PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

MIL-L-3661/17Lens,light

Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M · NSN 6210-00-067-8378 · FSC 6210 · No Item Name Available
Verified by PartsTable
NSN 6210-00-067-8378 — this item is cataloged by the U.S. Government under National Stock Number 6210-00-067-8378. Primary manufacturer part number: MIL-L-3661/17.
Features
  • Lens,light — FSC 6210
  • Inscription: DIM ARROW SYMBOL CW AND BRIGHT ARROW SYMBOL CCW HOLDER
  • Thread Direction: RIGHT-HAND
  • Light Transmission Design: TRANSLUCENT LENS
  • Furnished Items: GASKET
  • Thread Series: UNS
  • Thread Class: 2A A
  • Effective Diameter: 0.470 INCHES MINIMUM AND 0.530 INCHES MAXIMUM 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 6210-00-067-8378, 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 23 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. 12 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN6210-00-067-8378
Primary Part NumberMIL-L-3661/17
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
InscriptionDIM ARROW SYMBOL CW AND BRIGHT ARROW SYMBOL CCW HOLDER
Thread DirectionRIGHT-HAND
Light Transmission DesignTRANSLUCENT LENS
Furnished ItemsGASKET
Thread SeriesUNS
Thread Class2A A
Effective Diameter0.470 INCHES MINIMUM AND 0.530 INCHES MAXIMUM IN
Blackout DegreeCOMPLETE
ColorBLACK INSCRIPTION BACKGROUND
MaterialPLASTIC LENS
ColorBLACK HOLDER
ColorBLUE LENS
Surface ConditionSMOOTH FACE
Overall Diameter0.780 INCHES MINIMUM AND 0.840 INCHES MAXIMUM IN
Style DesignatorCONVEX
Mounting MethodEXTERNAL THREAD
Dimming Device TypeMECHANICAL SHUTTER
ColorBLACK INSCRIPTION
Hazardous Locations/environmental ProtectionDRIPPROOF
Thread Quantity27 PER INCH
Thread Diameter0.562 INCHES IN
Surface ConditionFROSTED BACK
Mounting Device Quantity1
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 12
6210-00-022-5992 INTERCHANGEABLE
Light,indicator
6210-00-067-8373 INTERCHANGEABLE
Lens,light
6210-00-067-8375 INTERCHANGEABLE
Lens,light
6210-00-519-1978 INTERCHANGEABLE
Light,indicator
6210-00-617-1491 INTERCHANGEABLE
Light,indicator
6210-00-811-8377 INTERCHANGEABLE
Lens,light
6210-00-842-6939 INTERCHANGEABLE
Lens,light
6210-00-843-5379 INTERCHANGEABLE
Lens,light
6210-00-845-5494 INTERCHANGEABLE
Light,indicator
6210-00-845-5496 INTERCHANGEABLE
Light,indicator
Cross-Reference Index
Part NumberManufacturer
MIL-L-3661/17 Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
LC17BD3 Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
MS90288-7 Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
MIL-DTL-3661/17 Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
203-0114-203 Dialight Corporation (USA)
Related Parts
6210-00-022-5992INTERCHANGEABLE
LIGHT,INDICATOR
6210-00-067-8373INTERCHANGEABLE
LENS,LIGHT
6210-00-067-8375INTERCHANGEABLE
LENS,LIGHT
6210-00-519-1978INTERCHANGEABLE
LIGHT,INDICATOR
6210-00-617-1491INTERCHANGEABLE
LIGHT,INDICATOR
6210-00-811-8377INTERCHANGEABLE
LENS,LIGHT
6210-00-842-6939INTERCHANGEABLE
LENS,LIGHT
6210-00-843-5379INTERCHANGEABLE
LENS,LIGHT
6210-00-845-5494INTERCHANGEABLE
LIGHT,INDICATOR
6210-00-845-5496INTERCHANGEABLE
LIGHT,INDICATOR
6210-00-865-3450INTERCHANGEABLE
LENS,LIGHT
6210-00-894-2388INTERCHANGEABLE
LENS,LIGHT

Frequently Asked Questions

What is NSN 6210-00-067-8378?

NSN 6210-00-067-8378 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 6210-00-067-8378?

NSN 6210-00-067-8378 has 5 cross-referenced part numbers: MIL-L-3661/17 (Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M), LC17BD3 (Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M), MS90288-7 (Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M), MIL-DTL-3661/17 (Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M), 203-0114-203 (Dialight Corporation).

What NSN replaces 6210-00-067-8378?

There are 12 known substitutes for 6210-00-067-8378: 6210-00-022-5992, 6210-00-067-8373, 6210-00-067-8375 and 9 more. Verify interchangeability with system specifications before substitution.

What are the specifications of MIL-L-3661/17?

Key specifications for MIL-L-3661/17: Inscription: DIM ARROW SYMBOL CW AND BRIGHT ARROW SYMBOL CCW HOLDER; Overall Length: 1.000 INCHES MAXIMUM IN; Thread Direction: RIGHT-HAND; Light Transmission Design: TRANSLUCENT LENS. 24 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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