PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

NAS4120-04BHeat Sink,electrical-Electronic

National Aerospace Standards Committee Aerospace Industries Association of America Inc Not for Rfq or Solicitation Use · NSN 5999-01-205-3101 · FSC 5999 · No Item Name Available
Verified by PartsTable
NSN 5999-01-205-3101 — this item is cataloged by the U.S. Government under National Stock Number 5999-01-205-3101. Primary manufacturer part number: NAS4120-04B.
Features
  • Heat Sink,electrical-Electronic — FSC 5999
  • Unthreaded Mounting Hole Diameter: 0.296 INCHES NOMINAL SINGLE MOUNTING FACILITY IN
  • Material: ALUMINUM ALLOY
  • Surface Treatment: ANODIZE
  • Mounting Facility Type and Quantity: 1 UNTHREADED HOLE(S) SINGLE MOUNTING FACILITY
  • Unthreaded Mounting Hole Diameter: 0.296 INCHES NOMINAL SINGLE MOUNTING FACILITY IN
  • Material: ALUMINUM ALLOY
  • Surface Treatment: ANODIZE
Applications
  • Applications requiring Aluminum Alloy construction
General Description

The Heat Sink,electrical-Electronic, cataloged under National Stock Number 5999-01-205-3101, 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 8 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 7 commercial cross-references from 5 manufacturers, enabling identification through both NSN and commercial part number lookups. 11 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Cancelled. Unit of issue: EA.

Technical Specifications
ParameterValue
NSN5999-01-205-3101
Primary Part NumberNAS4120-04B
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
StatusCANCELLED
Unthreaded Mounting Hole Diameter0.296 INCHES NOMINAL SINGLE MOUNTING FACILITY IN
MaterialALUMINUM ALLOY
Surface TreatmentANODIZE
Mounting Facility Type and Quantity1 UNTHREADED HOLE(S) SINGLE MOUNTING FACILITY
Unthreaded Mounting Hole Diameter0.296 INCHES NOMINAL SINGLE MOUNTING FACILITY IN
MaterialALUMINUM ALLOY
Surface TreatmentANODIZE
Mounting Facility Type and Quantity1 UNTHREADED HOLE(S) SINGLE MOUNTING FACILITY
Lifecycle & Compliance
Acquisition StatusCANCELLED
Successor5999-01-134-1783
HAZMATNo
Shelf Life Code0
Criticality CodeQ
Unit of IssueEA
SMR CodeDZ
Weight0.0200 lbs
Cube0.0096 cu ft
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
NAS4120-04B PRIMARY National Aerospace Standards Committee Aerospace Industries Association of America Inc Not for Rfq or Solicitation Use (USA)
293-006-9001 Honeywell International, Inc Div Aerospace-Tucson (USA)
M87111/04-1A04 Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
NAS4120-04A Aerospace Industries Association of America Inc
MIL-H-87111/4 Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
1101C Thermalloy Co Inc (USA)
NAS4120 National Aerospace Standards Committee Aerospace Industries Association of America Inc Not for Rfq or Solicitation Use (USA)
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
5999-01-520-5159INTERCHANGEABLE
HEAT SINK,ELECTRICAL-ELECTRONIC
NAS4120-02B

Frequently Asked Questions

What is NSN 5999-01-205-3101?

NSN 5999-01-205-3101 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: cancelled.

What are the part numbers for NSN 5999-01-205-3101?

NSN 5999-01-205-3101 has 7 cross-referenced part numbers: NAS4120-04B (National Aerospace Standards Committee Aerospace Industries Association of America Inc Not for Rfq or Solicitation Use), 293-006-9001 (Honeywell International, Inc Div Aerospace-Tucson), M87111/04-1A04 (Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M), NAS4120-04A (Aerospace Industries Association of America Inc), MIL-H-87111/4 (Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M) and 2 more.

What NSN replaces 5999-01-205-3101?

There are 11 known substitutes for 5999-01-205-3101: 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 NAS4120-04B?

Key specifications for NAS4120-04B: Overall Width: 0.500 INCHES NOMINAL IN; Overall Length: 0.765 INCHES NOMINAL IN; Overall Height: 0.250 INCHES NOMINAL IN; Unthreaded Mounting Hole Diameter: 0.296 INCHES NOMINAL SINGLE MOUNTING FACILITY IN. 14 total characteristics are documented in the Federal Logistics Information System.

Is NSN 5999-01-205-3101 still in active supply?

NSN 5999-01-205-3101 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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