PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

128425-1Heat Sink-Insulator

Lockheed Martin Corp · NSN 5999-01-362-0104 · FSC 5999 · No Item Name Available
Verified by PartsTable
NSN 5999-01-362-0104 — this item is cataloged by the U.S. Government under National Stock Number 5999-01-362-0104. Primary manufacturer part number: 128425-1.
Features
  • Heat Sink-Insulator — FSC 5999
  • Reference Number Differentiating Characteristics: MATERIAL WILL BE IN ACCORDANCE WITH SHIPS PARTS CONTROL CENTER ACTIVITY HX QUALITY CONTROL,MANUFACTURING AND TESTING SPECIFICATIONS
  • Criticality Code Justification: ZZZY
  • Reference Number Differentiating Characteristics: MATERIAL WILL BE IN ACCORDANCE WITH SHIPS PARTS CONTROL CENTER ACTIVITY HX QUALITY CONTROL,MANUFACTURING AND TESTING SPECIFICATIONS
  • Criticality Code Justification: ZZZY
  • 2 verified cross-references
  • Primary manufacturer: Lockheed Martin Corp
Applications
  • Industrial maintenance and repair
  • Government and military logistics
  • Equipment overhaul and refurbishment
General Description

The Heat Sink-Insulator, cataloged under National Stock Number 5999-01-362-0104, 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 Lockheed Martin Corp. Government technical data includes 4 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 2 commercial cross-references from 1 manufacturer, enabling identification through both NSN and commercial part number lookups. 1 verified substitute exists in the FLIS interchangeability database. Current acquisition status: Active. Unit of issue: EA.

Technical Specifications
ParameterValue
NSN5999-01-362-0104
Primary Part Number128425-1
Item NameHeat Sink-Insulator
FSC / FSG5999 / 59 — No Item Name Available
ManufacturerLockheed Martin Corp
StatusACTIVE
Reference Number Differentiating CharacteristicsMATERIAL WILL BE IN ACCORDANCE WITH SHIPS PARTS CONTROL CENTER ACTIVITY HX QUALITY CONTROL,MANUFACTURING AND TESTING SPECIFICATIONS
Criticality Code JustificationZZZY
Reference Number Differentiating CharacteristicsMATERIAL WILL BE IN ACCORDANCE WITH SHIPS PARTS CONTROL CENTER ACTIVITY HX QUALITY CONTROL,MANUFACTURING AND TESTING SPECIFICATIONS
Criticality Code JustificationZZZY
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Shelf Life Code0
Criticality CodeBL
Unit of IssueEA
SMR CodeVM
Weight0.0100 lbs
Cube0.0001 cu ft
Verified Substitutes 1
6650-00-525-3446128425-1 INTERCHANGEABLE
Lens,optical Instrument
Sypris Electronics, Llc
Cross-Reference Index
Part NumberManufacturer
128425-1 Lockheed Martin Corp (USA)
127012PC35 Lockheed Martin Corp (USA)
Related Parts
6650-00-525-3446INTERCHANGEABLE
LENS,OPTICAL INSTRUMENT
128425-1

Frequently Asked Questions

What is NSN 5999-01-362-0104?

NSN 5999-01-362-0104 is a Heat Sink-Insulator, manufactured by Lockheed Martin Corp, classified under FSC 5999 (No Item Name Available). Status: active.

What are the part numbers for NSN 5999-01-362-0104?

NSN 5999-01-362-0104 has 2 cross-referenced part numbers: 128425-1 (Lockheed Martin Corp), 127012PC35 (Lockheed Martin Corp).

What NSN replaces 5999-01-362-0104?

There is 1 known substitute for 5999-01-362-0104: 6650-00-525-3446. Verify interchangeability with system specifications before substitution.

What are the specifications of 128425-1?

Key specifications for 128425-1: Reference Number Differentiating Characteristics: MATERIAL WILL BE IN ACCORDANCE WITH SHIPS PARTS CONTROL CENTER ACTIVITY HX QUALITY CONTROL,MANUFACTURING AND TESTING SPECIFICATIONS; Part Name Assigned by Controlling Agency: INSULATOR,THERMAL; Criticality Code Justification: ZZZY; Reference Number Differentiating Characteristics: MATERIAL WILL BE IN ACCORDANCE WITH SHIPS PARTS CONTROL CENTER ACTIVITY HX QUALITY CONTROL,MANUFACTURING AND TESTING SPECIFICATIONS. 6 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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