PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

MIL-DTL-3661/21Lens,light

Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M · NSN 6210-00-836-2565 · FSC 6210 · No Item Name Available
Verified by PartsTable
NSN 6210-00-836-2565 — this item is cataloged by the U.S. Government under National Stock Number 6210-00-836-2565. Primary manufacturer part number: MIL-DTL-3661/21.
Features
  • Lens,light — FSC 6210
  • Effective Diameter: 0.940 INCHES MINIMUM AND 1.000 INCHES MAXIMUM IN
  • Light Transmission Design: TRANSLUCENT LENS
  • Thread Series: UNS
  • Mounting Method: INTERNAL THREAD
  • Style Designator: CONVEX
  • Surface Condition: SMOOTH FACE
  • Thread Diameter: 1.000 INCHES IN
Applications
  • Area illumination
  • Indicator and warning display
  • Navigation and signal lighting
  • Applications requiring Plastic Lens construction
General Description

The Lens,light, cataloged under National Stock Number 6210-00-836-2565, 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 18 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 4 commercial cross-references from 2 manufacturers, enabling identification through both NSN and commercial part number lookups. 9 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Cancelled.

Technical Specifications
ParameterValue
NSN6210-00-836-2565
Primary Part NumberMIL-DTL-3661/21
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
StatusCANCELLED
Effective Diameter0.940 INCHES MINIMUM AND 1.000 INCHES MAXIMUM IN
Light Transmission DesignTRANSLUCENT LENS
Thread SeriesUNS
Mounting MethodINTERNAL THREAD
Style DesignatorCONVEX
Surface ConditionSMOOTH FACE
Thread Diameter1.000 INCHES IN
MaterialPLASTIC LENS
ColorBLUE LENS
Thread Quantity27 PER INCH
Overall Diameter1.090 INCHES MINIMUM AND 1.150 INCHES MAXIMUM IN
Surface ConditionFROSTED BACK
Hazardous Locations/environmental ProtectionDRIPPROOF
Mounting Device Quantity1
Thread DirectionRIGHT-HAND
Thread Class2B
Thread Length0.200 INCHES MINIMUM AND 0.260 INCHES MAXIMUM IN
ColorBLACK HOLDER
Lifecycle & Compliance
Acquisition StatusCANCELLED
HAZMATNo
Verified Substitutes 9
6210-00-061-2623 INTERCHANGEABLE
Lens,light
6210-00-067-8354 INTERCHANGEABLE
Lens,light
6210-00-067-8357 INTERCHANGEABLE
Lens,light
6210-00-067-8374 INTERCHANGEABLE
Lens,light
6210-00-067-8834 INTERCHANGEABLE
Lens,light
6210-00-244-2897 INTERCHANGEABLE
Lens,light
6210-00-839-8865 INTERCHANGEABLE
Lens,light
6210-00-892-5165 INTERCHANGEABLE
Lens,light
6210-00-892-5166 INTERCHANGEABLE
Lens,light
Cross-Reference Index
Part NumberManufacturer
MIL-DTL-3661/21 Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
LC21BD3 Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
51-0114-203 Dialight Corporation (USA)
MIL-L-3661/21 Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
Related Parts
6210-00-061-2623INTERCHANGEABLE
LENS,LIGHT
6210-00-067-8354INTERCHANGEABLE
LENS,LIGHT
6210-00-067-8357INTERCHANGEABLE
LENS,LIGHT
6210-00-067-8374INTERCHANGEABLE
LENS,LIGHT
6210-00-067-8834INTERCHANGEABLE
LENS,LIGHT
6210-00-244-2897INTERCHANGEABLE
LENS,LIGHT
6210-00-839-8865INTERCHANGEABLE
LENS,LIGHT
6210-00-892-5165INTERCHANGEABLE
LENS,LIGHT
6210-00-892-5166INTERCHANGEABLE
LENS,LIGHT

Frequently Asked Questions

What is NSN 6210-00-836-2565?

NSN 6210-00-836-2565 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: cancelled.

What are the part numbers for NSN 6210-00-836-2565?

NSN 6210-00-836-2565 has 4 cross-referenced part numbers: MIL-DTL-3661/21 (Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M), LC21BD3 (Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M), 51-0114-203 (Dialight Corporation), MIL-L-3661/21 (Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M).

What NSN replaces 6210-00-836-2565?

There are 9 known substitutes for 6210-00-836-2565: 6210-00-061-2623, 6210-00-067-8354, 6210-00-067-8357 and 6 more. Verify interchangeability with system specifications before substitution.

What are the specifications of MIL-DTL-3661/21?

Key specifications for MIL-DTL-3661/21: Effective Diameter: 0.940 INCHES MINIMUM AND 1.000 INCHES MAXIMUM IN; Light Transmission Design: TRANSLUCENT LENS; Thread Series: UNS; Mounting Method: INTERNAL THREAD. 20 total characteristics are documented in the Federal Logistics Information System.

Is NSN 6210-00-836-2565 still in active supply?

NSN 6210-00-836-2565 is currently cancelled. Check with the Defense Logistics Agency for current availability and authorized substitutes.

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