PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

7-3581Heat Transfer Fluid

Thermal Dynamics Corp · NSN 6850-01-437-7803 · FSC 6850 · No Item Name Available
Verified by PartsTable
NSN 6850-01-437-7803 — this item is cataloged by the U.S. Government under National Stock Number 6850-01-437-7803. Primary manufacturer part number: 7-3581.
Features
  • Heat Transfer Fluid — FSC 6850
  • 3 verified cross-references
  • Primary manufacturer: Thermal Dynamics Corp
Applications
  • Industrial maintenance and repair
  • Government and military logistics
  • Equipment overhaul and refurbishment
General Description

The Heat Transfer Fluid, cataloged under National Stock Number 6850-01-437-7803, is classified within Federal Supply Class 6850 (No Item Name Available) of the Chemicals and Chemical Products group. The primary manufacturer of record is Thermal Dynamics Corp. This item has 3 commercial cross-references from 2 manufacturers, enabling identification through both NSN and commercial part number lookups. 5 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN6850-01-437-7803
Primary Part Number7-3581
Item NameHeat Transfer Fluid
FSC / FSG6850 / 68 — No Item Name Available
ManufacturerThermal Dynamics Corp
StatusACTIVE
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 5
5340-00-119-2067205-83 INTERCHANGEABLE
Clip,spring Tension
Cmc of Georgia, Inc.
5342-00-235-232572959 INTERCHANGEABLE
Clip
Legend Electric Vehicles
5330-00-543-614572959 INTERCHANGEABLE
Gasket
L3harris Technologies, Inc Div Space & Airborne Systems
5365-00-597-703773581 INTERCHANGEABLE
Shim
Honeywell International Inc. Dba Honeywell International Div Aerospace - Phoenix
6685-00-821-9858318470-2 INTERCHANGEABLE
Dampener,fluid Pressure
Naval Air Warfare Center Aircraft Division Joint Base Jbmdl
Cross-Reference Index
Part NumberManufacturer
7-3581 Thermal Dynamics Corporation (USA)
7-2959 Thermal Dynamics Corp (USA)
7-3581 PRIMARY Thermal Dynamics Corp (USA)
Related Parts
5340-00-119-2067INTERCHANGEABLE
CLIP,SPRING TENSION
205-83
5342-00-235-2325INTERCHANGEABLE
CLIP
72959
5330-00-543-6145INTERCHANGEABLE
GASKET
72959
5365-00-597-7037INTERCHANGEABLE
SHIM
73581
6685-00-821-9858INTERCHANGEABLE
DAMPENER,FLUID PRESSURE
318470-2

Frequently Asked Questions

What is NSN 6850-01-437-7803?

NSN 6850-01-437-7803 is a Heat Transfer Fluid, manufactured by Thermal Dynamics Corp, classified under FSC 6850 (No Item Name Available). Status: active.

What are the part numbers for NSN 6850-01-437-7803?

NSN 6850-01-437-7803 has 3 cross-referenced part numbers: 7-3581 (Thermal Dynamics Corporation), 7-2959 (Thermal Dynamics Corp), 7-3581 (Thermal Dynamics Corp).

What NSN replaces 6850-01-437-7803?

There are 5 known substitutes for 6850-01-437-7803: 5340-00-119-2067, 5342-00-235-2325, 5330-00-543-6145 and 2 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 7-3581?

Key specifications for 7-3581: Special Features: PRODUCT IS A HEAT TRANSFER FLUID/COOLANT. 1 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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