PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

MIL-L-3661/21Lens,light

Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M · NSN 6210-00-067-8374 · FSC 6210 · No Item Name Available
Verified by PartsTable
NSN 6210-00-067-8374 — this item is cataloged by the U.S. Government under National Stock Number 6210-00-067-8374. Primary manufacturer part number: MIL-L-3661/21.
Features
  • Lens,light — FSC 6210
  • Color: YELLOW, AVIATION LENS
  • Material: PLASTIC LENS
  • Effective Diameter: 0.940 INCHES MINIMUM AND 1.000 INCHES MAXIMUM IN
  • Mounting Device Quantity: 1
  • Overall Diameter: 1.090 INCHES MINIMUM AND 1.150 INCHES MAXIMUM IN
  • Thread Direction: RIGHT-HAND
  • Thread Class: 2B
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 6210-00-067-8374, 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 17 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 8 commercial cross-references from 4 manufacturers, enabling identification through both NSN and commercial part number lookups. 11 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Cancelled.

Technical Specifications
ParameterValue
NSN6210-00-067-8374
Primary Part NumberMIL-L-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
ColorYELLOW, AVIATION LENS
MaterialPLASTIC LENS
Effective Diameter0.940 INCHES MINIMUM AND 1.000 INCHES MAXIMUM IN
Mounting Device Quantity1
Overall Diameter1.090 INCHES MINIMUM AND 1.150 INCHES MAXIMUM IN
Thread DirectionRIGHT-HAND
Thread Class2B
Surface ConditionSMOOTH FACE
Surface ConditionFROSTED BACK
Thread SeriesUNS
Light Transmission DesignTRANSLUCENT LENS
Mounting MethodINTERNAL THREAD
Thread Quantity27 PER INCH
Hazardous Locations/environmental ProtectionDRIPPROOF
Style DesignatorCONVEX
Thread Diameter1.000 INCHES IN
ColorBLACK HOLDER
Lifecycle & Compliance
Acquisition StatusCANCELLED
HAZMATNo
Verified Substitutes 11
6210-00-061-2623 INTERCHANGEABLE
Lens,light
6210-00-067-8354 INTERCHANGEABLE
Lens,light
6210-00-067-8357 INTERCHANGEABLE
Lens,light
6210-00-067-8834 INTERCHANGEABLE
Lens,light
6210-00-244-2897 INTERCHANGEABLE
Lens,light
5330-00-291-898511A8573 INTERCHANGEABLE
Gasket
Napco International Llc Dba Napco International Inc
6210-00-836-2565 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-L-3661/21 Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
51-0113-203 Zf Industrieantriebe Witten Gmbh (DEU)
MIL-DTL-3661/21 Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
LC21YD3 Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
145839 Komatsu American Intl Co (USA)
51-2213-203 Dialight Corporation (USA)
LC21YD1 Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
61-0213-300 Dialight Corporation (USA)
Related Parts
6210-00-061-2623INTERCHANGEABLE
LENS,LIGHT
6210-00-067-8354INTERCHANGEABLE
LENS,LIGHT
6210-00-067-8357INTERCHANGEABLE
LENS,LIGHT
6210-00-067-8834INTERCHANGEABLE
LENS,LIGHT
6210-00-244-2897INTERCHANGEABLE
LENS,LIGHT
5330-00-291-8985INTERCHANGEABLE
GASKET
11A8573
6210-00-836-2565INTERCHANGEABLE
LENS,LIGHT
6210-00-839-8865INTERCHANGEABLE
LENS,LIGHT
6210-00-892-5165INTERCHANGEABLE
LENS,LIGHT
6210-00-892-5166INTERCHANGEABLE
LENS,LIGHT
6210-01-104-0663INTERCHANGEABLE
LENS,LIGHT
51-0113-203

Frequently Asked Questions

What is NSN 6210-00-067-8374?

NSN 6210-00-067-8374 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 6210-00-067-8374?

NSN 6210-00-067-8374 has 8 cross-referenced part numbers: MIL-L-3661/21 (Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M), 51-0113-203 (Zf Industrieantriebe Witten Gmbh), MIL-DTL-3661/21 (Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M), LC21YD3 (Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M), 145839 (Komatsu American Intl Co) and 3 more.

What NSN replaces 6210-00-067-8374?

There are 11 known substitutes for 6210-00-067-8374: 6210-00-061-2623, 6210-00-067-8354, 6210-00-067-8357 and 8 more. Verify interchangeability with system specifications before substitution.

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

Key specifications for MIL-L-3661/21: Color: YELLOW, AVIATION LENS; Material: PLASTIC LENS; Effective Diameter: 0.940 INCHES MINIMUM AND 1.000 INCHES MAXIMUM IN; Mounting Device Quantity: 1. 18 total characteristics are documented in the Federal Logistics Information System.

Is NSN 6210-00-067-8374 still in active supply?

NSN 6210-00-067-8374 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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