling identification through both NSN and commercial part number lookups. 6 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN6665-01-723-6378
Primary Part NumberC-21
Item NameDetector,gas
FSC / FSG6665 / 66 — No Item Name Available
ManufacturerInterlink Electronics, Inc
StatusACTIVE
Function for Which DesignedINDICATION
Voltage Rating12.0 VOLTS NOMINAL
Quantity Within Each Immediate Container1
Features ProvidedSELF TEST
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 6
5905-00-008-1620C21 INTERCHANGEABLE
Resistor,fixed,film
Welwyn Components Ltd
3110-00-339-3041C21 INTERCHANGEABLE
Bearing,ball,thrust
Butterworth, Inc.
5315-00-720-5915120614-001 INTERCHANGEABLE
Pin,tapered,plain
Bae Systems Information and Electronic Systems Integration Inc. Dba Bae Systems
4730-01-094-6827 INTERCHANGEABLE
Coupling,hose
4130-01-386-9427C21 INTERCHANGEABLE
Filter-Drier,refrigerant
R S P Industries Inc
5950-01-450-2748668-0292-010 INTERCHANGEABLE
Reactor
Rockwell Collins, Inc. Dba Collins Aerospace Government Systems Div Collins Aerospace - Government Systems
Cross-Reference Index
Part NumberManufacturer
C-21 PRIMARY Interlink Electronics, Inc (USA)
Related Parts
5905-00-008-1620INTERCHANGEABLE
RESISTOR,FIXED,FILM
C21
3110-00-339-3041INTERCHANGEABLE
BEARING,BALL,THRUST
C21
5315-00-720-5915INTERCHANGEABLE
PIN,TAPERED,PLAIN
120614-001
4730-01-094-6827INTERCHANGEABLE
COUPLING,HOSE
4130-01-386-9427INTERCHANGEABLE
FILTER-DRIER,REFRIGERANT
C21
5950-01-450-2748INTERCHANGEABLE
REACTOR
668-0292-010

Frequently Asked Questions

What is NSN 6665-01-723-6378?

NSN 6665-01-723-6378 is a Detector,gas, manufactured by Interlink Electronics, Inc, classified under FSC 6665 (No Item Name Available). Status: active.

What are the part numbers for NSN 6665-01-723-6378?

NSN 6665-01-723-6378 has 1 cross-referenced part number: C-21 (Interlink Electronics, Inc).

What NSN replaces 6665-01-723-6378?

There are 6 known substitutes for 6665-01-723-6378: 5905-00-008-1620, 3110-00-339-3041, 5315-00-720-5915 and 3 more. Verify interchangeability with system specifications before substitution.

What are the specifications of C-21?

Key specifications for C-21: Function for Which Designed: INDICATION; Overall Length: 85.0 MILLIMETERS NOMINAL MM; Voltage Rating: 12.0 VOLTS NOMINAL; Overall Height: 60.0 MILLIMETERS NOMINAL MM. 9 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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