PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

21800Core Assembly,fluid Cooler

Coffin Turbo Pump Inc · NSN 4420-01-275-6243 · FSC 4420 · No Item Name Available
Verified by PartsTable
NSN 4420-01-275-6243 — this item is cataloged by the U.S. Government under National Stock Number 4420-01-275-6243. Primary manufacturer part number: 21800.
Features
  • Core Assembly,fluid Cooler — FSC 4420
  • Material: STEEL CORROSION RESISTING OVERALL
  • Style Designator: PLAIN COILED TUBE
  • Heat Transfer Method: INDIRECT
  • 5 verified cross-references
  • Primary manufacturer: Coffin Turbo Pump Inc
Applications
  • Applications requiring Steel Corrosion Resisting Overall construction
General Description

The Core Assembly,fluid Cooler, cataloged under National Stock Number 4420-01-275-6243, is classified within Federal Supply Class 4420 (No Item Name Available) of the Furnace, Steam, Drying, Nuclear Reactors group. The primary manufacturer of record is Coffin Turbo Pump Inc. Government technical data includes 3 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 5 commercial cross-references from 2 manufacturers, enabling identification through both NSN and commercial part number lookups. 12 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN4420-01-275-6243
Primary Part Number21800
Item NameCore Assembly,fluid Cooler
FSC / FSG4420 / 44 — No Item Name Available
ManufacturerCoffin Turbo Pump Inc
StatusACTIVE
MaterialSTEEL CORROSION RESISTING OVERALL
Style DesignatorPLAIN COILED TUBE
Heat Transfer MethodINDIRECT
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 12
6645-00-163-07657463 INTERCHANGEABLE
Wheel Assembly
The Chelsea Clock Llc
5940-00-257-56532306-08-00 INTERCHANGEABLE
Terminal,lug
Illinois Tool Works Inc
4130-00-270-4465 INTERCHANGEABLE
Filter-Drier,refrigerant
5935-00-295-64037321299 INTERCHANGEABLE
Connector,receptacle,electrical
U S Army Tank Automotive Command Amsta-Im-Mm
5330-00-350-04727463-000 INTERCHANGEABLE
Gasket
Danfoss Power Solutions II, Llc
1680-00-373-286221800 INTERCHANGEABLE
Grip,cyclic Stick
Mason Electric Co. Dba Mason Controls
4320-00-375-89139972 INTERCHANGEABLE
Head and Liner
Coffin Turbo Pump Inc
4730-00-407-0571207ACBH-8 INTERCHANGEABLE
Coupling,pipe
Parker-Hannifin Corp Div Fluid System Connector Division
5821-00-510-3156 INTERCHANGEABLE
Base Assy
5905-00-513-069702000-3556 INTERCHANGEABLE
Resistor,variable,wire Wound,non
Asrc Federal Facilities Logistics, Llc
Cross-Reference Index
Part NumberManufacturer
E8256 ITEM 444 Coffin Turbo Pump Inc (USA)
E8256 Coffin Turbo Pump Inc (USA)
21800 PRIMARY Coffin Turbo Pump Inc (USA)
7463 Fmc Corp Turbo Pump Operation (USA)
7463 Coffin Turbo Pump Inc (USA)
Related Parts
6645-00-163-0765INTERCHANGEABLE
WHEEL ASSEMBLY
7463
5940-00-257-5653INTERCHANGEABLE
TERMINAL,LUG
2306-08-00
4130-00-270-4465INTERCHANGEABLE
FILTER-DRIER,REFRIGERANT
5935-00-295-6403INTERCHANGEABLE
CONNECTOR,RECEPTACLE,ELECTRICAL
7321299
5330-00-350-0472INTERCHANGEABLE
GASKET
7463-000
1680-00-373-2862INTERCHANGEABLE
GRIP,CYCLIC STICK
21800
4320-00-375-8913INTERCHANGEABLE
HEAD AND LINER
9972
4730-00-407-0571INTERCHANGEABLE
COUPLING,PIPE
207ACBH-8
5821-00-510-3156INTERCHANGEABLE
BASE ASSY
5905-00-513-0697INTERCHANGEABLE
RESISTOR,VARIABLE,WIRE WOUND,NON
02000-3556
3455-00-540-2731INTERCHANGEABLE
BLADE,HOLE SAW
21800
4510-00-865-0899INTERCHANGEABLE
COVER,FAUCET HOLE
F12860

Frequently Asked Questions

What is NSN 4420-01-275-6243?

NSN 4420-01-275-6243 is a Core Assembly,fluid Cooler, manufactured by Coffin Turbo Pump Inc, classified under FSC 4420 (No Item Name Available). Status: active.

What are the part numbers for NSN 4420-01-275-6243?

NSN 4420-01-275-6243 has 5 cross-referenced part numbers: E8256 ITEM 444 (Coffin Turbo Pump Inc), E8256 (Coffin Turbo Pump Inc), 21800 (Coffin Turbo Pump Inc), 7463 (Fmc Corp Turbo Pump Operation), 7463 (Coffin Turbo Pump Inc).

What NSN replaces 4420-01-275-6243?

There are 12 known substitutes for 4420-01-275-6243: 6645-00-163-0765, 5940-00-257-5653, 4130-00-270-4465 and 9 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 21800?

Key specifications for 21800: Material: STEEL CORROSION RESISTING OVERALL; Style Designator: PLAIN COILED TUBE; End Item Identification: 4320-00-007-2638; Heat Transfer Method: INDIRECT. 4 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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