PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

NAS4120-02BHeat Sink,electrical-Electronic

National Aerospace Standards Committee Aerospace Industries Association of America Inc Not for Rfq or Solicitation Use · NSN 5999-01-520-5159 · FSC 5999 · No Item Name Available
Verified by PartsTable
NSN 5999-01-520-5159 — this item is cataloged by the U.S. Government under National Stock Number 5999-01-520-5159. Primary manufacturer part number: NAS4120-02B.
Features
  • Heat Sink,electrical-Electronic — FSC 5999
  • Material: ALUMINUM ALLOY 2024
  • Mounting Facility Type and Quantity: 1 FLANGE SINGLE MOUNTING FACILITY
  • Accommodated Device Mounting Hole Quantity: 1
  • Surface Treatment: ANODIZE
  • Overall Diameter: 0.750 INCHES NOMINAL IN
  • Body Style: CYLINDRICAL
  • Material: ALUMINUM ALLOY 2024
Applications
  • Applications requiring Aluminum Alloy 2024 construction
General Description

The Heat Sink,electrical-Electronic, cataloged under National Stock Number 5999-01-520-5159, 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 12 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 4 commercial cross-references from 2 manufacturers, enabling identification through both NSN and commercial part number lookups. 11 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active. Unit of issue: EA.

Technical Specifications
ParameterValue
NSN5999-01-520-5159
Primary Part NumberNAS4120-02B
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
MaterialALUMINUM ALLOY 2024
Mounting Facility Type and Quantity1 FLANGE SINGLE MOUNTING FACILITY
Accommodated Device Mounting Hole Quantity1
Surface TreatmentANODIZE
Overall Diameter0.750 INCHES NOMINAL IN
Body StyleCYLINDRICAL
MaterialALUMINUM ALLOY 2024
Mounting Facility Type and Quantity1 FLANGE SINGLE MOUNTING FACILITY
Accommodated Device Mounting Hole Quantity1
Surface TreatmentANODIZE
Overall Diameter0.750 INCHES NOMINAL IN
Body StyleCYLINDRICAL
Lifecycle & Compliance
Acquisition StatusACTIVE
Successor5999-01-134-1783
HAZMATNo
Shelf Life Code9
Criticality CodeQ
Unit of IssueEA
SMR CodeJZ
Verified Substitutes 11
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
5999-01-192-3273NAS4120-02L INTERCHANGEABLE
Heat Sink,electrical-Electronic
National Aerospace Standards Committee Aerospace Industries Association of America Inc Not for Rfq or Solicitation Use
Cross-Reference Index
Part NumberManufacturer
NAS4120-02B PRIMARY National Aerospace Standards Committee Aerospace Industries Association of America Inc Not for Rfq or Solicitation Use (USA)
NAS4120 National Aerospace Standards Committee Aerospace Industries Association of America Inc Not for Rfq or Solicitation Use (USA)
MIL-H-87111/4 Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
NAS4120-02B Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
Related Parts
SUCCESSOR 5999-01-134-1783 Heat Sink,electrical-Electronic
5999-01-208-7300SUCCESSOR
HEAT SINK,ELECTRICAL-ELECTRONIC
5999-01-208-7301SUCCESSOR
HEAT SINK,ELECTRICAL-ELECTRONIC
5999-01-208-7302SUCCESSOR
HEAT SINK,ELECTRICAL-ELECTRONIC
5999-01-233-0839SUCCESSOR
HEAT SINK,ELECTRICAL-ELECTRONIC
5999-01-261-5428SUCCESSOR
HEAT SINK,ELECTRICAL-ELECTRONIC
5999-01-310-6948SUCCESSOR
HEAT SINK,ELECTRICAL-ELECTRONIC
5999-01-330-2659SUCCESSOR
HEAT SINK,ELECTRICAL-ELECTRONIC
5999-01-399-3230SUCCESSOR
HEAT SINK,ELECTRICAL-ELECTRONIC
5999-01-192-3273INTERCHANGEABLE
HEAT SINK,ELECTRICAL-ELECTRONIC
NAS4120-02L
5999-01-205-3101INTERCHANGEABLE
HEAT SINK,ELECTRICAL-ELECTRONIC
NAS4120-04B

Frequently Asked Questions

What is NSN 5999-01-520-5159?

NSN 5999-01-520-5159 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 5999-01-520-5159?

NSN 5999-01-520-5159 has 4 cross-referenced part numbers: NAS4120-02B (National Aerospace Standards Committee Aerospace Industries Association of America Inc Not for Rfq or Solicitation Use), NAS4120 (National Aerospace Standards Committee Aerospace Industries Association of America Inc Not for Rfq or Solicitation Use), MIL-H-87111/4 (Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M), NAS4120-02B (Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M).

What NSN replaces 5999-01-520-5159?

There are 11 known substitutes for 5999-01-520-5159: 5999-01-134-1783, 5999-01-208-7300, 5999-01-208-7301 and 8 more. Verify interchangeability with system specifications before substitution.

What are the specifications of NAS4120-02B?

Key specifications for NAS4120-02B: Part Name Assigned by Controlling Agency: HEAT SINK; Material: ALUMINUM ALLOY 2024; Mounting Facility Type and Quantity: 1 FLANGE SINGLE MOUNTING FACILITY; Accommodated Device Mounting Hole Quantity: 1. 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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