PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

622/6656Diaphragm Assembly

Coffin Turbo Pump Inc · NSN 4320-01-037-4793 · FSC 4320 · No Item Name Available
Verified by PartsTable
NSN 4320-01-037-4793 — this item is cataloged by the U.S. Government under National Stock Number 4320-01-037-4793. Primary manufacturer part number: 622/6656.
Features
  • Diaphragm Assembly — FSC 4320
  • 4 verified cross-references
  • Primary manufacturer: Coffin Turbo Pump Inc
Applications
  • Hydraulic and pneumatic systems
  • Industrial process pumping
  • Military vehicle hydraulics
General Description

The Diaphragm Assembly, cataloged under National Stock Number 4320-01-037-4793, is classified within Federal Supply Class 4320 (No Item Name Available) of the Pumps and Compressors group. The primary manufacturer of record is Coffin Turbo Pump Inc. This item has 4 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.

Catalog Facts
Item NameDiaphragm Assembly
FSC / FSG4320 — No Item Name Available (FSG 43)
ManufacturersFmc Corp Turbo Pump Operation (CAGE 13380); Coffin Turbo Pump Inc (CAGE 0APJ5)
Technical Specifications
ParameterValue
NSN4320-01-037-4793
Primary Part Number622/6656
Item NameDiaphragm Assembly
FSC / FSG4320 / 43 — No Item Name Available
ManufacturerCoffin Turbo Pump Inc
StatusACTIVE
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 12
5133-00-061-628844476 INTERCHANGEABLE
Drill,twist
Greenfield Industries Inc
5305-00-151-104695-102 INTERCHANGEABLE
Screw,machine
Meggitt Aircraft Braking Systems Corporation
3120-00-237-76826656 INTERCHANGEABLE
Bearing,sleeve
Quincy Compressor Division of Coltec Industries Inc Dba Quincy Compressor Div Quincy Compressor
4940-00-318-9078 INTERCHANGEABLE
Adapter
5950-00-418-3822SM-B-619160 INTERCHANGEABLE
Transformer,audio Frequency
Us Army Communications & Electronics Materiel Readiness Command Logistics Engineering Dir
4820-00-450-9840665-6 INTERCHANGEABLE
Cartridge,check Valve
Admiral Valve Llc Dba Cpv Manufacturing
5330-00-556-7134 INTERCHANGEABLE
Packing Material
5331-00-599-2255MS29513-257 INTERCHANGEABLE
O-Ring
Sae International Dba Sae International
4820-00-690-20686656 INTERCHANGEABLE
Diaphragm,valve,flat
Imi Cash Valve Inc
5950-00-813-8352SM-D-415301 INTERCHANGEABLE
Transformer,audio Frequency
Us Army Communications & Electronics Materiel Readiness Command Logistics Engineering Dir
Cross-Reference Index
Part NumberManufacturer
16656 Fmc Corp Turbo Pump Operation (USA)
6656 Fmc Corp Turbo Pump Operation (USA)
622/6656 PRIMARY Coffin Turbo Pump Inc (USA)
A6656 Fmc Corp Turbo Pump Operation (USA)
Related Parts
5133-00-061-6288INTERCHANGEABLE
DRILL,TWIST
44476
5305-00-151-1046INTERCHANGEABLE
SCREW,MACHINE
95-102
3120-00-237-7682INTERCHANGEABLE
BEARING,SLEEVE
6656
4940-00-318-9078INTERCHANGEABLE
ADAPTER
5950-00-418-3822INTERCHANGEABLE
TRANSFORMER,AUDIO FREQUENCY
SM-B-619160
4820-00-450-9840INTERCHANGEABLE
CARTRIDGE,CHECK VALVE
665-6
5330-00-556-7134INTERCHANGEABLE
PACKING MATERIAL
5331-00-599-2255INTERCHANGEABLE
O-RING
MS29513-257
4820-00-690-2068INTERCHANGEABLE
DIAPHRAGM,VALVE,FLAT
6656
5950-00-813-8352INTERCHANGEABLE
TRANSFORMER,AUDIO FREQUENCY
SM-D-415301
5950-00-947-6643INTERCHANGEABLE
COIL,RADIO FREQUENCY
5330-01-295-6829INTERCHANGEABLE
RETAINER,PACKING
6656

Frequently Asked Questions

What is NSN 4320-01-037-4793?

NSN 4320-01-037-4793 is a Diaphragm Assembly, manufactured by Coffin Turbo Pump Inc, classified under FSC 4320 (No Item Name Available). Status: active.

What are the part numbers for NSN 4320-01-037-4793?

NSN 4320-01-037-4793 has 4 cross-referenced part numbers: 16656 (Fmc Corp Turbo Pump Operation), 6656 (Fmc Corp Turbo Pump Operation), 622/6656 (Coffin Turbo Pump Inc), A6656 (Fmc Corp Turbo Pump Operation).

What NSN replaces 4320-01-037-4793?

There are 12 known substitutes for 4320-01-037-4793: 5133-00-061-6288, 5305-00-151-1046, 3120-00-237-7682 and 9 more. Verify interchangeability with system specifications before substitution.

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