PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

M3661/25-LC25CN2Lens,light

Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M · NSN 6210-01-434-4578 · FSC 6210 · No Item Name Available
Verified by PartsTable
NSN 6210-01-434-4578 — this item is cataloged by the U.S. Government under National Stock Number 6210-01-434-4578. Primary manufacturer part number: M3661/25-LC25CN2.
Features
  • Lens,light — FSC 6210
  • Light Transmission Design: TRANSPARENT LENS
  • Style Designator: FLAT
  • Test Data Document: 81349-MIL-L-3661 SPECIFICATION (INCLUDES ENGINEERING TYPE BULLETINS, BROCHURES,ETC., THAT REFLECT SPECIFICATION TYPE DATA IN SPECIFICATION FORMAT; EXCLUDES COMMERCIAL CATALOGS, INDUSTRY DIRECTORIES, AND SIMILAR TRADE PUBLICATIONS, REFLECTING GENERAL TYPE DATA ON CERTAIN ENVIRONMENTAL AND PERFORMANCE REQUIREMENTS AND TEST CONDITIONS THAT ARE SHOWN AS "TYPICAL", "AVERAGE", "NOMINAL", ETC.).
  • Effective Diameter: 11.9 MILLIMETERS NOMINAL MM
  • Material: PLASTIC BASE
  • Thread Class: 2A A
  • Thread Quantity: 32 PER INCH
Applications
  • Area illumination
  • Indicator and warning display
  • Navigation and signal lighting
  • Applications requiring Plastic Base construction
General Description

The Lens,light, cataloged under National Stock Number 6210-01-434-4578, is classified within Federal Supply Class 6210 (No Item Name Available) of the Lighting Fixtures and Lamps 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 10 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 3 commercial cross-references from 1 manufacturer, enabling identification through both NSN and commercial part number lookups. 9 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN6210-01-434-4578
Primary Part NumberM3661/25-LC25CN2
Item NameLens,light
FSC / FSG6210 / 62 — No Item Name Available
ManufacturerMilitary Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
StatusACTIVE
Light Transmission DesignTRANSPARENT LENS
Style DesignatorFLAT
Test Data Document81349-MIL-L-3661 SPECIFICATION (INCLUDES ENGINEERING TYPE BULLETINS, BROCHURES,ETC., THAT REFLECT SPECIFICATION TYPE DATA IN SPECIFICATION FORMAT; EXCLUDES COMMERCIAL CATALOGS, INDUSTRY DIRECTORIES, AND SIMILAR TRADE PUBLICATIONS, REFLECTING GENERAL TYPE DATA ON CERTAIN ENVIRONMENTAL AND PERFORMANCE REQUIREMENTS AND TEST CONDITIONS THAT ARE SHOWN AS "TYPICAL", "AVERAGE", "NOMINAL", ETC.).
Effective Diameter11.9 MILLIMETERS NOMINAL MM
MaterialPLASTIC BASE
Thread Class2A A
Thread Quantity32 PER INCH
Thread SeriesUNEF
Mounting MethodTHREAD
Thread Length0.938 INCHES NOMINAL IN
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 9
6210-00-001-1438 INTERCHANGEABLE
Lens,light
6210-00-150-2002 INTERCHANGEABLE
Lens,light
6210-00-625-3901 INTERCHANGEABLE
Lens,light
6210-00-625-3904 INTERCHANGEABLE
Lens,light
6210-01-014-3439 INTERCHANGEABLE
Lens,light
6210-01-030-2332 INTERCHANGEABLE
Lens,light
6210-01-133-9588 INTERCHANGEABLE
Lens,light
6210-01-413-8776 INTERCHANGEABLE
Lens,light
6210-01-413-8777 INTERCHANGEABLE
Lens,light
Cross-Reference Index
Part NumberManufacturer
M3661/25-LC25CN2 Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
MIL-DTL-3661/25 Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
MIL-L-3661/25 Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
Related Parts
6210-00-001-1438INTERCHANGEABLE
LENS,LIGHT
6210-00-150-2002INTERCHANGEABLE
LENS,LIGHT
6210-00-625-3901INTERCHANGEABLE
LENS,LIGHT
6210-00-625-3904INTERCHANGEABLE
LENS,LIGHT
6210-01-014-3439INTERCHANGEABLE
LENS,LIGHT
6210-01-030-2332INTERCHANGEABLE
LENS,LIGHT
6210-01-133-9588INTERCHANGEABLE
LENS,LIGHT
6210-01-413-8776INTERCHANGEABLE
LENS,LIGHT
6210-01-413-8777INTERCHANGEABLE
LENS,LIGHT

Frequently Asked Questions

What is NSN 6210-01-434-4578?

NSN 6210-01-434-4578 is a Lens,light, manufactured by Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M, classified under FSC 6210 (No Item Name Available). Status: active.

What are the part numbers for NSN 6210-01-434-4578?

NSN 6210-01-434-4578 has 3 cross-referenced part numbers: M3661/25-LC25CN2 (Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M), MIL-DTL-3661/25 (Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M), MIL-L-3661/25 (Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M).

What NSN replaces 6210-01-434-4578?

There are 9 known substitutes for 6210-01-434-4578: 6210-00-001-1438, 6210-00-150-2002, 6210-00-625-3901 and 6 more. Verify interchangeability with system specifications before substitution.

What are the specifications of M3661/25-LC25CN2?

Key specifications for M3661/25-LC25CN2: Light Transmission Design: TRANSPARENT LENS; Style Designator: FLAT; Test Data Document: 81349-MIL-L-3661 SPECIFICATION (INCLUDES ENGINEERING TYPE BULLETINS, BROCHURES,ETC., THAT REFLECT SPECIFICATION TYPE DATA IN SPECIFICATION FORMAT; EXCLUDES COMMERCIAL CATALOGS, INDUSTRY DIRECTORIES, AND SIMILAR TRADE PUBLICATIONS, REFLECTING GENERAL TYPE DATA ON CERTAIN ENVIRONMENTAL AND PERFORMANCE REQUIREMENTS AND TEST CONDITIONS THAT ARE SHOWN AS "TYPICAL", "AVERAGE", "NOMINAL", ETC.).; Overall Length: 18.2 MILLIMETERS NOMINAL MM. 11 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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