The Core Assembly,fluid Cooler, cataloged under National Stock Number 4420-01-034-1388, is classified within Federal Supply Class 4420 (Heat Exchangers and Steam Condensers) of the Furnace, Steam, Drying, Nuclear Reactors group. Government technical data includes 9 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
Technical Specifications
Parameter
Value
NSN
4420-01-034-1388
Item Name
Core Assembly,fluid Cooler
FSC / FSG
4420 / 44 — Heat Exchangers and Steam Condensers
Status
ACTIVE
Core Width
7.500 INCHES NOMINAL IN
Heat Transfer Method
INDIRECT
Style Designator
STRAIGHT PLAIN TUBE, CYLINDRICAL
Tube Quantity
8
Tube Attachment Method
BRAZED BOTH ENDS
Core Length
84.000 INCHES NOMINAL IN
Tubing Outside Diameter
0.500 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN
Core Thickness
2.750 INCHES NOMINAL IN
Material
COPPER AND NICKEL ALLOY TUBES
Lifecycle & Compliance
Acquisition Status
ACTIVE
DEMIL Code
DEMIL A — No Demilitarization Required
Hazard
No hazard code in the DLA record (HMIC N)
Criticality Code
X
Cross-Reference Index
No manufacturer part numbers on file in the U.S. Government catalog.
Reference documents
Reference
Meaning
D878
3/2Design control — primary reference
U.S. Government activity
No interchangeability data on file.
Other items in FSC 4420 — Heat Exchangers and Steam Condensers
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
4420-00-003-2812
CORE ASSEMBLY,FLUID HEATER,INDUS
4420-00-004-1071
4420-00-004-1071 · Item name not on file
4420-00-004-1072
4420-00-004-1072 · Item name not on file
4420-00-004-1073
4420-00-004-1073 · Item name not on file
4420-00-004-1074
4420-00-004-1074 · Item name not on file
4420-00-004-3860
COOLER,FLUID,INDUSTRIAL
4420-00-004-5260
4420-00-004-5260 · Item name not on file
4420-00-005-2335
PURGE ORIFICE ASSEMBLY
Frequently Asked Questions
What is NSN 4420-01-034-1388?
NSN 4420-01-034-1388 is a Core Assembly,fluid Cooler, classified under FSC 4420, Heat Exchangers and Steam Condensers. Status: active.
What are the specifications of 4420-01-034-1388?
Key specifications for 4420-01-034-1388: Core Width: 7.500 INCHES NOMINAL IN; Heat Transfer Method: INDIRECT; Style Designator: STRAIGHT PLAIN TUBE, CYLINDRICAL; Tube Quantity: 8. 9 specifications are documented in the U.S. Government catalog.
Is NSN 4420-01-034-1388 hazardous material?
No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.
Sources
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
✓ Data cited from the U.S. Government catalog; commercial cross-references from OEM and certified industry sources.