PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

21984Heater,coolant,engine

Willard Marine, Inc. · NSN 2990-01-562-8583 · FSC 2990 · No Item Name Available
Verified by PartsTable
NSN 2990-01-562-8583 — this item is cataloged by the U.S. Government under National Stock Number 2990-01-562-8583. Primary manufacturer part number: 21984.
Features
  • Heater,coolant,engine — FSC 2990
  • 1 verified cross-reference
  • Primary manufacturer: Willard Marine, Inc.
Applications
  • Mechanical power generation
  • Drive system operation
  • Auxiliary equipment operation
General Description

The Heater,coolant,engine, cataloged under National Stock Number 2990-01-562-8583, is classified within Federal Supply Class 2990 (No Item Name Available) of the Engine Accessories group. The primary manufacturer of record is Willard Marine, Inc.. This item has 1 commercial cross-reference from 1 manufacturer, enabling identification through both NSN and commercial part number lookups. 8 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN2990-01-562-8583
Primary Part Number21984
Item NameHeater,coolant,engine
FSC / FSG2990 / 29 — No Item Name Available
ManufacturerWillard Marine, Inc.
StatusACTIVE
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 8
5999-00-134-5800219-84 INTERCHANGEABLE
Clip,electrical
Thales Components Corp Div Thales Components Corporation
5999-00-819-71089156810 INTERCHANGEABLE
Clip,electrical
Us Army Aviation and Missile Command
5935-00-973-1153 INTERCHANGEABLE
Connector,receptacle,electrical
4710-01-017-9279TT8-4-51 INTERCHANGEABLE
Tube,jacket,burner
Todd Combustion Inc
6145-01-138-27181898/4C INTERCHANGEABLE
Cable,power,electrical
Belden, Inc.
3510-01-162-4461 INTERCHANGEABLE
Cover,bleach Dispenser
3110-01-607-699121984 INTERCHANGEABLE
Needle,bearing
Emerson Power Transmission Corporation Div Ept
5340-01-691-110821984 INTERCHANGEABLE
Plug,protective,dust and Moistur
Tulsa Winch, Inc.
Cross-Reference Index
Part NumberManufacturer
21984 PRIMARY Willard Marine, Inc. (USA)
Related Parts
5999-00-134-5800INTERCHANGEABLE
CLIP,ELECTRICAL
219-84
5999-00-819-7108INTERCHANGEABLE
CLIP,ELECTRICAL
9156810
5935-00-973-1153INTERCHANGEABLE
CONNECTOR,RECEPTACLE,ELECTRICAL
4710-01-017-9279INTERCHANGEABLE
TUBE,JACKET,BURNER
TT8-4-51
6145-01-138-2718INTERCHANGEABLE
CABLE,POWER,ELECTRICAL
1898/4C
3510-01-162-4461INTERCHANGEABLE
COVER,BLEACH DISPENSER
3110-01-607-6991INTERCHANGEABLE
NEEDLE,BEARING
21984
5340-01-691-1108INTERCHANGEABLE
PLUG,PROTECTIVE,DUST AND MOISTUR
21984

Frequently Asked Questions

What is NSN 2990-01-562-8583?

NSN 2990-01-562-8583 is a Heater,coolant,engine, manufactured by Willard Marine, Inc., classified under FSC 2990 (No Item Name Available). Status: active.

What are the part numbers for NSN 2990-01-562-8583?

NSN 2990-01-562-8583 has 1 cross-referenced part number: 21984 (Willard Marine, Inc.).

What NSN replaces 2990-01-562-8583?

There are 8 known substitutes for 2990-01-562-8583: 5999-00-134-5800, 5999-00-819-7108, 5935-00-973-1153 and 5 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 21984?

Key specifications for 21984: End Item Identification: NSC 417 FT., WMSL-750 FT. 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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