PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

20355Piston,pump

Parker Hannifin Corporation Div Hydraulic Systems Division · NSN 4320-01-221-3735 · FSC 4320 · No Item Name Available
Verified by PartsTable
NSN 4320-01-221-3735 — this item is cataloged by the U.S. Government under National Stock Number 4320-01-221-3735. Primary manufacturer part number: 20355.
Features
  • Piston,pump — FSC 4320
  • Material: STEEL
  • Diameter: 0.500 INCHES NOMINAL IN
  • 1 verified cross-reference
  • Primary manufacturer: Parker Hannifin Corporation Div Hydraulic Systems Division
Applications
  • Fluid transfer and circulation
  • Cooling system maintenance
  • Industrial process pumping
  • Applications requiring Steel construction
General Description

The Piston,pump, cataloged under National Stock Number 4320-01-221-3735, is classified within Federal Supply Class 4320 (No Item Name Available) of the Pumps and Compressors group. The primary manufacturer of record is Parker Hannifin Corporation Div Hydraulic Systems Division. Government technical data includes 2 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 1 commercial cross-reference from 1 manufacturer, enabling identification through both NSN and commercial part number lookups. 11 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN4320-01-221-3735
Primary Part Number20355
Item NamePiston,pump
FSC / FSG4320 / 43 — No Item Name Available
ManufacturerParker Hannifin Corporation Div Hydraulic Systems Division
StatusACTIVE
MaterialSTEEL
Diameter0.500 INCHES NOMINAL IN
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 11
5950-00-026-968620355 INTERCHANGEABLE
Transformer,pulse
Raytheon Company Dba Raytheon
2815-00-042-4473 INTERCHANGEABLE
Rod,connector
5365-00-209-426701S903-135 INTERCHANGEABLE
Spacer,ring
Falls Filtration Technologies, Inc.
5940-00-549-597831681 INTERCHANGEABLE
Terminal,lug
Te Connectivity Corporation
4730-00-595-1399390002PC347 INTERCHANGEABLE
Elbow,pipe to Tube
Naval Sea Systems Command
4720-01-240-628820355 INTERCHANGEABLE
Hose,preformed
Gates Corporation
4820-01-334-410120355 INTERCHANGEABLE
Valve,check
Crissair Inc Div Esco Technologies
3040-01-364-225920355 INTERCHANGEABLE
Cap,droop Control Locking
Stanadyne Corporation Dba Stanadyne Diesel Systems Div Diesel Systems
9150-01-526-6790 INTERCHANGEABLE
Lubricating Oil,utility
6515-01-536-962520-355 INTERCHANGEABLE
Probe,lachrymal
Hu-Friedy Mfg. Co., Llc
Cross-Reference Index
Part NumberManufacturer
20355 PRIMARY Parker Hannifin Corporation Div Hydraulic Systems Division (USA)
Related Parts
5950-00-026-9686INTERCHANGEABLE
TRANSFORMER,PULSE
20355
2815-00-042-4473INTERCHANGEABLE
ROD,CONNECTOR
5365-00-209-4267INTERCHANGEABLE
SPACER,RING
01S903-135
5940-00-549-5978INTERCHANGEABLE
TERMINAL,LUG
31681
4730-00-595-1399INTERCHANGEABLE
ELBOW,PIPE TO TUBE
390002PC347
4720-01-240-6288INTERCHANGEABLE
HOSE,PREFORMED
20355
4820-01-334-4101INTERCHANGEABLE
VALVE,CHECK
20355
3040-01-364-2259INTERCHANGEABLE
CAP,DROOP CONTROL LOCKING
20355
9150-01-526-6790INTERCHANGEABLE
LUBRICATING OIL,UTILITY
6515-01-536-9625INTERCHANGEABLE
PROBE,LACHRYMAL
20-355
6910-01-590-9107INTERCHANGEABLE
COMPRESSOR,AIR,MANNEQUIN,TRAUMA
AIR-003

Frequently Asked Questions

What is NSN 4320-01-221-3735?

NSN 4320-01-221-3735 is a Piston,pump, manufactured by Parker Hannifin Corporation Div Hydraulic Systems Division, classified under FSC 4320 (No Item Name Available). Status: active.

What are the part numbers for NSN 4320-01-221-3735?

NSN 4320-01-221-3735 has 1 cross-referenced part number: 20355 (Parker Hannifin Corporation Div Hydraulic Systems Division).

What NSN replaces 4320-01-221-3735?

There are 11 known substitutes for 4320-01-221-3735: 5950-00-026-9686, 2815-00-042-4473, 5365-00-209-4267 and 8 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 20355?

Key specifications for 20355: Material: STEEL; Overall Height: 0.810 INCHES NOMINAL IN; Diameter: 0.500 INCHES NOMINAL IN. 3 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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