PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

WS-280BPump,reciprocating

Imtra Corp · NSN 4320-01-407-0990 · FSC 4320 · No Item Name Available
Verified by PartsTable
NSN 4320-01-407-0990 — this item is cataloged by the U.S. Government under National Stock Number 4320-01-407-0990. Primary manufacturer part number: WS-280B.
Features
  • Pump,reciprocating — FSC 4320
  • Pumping Element Type: PISTON
  • Cylinder Quantity: 1
  • Operation Method: MANUAL
  • Pump Reciprocating Design: SINGLE ACTING
  • Pumping Element Operating Position: HORIZONTAL
  • Intake Connection Type: THREADED INTERNAL
  • Reciprocating Stroke Type: FIXED
Applications
  • Fluid transfer and circulation
  • Cooling system maintenance
  • Industrial process pumping
General Description

The Pump,reciprocating, cataloged under National Stock Number 4320-01-407-0990, is classified within Federal Supply Class 4320 (No Item Name Available) of the Pumps and Compressors group. The primary manufacturer of record is Imtra Corp. Government technical data includes 12 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 6 commercial cross-references from 4 manufacturers, enabling identification through both NSN and commercial part number lookups. 9 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Cancelled.

Technical Specifications
ParameterValue
NSN4320-01-407-0990
Primary Part NumberWS-280B
Item NamePump,reciprocating
FSC / FSG4320 / 43 — No Item Name Available
ManufacturerImtra Corp
StatusCANCELLED
Pumping Element TypePISTON
Cylinder Quantity1
Operation MethodMANUAL
Pump Reciprocating DesignSINGLE ACTING
Pumping Element Operating PositionHORIZONTAL
Intake Connection TypeTHREADED INTERNAL
Reciprocating Stroke TypeFIXED
Maximum Discharge Flow Rate1.0 GALLONS PER MINUTE
Intake Connection Thread Size and Series/type Designator0.7500-14 NPT
Media for Which DesignedOIL
Discharge Connection Quantity1
Intake Connection Quantity1
Lifecycle & Compliance
Acquisition StatusCANCELLED
HAZMATNo
Verified Substitutes 9
4730-01-309-9977259-2024-4-6 INTERCHANGEABLE
Elbow,pipe to Tube
Danfoss Power Solutions II, Llc
4730-01-398-85282023-6-8B INTERCHANGEABLE
Elbow,pipe to Tube
Danfoss Power Solutions II, Llc
4730-01-399-10653914579 INTERCHANGEABLE
Adapter,straight,tube to Hose
Cummins Inc.
4720-01-399-1853CF-02 INTERCHANGEABLE
Parts Kit,hose Assembly,nonmetal
Hynautic Inc Div of Sta-Rite Industries Inc
2040-01-399-5793328-6A INTERCHANGEABLE
Connector,thru-Hull
Perko Inc
4820-01-406-0358BBV-38 INTERCHANGEABLE
Valve,ball
Dvcc, Llc
4820-01-406-0360BBV-25 INTERCHANGEABLE
Valve,ball
Dvcc, Llc
4320-01-407-0986 INTERCHANGEABLE
Parts Kit,reciprocating Pump
4320-01-407-0993WSK-280 INTERCHANGEABLE
Parts Kit,reciprocating Pump
Imtra Corp
Cross-Reference Index
Part NumberManufacturer
WS-28B Imtra Corp (USA)
WS-28B Southern Pacific Corp (USA)
WB-280B Imtra Corp (USA)
5105293 Naval Sea Systems Command (USA)
WS-280B PRIMARY Imtra Corp (USA)
WS-28B White Star Products Ltd (NZL)
Related Parts
4730-01-309-9977INTERCHANGEABLE
ELBOW,PIPE TO TUBE
259-2024-4-6
4730-01-398-8528INTERCHANGEABLE
ELBOW,PIPE TO TUBE
2023-6-8B
4730-01-399-1065INTERCHANGEABLE
ADAPTER,STRAIGHT,TUBE TO HOSE
3914579
4720-01-399-1853INTERCHANGEABLE
PARTS KIT,HOSE ASSEMBLY,NONMETAL
CF-02
2040-01-399-5793INTERCHANGEABLE
CONNECTOR,THRU-HULL
328-6A
4820-01-406-0358INTERCHANGEABLE
VALVE,BALL
BBV-38
4820-01-406-0360INTERCHANGEABLE
VALVE,BALL
BBV-25
4320-01-407-0986INTERCHANGEABLE
PARTS KIT,RECIPROCATING PUMP
4320-01-407-0993INTERCHANGEABLE
PARTS KIT,RECIPROCATING PUMP
WSK-280

Frequently Asked Questions

What is NSN 4320-01-407-0990?

NSN 4320-01-407-0990 is a Pump,reciprocating, manufactured by Imtra Corp, classified under FSC 4320 (No Item Name Available). Status: cancelled.

What are the part numbers for NSN 4320-01-407-0990?

NSN 4320-01-407-0990 has 6 cross-referenced part numbers: WS-28B (Imtra Corp), WS-28B (Southern Pacific Corp), WB-280B (Imtra Corp), 5105293 (Naval Sea Systems Command), WS-280B (Imtra Corp) and 1 more.

What NSN replaces 4320-01-407-0990?

There are 9 known substitutes for 4320-01-407-0990: 4730-01-309-9977, 4730-01-398-8528, 4730-01-399-1065 and 6 more. Verify interchangeability with system specifications before substitution.

What are the specifications of WS-280B?

Key specifications for WS-280B: Pumping Element Type: PISTON; Cylinder Quantity: 1; Operation Method: MANUAL; Pump Reciprocating Design: SINGLE ACTING. 13 total characteristics are documented in the Federal Logistics Information System.

Is NSN 4320-01-407-0990 still in active supply?

NSN 4320-01-407-0990 is currently cancelled. Check with the Defense Logistics Agency for current availability and authorized substitutes.

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