PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

56439Stationary Unit

A W Chesterton Co Div Sealing Device Division · NSN 4320-01-121-0718 · FSC 4320 · No Item Name Available
Verified by PartsTable
NSN 4320-01-121-0718 — this item is cataloged by the U.S. Government under National Stock Number 4320-01-121-0718. Primary manufacturer part number: 56439.
Features
  • Stationary Unit — FSC 4320
  • 2 verified cross-references
  • Primary manufacturer: A W Chesterton Co Div Sealing Device Division
Applications
  • Hydraulic and pneumatic systems
  • Industrial process pumping
  • Military vehicle hydraulics
General Description

The Stationary Unit, cataloged under National Stock Number 4320-01-121-0718, is classified within Federal Supply Class 4320 (No Item Name Available) of the Pumps and Compressors group. The primary manufacturer of record is A W Chesterton Co Div Sealing Device Division. This item has 2 commercial cross-references from 1 manufacturer, enabling identification through both NSN and commercial part number lookups. 3 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Catalog Facts
Item NameStationary Unit
FSC / FSG4320 — No Item Name Available (FSG 43)
ManufacturersA W Chesterton Co Div Sealing Device Division (CAGE 71431)
Technical Specifications
ParameterValue
NSN4320-01-121-0718
Primary Part Number56439
Item NameStationary Unit
FSC / FSG4320 / 43 — No Item Name Available
ManufacturerA W Chesterton Co Div Sealing Device Division
StatusACTIVE
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 3
1660-00-388-000756439 INTERCHANGEABLE
Nosepiece,oxygen Mask
Mine Safety Appliances Company
5342-00-673-0443 INTERCHANGEABLE
Caster Wheel
6665-01-444-832256-439 INTERCHANGEABLE
Detector,gas
Honeywell Safety Products Usa, Inc.
Cross-Reference Index
Part NumberManufacturer
56439 PRIMARY A W Chesterton Co Div Sealing Device Division (USA)
1056439 A W Chesterton Co Div Sealing Device Division (USA)
Related Parts
1660-00-388-0007INTERCHANGEABLE
NOSEPIECE,OXYGEN MASK
56439
5342-00-673-0443INTERCHANGEABLE
CASTER WHEEL
6665-01-444-8322INTERCHANGEABLE
DETECTOR,GAS
56-439

Frequently Asked Questions

What is NSN 4320-01-121-0718?

NSN 4320-01-121-0718 is a Stationary Unit, manufactured by A W Chesterton Co Div Sealing Device Division, classified under FSC 4320 (No Item Name Available). Status: active.

What are the part numbers for NSN 4320-01-121-0718?

NSN 4320-01-121-0718 has 2 cross-referenced part numbers: 56439 (A W Chesterton Co Div Sealing Device Division), 1056439 (A W Chesterton Co Div Sealing Device Division).

What NSN replaces 4320-01-121-0718?

There are 3 known substitutes for 4320-01-121-0718: 1660-00-388-0007, 5342-00-673-0443, 6665-01-444-8322. Verify interchangeability with system specifications before substitution.

Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
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