PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

NAS4121-291BHeat Sink,electrical-Electronic

National Aerospace Standards Committee Aerospace Industries Association of America Inc Not for Rfq or Solicitation Use · NSN 5999-01-286-7295 · FSC 5999 · No Item Name Available
Verified by PartsTable
NSN 5999-01-286-7295 — this item is cataloged by the U.S. Government under National Stock Number 5999-01-286-7295. Primary manufacturer part number: NAS4121-291B.
Features
  • Heat Sink,electrical-Electronic — FSC 5999
  • Material Document and Classification: QQ-A-250 FED SPEC SINGLE MATERIAL RESPONSE
  • Test Data Document: 81349-MIL-S-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.).
  • Unthreaded Mounting Hole Diameter: 0.190 INCHES NOMINAL ALL MOUNTING FACILITIES IN
  • Surface Treatment: ANODIZE
  • Surface Treatment Document and Classification: MIL-A-8625 MIL SPEC SINGLE TREATMENT RESPONSE
  • Specification/standard Data: 81349-MIL-A-87111/5 GOVERNMENT SPECIFICATION
  • Mounting Facility Type and Quantity: 2 UNTHREADED HOLE(S) ALL MOUNTING FACILITIES
Applications
  • Applications requiring Aluminum Alloy construction
General Description

The Heat Sink,electrical-Electronic, cataloged under National Stock Number 5999-01-286-7295, 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 National Aerospace Standards Committee Aerospace Industries Association of America Inc Not for Rfq or Solicitation Use. Government technical data includes 16 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. Unit of issue: EA.

Technical Specifications
ParameterValue
NSN5999-01-286-7295
Primary Part NumberNAS4121-291B
Item NameHeat Sink,electrical-Electronic
FSC / FSG5999 / 59 — No Item Name Available
ManufacturerNational Aerospace Standards Committee Aerospace Industries Association of America Inc Not for Rfq or Solicitation Use
StatusACTIVE
Material Document and ClassificationQQ-A-250 FED SPEC SINGLE MATERIAL RESPONSE
Test Data Document81349-MIL-S-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.).
Unthreaded Mounting Hole Diameter0.190 INCHES NOMINAL ALL MOUNTING FACILITIES IN
Surface TreatmentANODIZE
Surface Treatment Document and ClassificationMIL-A-8625 MIL SPEC SINGLE TREATMENT RESPONSE
Specification/standard Data81349-MIL-A-87111/5 GOVERNMENT SPECIFICATION
Mounting Facility Type and Quantity2 UNTHREADED HOLE(S) ALL MOUNTING FACILITIES
MaterialALUMINUM ALLOY
Material Document and ClassificationQQ-A-250 FED SPEC SINGLE MATERIAL RESPONSE
Test Data Document81349-MIL-S-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.).
Unthreaded Mounting Hole Diameter0.190 INCHES NOMINAL ALL MOUNTING FACILITIES IN
Surface TreatmentANODIZE
Surface Treatment Document and ClassificationMIL-A-8625 MIL SPEC SINGLE TREATMENT RESPONSE
Specification/standard Data81349-MIL-A-87111/5 GOVERNMENT SPECIFICATION
Mounting Facility Type and Quantity2 UNTHREADED HOLE(S) ALL MOUNTING FACILITIES
MaterialALUMINUM ALLOY
Lifecycle & Compliance
Acquisition StatusACTIVE
Successor5999-01-137-5400
HAZMATNo
Shelf Life Code0
Unit of IssueEA
SMR CodeJ
Weight0.5600 lbs
Cube0.0413 cu ft
Verified Substitutes 12
Heat Sink,electrical-Electronic
Heat Sink,electrical-Electronic
Heat Sink,electrical-Electronic
Heat Sink,electrical-Electronic
Heat Sink,electrical-Electronic
Heat Sink,electrical-Electronic
Heat Sink,electrical-Electronic
Heat Sink,electrical-Electronic
Heat Sink,electrical-Electronic
Heat Sink,electrical-Electronic
Cross-Reference Index
Part NumberManufacturer
M87111/05-1A291 Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
NAS4121-291B PRIMARY National Aerospace Standards Committee Aerospace Industries Association of America Inc Not for Rfq or Solicitation Use (USA)
MIL-H-87111/5 Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
NAS4121-1B291 National Aerospace Standards Committee Aerospace Industries Association of America Inc Not for Rfq or Solicitation Use (USA)
NAS4121 National Aerospace Standards Committee Aerospace Industries Association of America Inc Not for Rfq or Solicitation Use (USA)
Related Parts
SUCCESSOR 5999-01-137-5400 Heat Sink,electrical-Electronic
5999-01-205-3100SUCCESSOR
HEAT SINK,ELECTRICAL-ELECTRONIC
5999-01-209-0651SUCCESSOR
HEAT SINK,ELECTRICAL-ELECTRONIC
5999-01-209-0652SUCCESSOR
HEAT SINK,ELECTRICAL-ELECTRONIC
5999-01-209-0654SUCCESSOR
HEAT SINK,ELECTRICAL-ELECTRONIC
5999-01-209-0655SUCCESSOR
HEAT SINK,ELECTRICAL-ELECTRONIC
5999-01-209-0656SUCCESSOR
HEAT SINK,ELECTRICAL-ELECTRONIC
5999-01-209-0657SUCCESSOR
HEAT SINK,ELECTRICAL-ELECTRONIC
5999-01-209-2812SUCCESSOR
HEAT SINK,ELECTRICAL-ELECTRONIC
5999-01-209-2813SUCCESSOR
HEAT SINK,ELECTRICAL-ELECTRONIC
5999-01-209-4597SUCCESSOR
HEAT SINK,ELECTRICAL-ELECTRONIC
5999-01-210-2287SUCCESSOR
HEAT SINK,ELECTRICAL-ELECTRONIC

Frequently Asked Questions

What is NSN 5999-01-286-7295?

NSN 5999-01-286-7295 is a Heat Sink,electrical-Electronic, manufactured by National Aerospace Standards Committee Aerospace Industries Association of America Inc Not for Rfq or Solicitation Use, classified under FSC 5999 (No Item Name Available). Status: active.

What are the part numbers for NSN 5999-01-286-7295?

NSN 5999-01-286-7295 has 5 cross-referenced part numbers: M87111/05-1A291 (Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M), NAS4121-291B (National Aerospace Standards Committee Aerospace Industries Association of America Inc Not for Rfq or Solicitation Use), MIL-H-87111/5 (Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M), NAS4121-1B291 (National Aerospace Standards Committee Aerospace Industries Association of America Inc Not for Rfq or Solicitation Use), NAS4121 (National Aerospace Standards Committee Aerospace Industries Association of America Inc Not for Rfq or Solicitation Use).

What NSN replaces 5999-01-286-7295?

There are 12 known substitutes for 5999-01-286-7295: 5999-01-137-5400, 5999-01-205-3100, 5999-01-209-0651 and 9 more. Verify interchangeability with system specifications before substitution.

What are the specifications of NAS4121-291B?

Key specifications for NAS4121-291B: Overall Width: 1.810 INCHES NOMINAL IN; Overall Height: 0.750 INCHES NOMINAL IN; Material Document and Classification: QQ-A-250 FED SPEC SINGLE MATERIAL RESPONSE; Test Data Document: 81349-MIL-S-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.).. 22 total characteristics are documented in the Federal Logistics Information System.

Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com