PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

K-4-21Heat Sink,electrical-Electronic

Henkel Corporation · NSN 5999-01-458-6643 · FSC 5999 · No Item Name Available
Verified by PartsTable
NSN 5999-01-458-6643 — this item is cataloged by the U.S. Government under National Stock Number 5999-01-458-6643. Primary manufacturer part number: K-4-21.
Features
  • Heat Sink,electrical-Electronic — FSC 5999
  • 2 verified cross-references
  • Primary manufacturer: Henkel Corporation
Applications
  • Industrial maintenance and repair
  • Government and military logistics
  • Equipment overhaul and refurbishment
General Description

The Heat Sink,electrical-Electronic, cataloged under National Stock Number 5999-01-458-6643, 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 Henkel Corporation. This item has 2 commercial cross-references from 2 manufacturers, enabling identification through both NSN and commercial part number lookups. 2 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active. Unit of issue: EA.

Technical Specifications
ParameterValue
NSN5999-01-458-6643
Primary Part NumberK-4-21
Item NameHeat Sink,electrical-Electronic
FSC / FSG5999 / 59 — No Item Name Available
ManufacturerHenkel Corporation
StatusACTIVE
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Shelf Life Code0
Criticality CodeN
Unit of IssueEA
SMR CodeJN
Weight0.0100 lbs
Cube0.0076 cu ft
Verified Substitutes 2
3460-00-337-6332SX-1530-S INTERCHANGEABLE
Wheel,abrasive
Goodson Manufacturing Co Dba Goodson Manufacturing Co
1285-01-196-7846K421 INTERCHANGEABLE
Positioner
Daniels Manufacturing Corporation
Cross-Reference Index
Part NumberManufacturer
K-4-21 Henkel Corporation (USA)
128-029-0005 Northrop Grumman Systems Corporation (USA)
Related Parts
3460-00-337-6332INTERCHANGEABLE
WHEEL,ABRASIVE
SX-1530-S
1285-01-196-7846INTERCHANGEABLE
POSITIONER
K421

Frequently Asked Questions

What is NSN 5999-01-458-6643?

NSN 5999-01-458-6643 is a Heat Sink,electrical-Electronic, manufactured by Henkel Corporation, classified under FSC 5999 (No Item Name Available). Status: active.

What are the part numbers for NSN 5999-01-458-6643?

NSN 5999-01-458-6643 has 2 cross-referenced part numbers: K-4-21 (Henkel Corporation), 128-029-0005 (Northrop Grumman Systems Corporation).

What NSN replaces 5999-01-458-6643?

There are 2 known substitutes for 5999-01-458-6643: 3460-00-337-6332, 1285-01-196-7846. Verify interchangeability with system specifications before substitution.

What are the specifications of K-4-21?

Key specifications for K-4-21: End Item Identification: JOINT STRS RD E/I FSCM 55285; End Item Identification: JOINT STRS RD E/I FSCM 55285. 2 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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