PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

LA1C66A4BHeat Sink,electrical-Electronic

Thermalloy Co Inc · NSN 5999-01-209-2813 · FSC 5999 · No Item Name Available
Verified by PartsTable
NSN 5999-01-209-2813 — this item is cataloged by the U.S. Government under National Stock Number 5999-01-209-2813. Primary manufacturer part number: LA1C66A4B.
Features
  • Heat Sink,electrical-Electronic — FSC 5999
  • Material: ALUMINUM ALLOY
  • Specification/standard Data: 81349-MIL-H-87111/5 GOVERNMENT SPECIFICATION
  • Surface Treatment: ANODIZE
  • Test Data Document: 81349-MIL-H-87111 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.).
  • Material: ALUMINUM ALLOY
  • Specification/standard Data: 81349-MIL-H-87111/5 GOVERNMENT SPECIFICATION
  • Surface Treatment: ANODIZE
Applications
  • Applications requiring Aluminum Alloy construction
General Description

The Heat Sink,electrical-Electronic, cataloged under National Stock Number 5999-01-209-2813, is classified within Federal Supply Class 5999 (No Item Name Available) of the Electrical and Electronic Equipment Components group. The primary manufacturer of record is Thermalloy Co Inc. Government technical data includes 8 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 5 commercial cross-references from 3 manufacturers, enabling identification through both NSN and commercial part number lookups. 10 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Cancelled. Unit of issue: EA.

Technical Specifications
ParameterValue
NSN5999-01-209-2813
Primary Part NumberLA1C66A4B
Item NameHeat Sink,electrical-Electronic
FSC / FSG5999 / 59 — No Item Name Available
ManufacturerThermalloy Co Inc
StatusCANCELLED
MaterialALUMINUM ALLOY
Specification/standard Data81349-MIL-H-87111/5 GOVERNMENT SPECIFICATION
Surface TreatmentANODIZE
Test Data Document81349-MIL-H-87111 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.).
MaterialALUMINUM ALLOY
Specification/standard Data81349-MIL-H-87111/5 GOVERNMENT SPECIFICATION
Surface TreatmentANODIZE
Test Data Document81349-MIL-H-87111 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.).
Lifecycle & Compliance
Acquisition StatusCANCELLED
HAZMATNo
Shelf Life Code0
Criticality CodeQ
Unit of IssueEA
SMR CodeY
Verified Substitutes 10
5999-01-183-9737NAS4121-016B SUCCESSOR
Heat Sink,electrical-Electronic
National Aerospace Standards Committee Aerospace Industries Association of America Inc Not for Rfq or Solicitation Use
5999-01-209-0650NAS4121-017B SUCCESSOR
Heat Sink,electrical-Electronic
National Aerospace Standards Committee Aerospace Industries Association of America Inc Not for Rfq or Solicitation Use
5999-01-286-7295NAS4121-291B SUCCESSOR
Heat Sink,electrical-Electronic
National Aerospace Standards Committee Aerospace Industries Association of America Inc Not for Rfq or Solicitation Use
5999-01-423-6866NAS4121-117B SUCCESSOR
Heat Sink,electrical-Electronic
National Aerospace Standards Committee Aerospace Industries Association of America Inc Not for Rfq or Solicitation Use
9540-00-145-8437 INTERCHANGEABLE
Angle,structural
9540-00-288-3731 INTERCHANGEABLE
Angle,structural
2910-00-732-13915639565 INTERCHANGEABLE
Pump,fuel
U S Army Tank Automotive Command Amsta-Im-Mm
5330-00-823-4881Z053060198 INTERCHANGEABLE
Packing,preformed
Prestolite Electric Inc
9540-01-191-0634 INTERCHANGEABLE
Angle,structural
4820-01-365-903560198 INTERCHANGEABLE
Valve,ball
Dover Corp Groen Div
Cross-Reference Index
Part NumberManufacturer
LA1C66A4B Thermalloy Co Inc (USA)
M87111/05-1A15 Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
MIL-H-87111/5 Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
223360-003 Bae Systems Information and Electronic Systems Integration Inc. Dba Bae Systems (USA)
60198 Thermalloy Co Inc (USA)
Related Parts
5999-01-183-9737SUCCESSOR
HEAT SINK,ELECTRICAL-ELECTRONIC
NAS4121-016B
5999-01-209-0650SUCCESSOR
HEAT SINK,ELECTRICAL-ELECTRONIC
NAS4121-017B
5999-01-286-7295SUCCESSOR
HEAT SINK,ELECTRICAL-ELECTRONIC
NAS4121-291B
5999-01-423-6866SUCCESSOR
HEAT SINK,ELECTRICAL-ELECTRONIC
NAS4121-117B
9540-00-145-8437INTERCHANGEABLE
ANGLE,STRUCTURAL
9540-00-288-3731INTERCHANGEABLE
ANGLE,STRUCTURAL
2910-00-732-1391INTERCHANGEABLE
PUMP,FUEL
5639565
5330-00-823-4881INTERCHANGEABLE
PACKING,PREFORMED
Z053060198
9540-01-191-0634INTERCHANGEABLE
ANGLE,STRUCTURAL
4820-01-365-9035INTERCHANGEABLE
VALVE,BALL
60198

Frequently Asked Questions

What is NSN 5999-01-209-2813?

NSN 5999-01-209-2813 is a Heat Sink,electrical-Electronic, manufactured by Thermalloy Co Inc, classified under FSC 5999 (No Item Name Available). Status: cancelled.

What are the part numbers for NSN 5999-01-209-2813?

NSN 5999-01-209-2813 has 5 cross-referenced part numbers: LA1C66A4B (Thermalloy Co Inc), M87111/05-1A15 (Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M), MIL-H-87111/5 (Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M), 223360-003 (Bae Systems Information and Electronic Systems Integration Inc. Dba Bae Systems), 60198 (Thermalloy Co Inc).

What NSN replaces 5999-01-209-2813?

There are 10 known substitutes for 5999-01-209-2813: 5999-01-183-9737, 5999-01-209-0650, 5999-01-286-7295 and 7 more. Verify interchangeability with system specifications before substitution.

What are the specifications of LA1C66A4B?

Key specifications for LA1C66A4B: Material: ALUMINUM ALLOY; Overall Height: 0.190 INCHES NOMINAL IN; Overall Length: 2.000 INCHES NOMINAL IN; Overall Width: 0.530 INCHES NOMINAL IN. 14 total characteristics are documented in the Federal Logistics Information System.

Is NSN 5999-01-209-2813 still in active supply?

NSN 5999-01-209-2813 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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