PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

74139-1Tank,expansion

Keco Industries, Inc. · NSN 4520-01-085-1378 · FSC 4520 · No Item Name Available
Verified by PartsTable
NSN 4520-01-085-1378 — this item is cataloged by the U.S. Government under National Stock Number 4520-01-085-1378. Primary manufacturer part number: 74139-1.
Features
  • Tank,expansion — FSC 4520
  • General Characteristics Item Description: COMPOSED OF 1 BODY,2 CAP ENDS,6 HALF COUPLINGS,DIM 30.500 IN. LG,4.500 IN. DIA O/S,4.031 IN. DIA I/S IN
  • FSC Application Data: HEATER,TRAILER MOUNTED HDU-13M
  • 3 verified cross-references
  • Primary manufacturer: Keco Industries, Inc.
Applications
  • Industrial maintenance and repair
  • Government and military logistics
  • Equipment overhaul and refurbishment
General Description

The Tank,expansion, cataloged under National Stock Number 4520-01-085-1378, is classified within Federal Supply Class 4520 (No Item Name Available) of the Plumbing, Heating, and Waste Disposal group. The primary manufacturer of record is Keco Industries, Inc.. Government technical data includes 2 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 3 commercial cross-references from 3 manufacturers, enabling identification through both NSN and commercial part number lookups. 4 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN4520-01-085-1378
Primary Part Number74139-1
Item NameTank,expansion
FSC / FSG4520 / 45 — No Item Name Available
ManufacturerKeco Industries, Inc.
StatusACTIVE
General Characteristics Item DescriptionCOMPOSED OF 1 BODY,2 CAP ENDS,6 HALF COUPLINGS,DIM 30.500 IN. LG,4.500 IN. DIA O/S,4.031 IN. DIA I/S IN
FSC Application DataHEATER,TRAILER MOUNTED HDU-13M
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 4
4710-00-200-728074139-1 INTERCHANGEABLE
Tube Assembly,metal
Curtiss-Wright Flow Control Service, Llc Dba Engineered Arresting Systems - Esco Div Cw Flow Control Svc Llc Dba
5845-00-830-208474139-1 INTERCHANGEABLE
Motor,damper
L3harris Technologies, Inc. Div Space and Airborne Systems
3110-01-012-6840741389 INTERCHANGEABLE
Bearing,ball,annular
Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney
7050-01-473-3276260 INTERCHANGEABLE
Converter,digital to Digital
Telebyte Technology Inc Remark Datacom Div
Cross-Reference Index
Part NumberManufacturer
74139-1 Keco Industries, Inc. (USA)
74139-1 Drs Environmental Systems Inc (USA)
74139-1 Hdt Expeditionary Systems Inc (USA)
Related Parts
4710-00-200-7280INTERCHANGEABLE
TUBE ASSEMBLY,METAL
74139-1
5845-00-830-2084INTERCHANGEABLE
MOTOR,DAMPER
74139-1
3110-01-012-6840INTERCHANGEABLE
BEARING,BALL,ANNULAR
741389
7050-01-473-3276INTERCHANGEABLE
CONVERTER,DIGITAL TO DIGITAL
260

Frequently Asked Questions

What is NSN 4520-01-085-1378?

NSN 4520-01-085-1378 is a Tank,expansion, manufactured by Keco Industries, Inc., classified under FSC 4520 (No Item Name Available). Status: active.

What are the part numbers for NSN 4520-01-085-1378?

NSN 4520-01-085-1378 has 3 cross-referenced part numbers: 74139-1 (Keco Industries, Inc.), 74139-1 (Drs Environmental Systems Inc), 74139-1 (Hdt Expeditionary Systems Inc).

What NSN replaces 4520-01-085-1378?

There are 4 known substitutes for 4520-01-085-1378: 4710-00-200-7280, 5845-00-830-2084, 3110-01-012-6840 and 1 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 74139-1?

Key specifications for 74139-1: General Characteristics Item Description: COMPOSED OF 1 BODY,2 CAP ENDS,6 HALF COUPLINGS,DIM 30.500 IN. LG,4.500 IN. DIA O/S,4.031 IN. DIA I/S IN; FSC Application Data: HEATER,TRAILER MOUNTED HDU-13M. 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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