PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

MIL-H-87111/2Heat Sink,electrical-Electronic

Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M · NSN 5999-01-246-9666 · FSC 5999 · No Item Name Available
Verified by PartsTable
NSN 5999-01-246-9666 — this item is cataloged by the U.S. Government under National Stock Number 5999-01-246-9666. Primary manufacturer part number: MIL-H-87111/2.
Features
  • Heat Sink,electrical-Electronic — FSC 5999
  • Material Document and Classification: QQ-C-533 FED SPEC 1ST MATERIAL RESPONSE OR MIL-C-81021 MIL SPEC 1ST MATERIAL RESPONSE
  • Material: COPPER ALLOY 172 AND BERYLLIUM OXIDE
  • Surface Treatment: CHROMATE
  • Material: COPPER ALLOY 172 AND BERYLLIUM OXIDE
  • Surface Treatment: CHROMATE
  • Material Document and Classification: QQ-C-533 FED SPEC 1ST MATERIAL RESPONSE OR MIL-C-81021 MIL SPEC 1ST MATERIAL RESPONSE
  • 3 verified cross-references
Applications
  • Applications requiring Copper Alloy 172 and Beryllium Oxide construction
General Description

The Heat Sink,electrical-Electronic, cataloged under National Stock Number 5999-01-246-9666, 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 Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M. Government technical data includes 6 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 3 commercial cross-references from 1 manufacturer, 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
NSN5999-01-246-9666
Primary Part NumberMIL-H-87111/2
Item NameHeat Sink,electrical-Electronic
FSC / FSG5999 / 59 — No Item Name Available
ManufacturerMilitary Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
StatusCANCELLED
Material Document and ClassificationQQ-C-533 FED SPEC 1ST MATERIAL RESPONSE OR MIL-C-81021 MIL SPEC 1ST MATERIAL RESPONSE
MaterialCOPPER ALLOY 172 AND BERYLLIUM OXIDE
Surface TreatmentCHROMATE
MaterialCOPPER ALLOY 172 AND BERYLLIUM OXIDE
Surface TreatmentCHROMATE
Material Document and ClassificationQQ-C-533 FED SPEC 1ST MATERIAL RESPONSE OR MIL-C-81021 MIL SPEC 1ST MATERIAL RESPONSE
Lifecycle & Compliance
Acquisition StatusCANCELLED
HAZMATNo
Shelf Life Code0
Criticality CodeQ
Unit of IssueEA
SMR CodeJN
Verified Substitutes 10
No Item Name Available
5999-01-173-3176NAS4118E01K SUCCESSOR
Heat Sink,electrical-Electronic
National Aerospace Standards Committee Aerospace Industries Association of America Inc Not for Rfq or Solicitation Use
5999-01-174-3168NAS4118E05H SUCCESSOR
Heat Sink,electrical-Electronic
National Aerospace Standards Committee Aerospace Industries Association of America Inc Not for Rfq or Solicitation Use
5999-01-211-1617NAS4118F12D SUCCESSOR
Heat Sink,electrical-Electronic
National Aerospace Standards Committee Aerospace Industries Association of America Inc Not for Rfq or Solicitation Use
5999-01-216-8588NAS4118E16C SUCCESSOR
Heat Sink,electrical-Electronic
National Aerospace Standards Committee Aerospace Industries Association of America Inc Not for Rfq or Solicitation Use
5999-01-319-4133NAS4118-G24C SUCCESSOR
Heat Sink,electrical-Electronic
National Aerospace Standards Committee Aerospace Industries Association of America Inc Not for Rfq or Solicitation Use
5999-01-328-5037NAS4118E16H SUCCESSOR
Heat Sink,electrical-Electronic
National Aerospace Standards Committee Aerospace Industries Association of America Inc Not for Rfq or Solicitation Use
5999-01-372-4067NAS4118F08D SUCCESSOR
Heat Sink,electrical-Electronic
National Aerospace Standards Committee Aerospace Industries Association of America Inc Not for Rfq or Solicitation Use
5999-01-411-1080NAS4118G27C SUCCESSOR
Heat Sink,electrical-Electronic
National Aerospace Standards Committee Aerospace Industries Association of America Inc Not for Rfq or Solicitation Use
5999-01-498-4393NAS4118F15C SUCCESSOR
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
MIL-H-87111/2 Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
M87111/02-3B14 Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
M87111/02-3A14 Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
Related Parts
5999-01-211-1620SUCCESSOR
NO ITEM NAME AVAILABLE
5999-01-173-3176SUCCESSOR
HEAT SINK,ELECTRICAL-ELECTRONIC
NAS4118E01K
5999-01-174-3168SUCCESSOR
HEAT SINK,ELECTRICAL-ELECTRONIC
NAS4118E05H
5999-01-211-1617SUCCESSOR
HEAT SINK,ELECTRICAL-ELECTRONIC
NAS4118F12D
5999-01-216-8588SUCCESSOR
HEAT SINK,ELECTRICAL-ELECTRONIC
NAS4118E16C
5999-01-319-4133SUCCESSOR
HEAT SINK,ELECTRICAL-ELECTRONIC
NAS4118-G24C
5999-01-328-5037SUCCESSOR
HEAT SINK,ELECTRICAL-ELECTRONIC
NAS4118E16H
5999-01-372-4067SUCCESSOR
HEAT SINK,ELECTRICAL-ELECTRONIC
NAS4118F08D
5999-01-411-1080SUCCESSOR
HEAT SINK,ELECTRICAL-ELECTRONIC
NAS4118G27C
5999-01-498-4393SUCCESSOR
HEAT SINK,ELECTRICAL-ELECTRONIC
NAS4118F15C

Frequently Asked Questions

What is NSN 5999-01-246-9666?

NSN 5999-01-246-9666 is a Heat Sink,electrical-Electronic, manufactured by Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M, classified under FSC 5999 (No Item Name Available). Status: cancelled.

What are the part numbers for NSN 5999-01-246-9666?

NSN 5999-01-246-9666 has 3 cross-referenced part numbers: MIL-H-87111/2 (Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M), M87111/02-3B14 (Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M), M87111/02-3A14 (Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M).

What NSN replaces 5999-01-246-9666?

There are 10 known substitutes for 5999-01-246-9666: 5999-01-211-1620, 5999-01-173-3176, 5999-01-174-3168 and 7 more. Verify interchangeability with system specifications before substitution.

What are the specifications of MIL-H-87111/2?

Key specifications for MIL-H-87111/2: Special Features: CARE SHOULD BE TAKEN WHEN DISPOSING OF THE ITEM DUE TO THE COMPOSITION OF THE MATERIAL USED TO FABRICATED THE ITEM WHICH CAN BE DEADLY IN MINUTE AMOUNTS WHEN INHALED; Overall Width: 0.250 INCHES NOMINAL IN; Overall Length: 0.335 INCHES MINIMUM AND 0.350 INCHES MAXIMUM IN; Material Document and Classification: QQ-C-533 FED SPEC 1ST MATERIAL RESPONSE OR MIL-C-81021 MIL SPEC 1ST MATERIAL RESPONSE. 12 total characteristics are documented in the Federal Logistics Information System.

Is NSN 5999-01-246-9666 still in active supply?

NSN 5999-01-246-9666 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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