PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

MIL-L-3661Light,indicator

Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M · NSN 6210-01-015-0104 · FSC 6210 · No Item Name Available
Verified by PartsTable
NSN 6210-01-015-0104 — this item is cataloged by the U.S. Government under National Stock Number 6210-01-015-0104. Primary manufacturer part number: MIL-L-3661.
Features
  • Light,indicator — FSC 6210
  • Lamp Bulb Size Designator: T-3 1/4
  • Lens Color: BLUE SINGLE LIGHT FIRST POSITION HORIZONTAL
  • Panel Accommodation Hole Diameter: 0.688 INCHES MINIMUM AND 0.694 INCHES MAXIMUM IN
  • Lens Type: CONVEX, KNURLED, THREADED SHANK SINGLE LIGHT FIRST POSITION HORIZONTAL
  • Transmitted Light Color: BLUE SINGLE LIGHT FIRST POSITION HORIZONTAL FULL DISPLAY DIVISION A
  • Mounting Method: PANEL LOCATION NOT OTHERWISE SPECIFIED
  • Mounting Method: SCREW IN LENS
Applications
  • Area illumination
  • Indicator and warning display
  • Navigation and signal lighting
General Description

The Light,indicator, cataloged under National Stock Number 6210-01-015-0104, 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 19 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 4 commercial cross-references from 1 manufacturer, 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
NSN6210-01-015-0104
Primary Part NumberMIL-L-3661
Item NameLight,indicator
FSC / FSG6210 / 62 — No Item Name Available
ManufacturerMilitary Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
StatusACTIVE
Lamp Bulb Size DesignatorT-3 1/4
Lens ColorBLUE SINGLE LIGHT FIRST POSITION HORIZONTAL
Panel Accommodation Hole Diameter0.688 INCHES MINIMUM AND 0.694 INCHES MAXIMUM IN
Lens TypeCONVEX, KNURLED, THREADED SHANK SINGLE LIGHT FIRST POSITION HORIZONTAL
Transmitted Light ColorBLUE SINGLE LIGHT FIRST POSITION HORIZONTAL FULL DISPLAY DIVISION A
Mounting MethodPANEL LOCATION NOT OTHERWISE SPECIFIED
Mounting MethodSCREW IN LENS
Furnished Items and Quantity2 GASKET AND 1 HEXAGON NUT AND 1 LOCK WASHER
Style DesignatorROUND FRAME, ROUND LENS TYPE
Lens Back Surface ConditionFROSTED SINGLE LIGHT FIRST POSITION HORIZONTAL
Panel Thickness for Which Designed0.188 INCHES MAXIMUM IN
Lens Face Surface ConditionSMOOTH SINGLE LIGHT FIRST POSITION HORIZONTAL
Lamp Type Accommodated and Quantity1 INCANDESCENT
Lens Light Transmission CharacteristicTRANSLUCENT SINGLE LIGHT FIRST POSITION HORIZONTAL
Terminal Type and Quantity2 SOLDER LUG
Lamp Base Type AccommodatedMINIATURE BAYONET
Lens Quantity1
Hazardous Locations/environmental ProtectionDRIPPROOF
Overall Diameter0.938 INCHES MINIMUM AND 0.968 INCHES MAXIMUM IN
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 12
6210-00-235-9161 INTERCHANGEABLE
Light,indicator
6210-00-553-0508 INTERCHANGEABLE
Light,indicator
6210-00-578-6452 INTERCHANGEABLE
Light,indicator
6210-00-843-0487 INTERCHANGEABLE
Light,indicator
6210-00-891-5030 INTERCHANGEABLE
Light,indicator
6210-00-891-5033 INTERCHANGEABLE
Light,indicator
6210-00-891-5034 INTERCHANGEABLE
Light,indicator
6210-00-892-2377 INTERCHANGEABLE
Light,indicator
6210-00-926-1279 INTERCHANGEABLE
Light,indicator
6210-01-007-1904 INTERCHANGEABLE
Light,indicator
Cross-Reference Index
Part NumberManufacturer
MIL-L-3661 Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
MIL-DTL-3661/8 AND MIL-L-3661/14 Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
LH76/3-LC14BD3 Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
MIL-DTL-3661/8 MIL-DTL-3661/14 Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
Related Parts
6210-00-235-9161INTERCHANGEABLE
LIGHT,INDICATOR
6210-00-553-0508INTERCHANGEABLE
LIGHT,INDICATOR
6210-00-578-6452INTERCHANGEABLE
LIGHT,INDICATOR
6210-00-843-0487INTERCHANGEABLE
LIGHT,INDICATOR
6210-00-891-5030INTERCHANGEABLE
LIGHT,INDICATOR
6210-00-891-5033INTERCHANGEABLE
LIGHT,INDICATOR
6210-00-891-5034INTERCHANGEABLE
LIGHT,INDICATOR
6210-00-892-2377INTERCHANGEABLE
LIGHT,INDICATOR
6210-00-926-1279INTERCHANGEABLE
LIGHT,INDICATOR
6210-01-007-1904INTERCHANGEABLE
LIGHT,INDICATOR
6210-01-010-8954INTERCHANGEABLE
LIGHT,INDICATOR
6210-01-050-7512INTERCHANGEABLE
LIGHT,INDICATOR

Frequently Asked Questions

What is NSN 6210-01-015-0104?

NSN 6210-01-015-0104 is a Light,indicator, 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 6210-01-015-0104?

NSN 6210-01-015-0104 has 4 cross-referenced part numbers: MIL-L-3661 (Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M), MIL-DTL-3661/8 AND MIL-L-3661/14 (Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M), LH76/3-LC14BD3 (Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M), MIL-DTL-3661/8 MIL-DTL-3661/14 (Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M).

What NSN replaces 6210-01-015-0104?

There are 12 known substitutes for 6210-01-015-0104: 6210-00-235-9161, 6210-00-553-0508, 6210-00-578-6452 and 9 more. Verify interchangeability with system specifications before substitution.

What are the specifications of MIL-L-3661?

Key specifications for MIL-L-3661: Lamp Bulb Size Designator: T-3 1/4; Lens Color: BLUE SINGLE LIGHT FIRST POSITION HORIZONTAL; Panel Accommodation Hole Diameter: 0.688 INCHES MINIMUM AND 0.694 INCHES MAXIMUM IN; Lens Type: CONVEX, KNURLED, THREADED SHANK SINGLE LIGHT FIRST POSITION HORIZONTAL. 20 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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