PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

56591Spacer,ring

Parker Hannifin Corporation Div Hydraulic Systems Division · NSN 5365-00-783-4835 · FSC 5365 · No Item Name Available
Verified by PartsTable
NSN 5365-00-783-4835 — this item is cataloged by the U.S. Government under National Stock Number 5365-00-783-4835. Primary manufacturer part number: 56591.
Features
  • Spacer,ring — FSC 5365
  • Inside Diameter: 0.821 INCHES MINIMUM AND 0.823 INCHES MAXIMUM IN
  • Outside Diameter: 0.912 INCHES MINIMUM AND 0.918 INCHES MAXIMUM IN
  • Surface Finish: 125.0 MICROINCHES LARGEST OUTSIDE DIAMETER
  • Overall Thickness: 0.0650 INCHES MINIMUM AND 0.0655 INCHES MAXIMUM IN
  • Material Document and Classification: NO. 605,MOELLER BRASS CO. MFR REF SINGLE MATERIAL RESPONSE
  • Material: COPPER ALLOY
  • Surface Finish: 32.0 MICROINCHES RIGHT SIDE
Applications
  • Applications requiring Copper Alloy construction
General Description

The Spacer,ring, cataloged under National Stock Number 5365-00-783-4835, is classified within Federal Supply Class 5365 (No Item Name Available) of the Hardware and Abrasives group. The primary manufacturer of record is Parker Hannifin Corporation Div Hydraulic Systems Division. Government technical data includes 10 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 2 commercial cross-references from 2 manufacturers, enabling identification through both NSN and commercial part number lookups. 5 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN5365-00-783-4835
Primary Part Number56591
Item NameSpacer,ring
FSC / FSG5365 / 53 — No Item Name Available
ManufacturerParker Hannifin Corporation Div Hydraulic Systems Division
StatusACTIVE
Inside Diameter0.821 INCHES MINIMUM AND 0.823 INCHES MAXIMUM IN
Outside Diameter0.912 INCHES MINIMUM AND 0.918 INCHES MAXIMUM IN
Surface Finish125.0 MICROINCHES LARGEST OUTSIDE DIAMETER
Overall Thickness0.0650 INCHES MINIMUM AND 0.0655 INCHES MAXIMUM IN
Material Document and ClassificationNO. 605,MOELLER BRASS CO. MFR REF SINGLE MATERIAL RESPONSE
MaterialCOPPER ALLOY
Surface Finish32.0 MICROINCHES RIGHT SIDE
FSC Application Data1. MOTOR,HYDRAULIC,AIRCRAFT
Surface Finish32.0 MICROINCHES LEFT SIDE
Surface Finish32.0 MICROINCHES BORE
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 5
2910-00-541-348656951 INTERCHANGEABLE
Filter Element,fluid
Pti Technologies Inc.
5360-00-663-3343SMB187693 INTERCHANGEABLE
Spring,helical,extension
Us Army Communications & Electronics Materiel Readiness Command Logistics Engineering Dir
5340-00-990-6410100-200-16-2 INTERCHANGEABLE
Clip,spring Tension
Atlee of Delaware, Incorporated
5930-01-311-786856591 INTERCHANGEABLE
Switch,thermostatic
Alliance Laundry Systems Llc
4720-01-515-45869805 INTERCHANGEABLE
Hose Assembly,nonmetallic
Pdi Ground Support Systems, Inc.
Cross-Reference Index
Part NumberManufacturer
56591 PRIMARY Parker Hannifin Corporation Div Hydraulic Systems Division (USA)
56591 Parker-Hannifin Corporation Dba Service and Support Operation Div Services and Support Operations (USA)
Related Parts
2910-00-541-3486INTERCHANGEABLE
FILTER ELEMENT,FLUID
56951
5360-00-663-3343INTERCHANGEABLE
SPRING,HELICAL,EXTENSION
SMB187693
5340-00-990-6410INTERCHANGEABLE
CLIP,SPRING TENSION
100-200-16-2
5930-01-311-7868INTERCHANGEABLE
SWITCH,THERMOSTATIC
56591
4720-01-515-4586INTERCHANGEABLE
HOSE ASSEMBLY,NONMETALLIC
9805

Frequently Asked Questions

What is NSN 5365-00-783-4835?

NSN 5365-00-783-4835 is a Spacer,ring, manufactured by Parker Hannifin Corporation Div Hydraulic Systems Division, classified under FSC 5365 (No Item Name Available). Status: active.

What are the part numbers for NSN 5365-00-783-4835?

NSN 5365-00-783-4835 has 2 cross-referenced part numbers: 56591 (Parker Hannifin Corporation Div Hydraulic Systems Division), 56591 (Parker-Hannifin Corporation Dba Service and Support Operation Div Services and Support Operations).

What NSN replaces 5365-00-783-4835?

There are 5 known substitutes for 5365-00-783-4835: 2910-00-541-3486, 5360-00-663-3343, 5340-00-990-6410 and 2 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 56591?

Key specifications for 56591: Inside Diameter: 0.821 INCHES MINIMUM AND 0.823 INCHES MAXIMUM IN; Outside Diameter: 0.912 INCHES MINIMUM AND 0.918 INCHES MAXIMUM IN; Surface Finish: 125.0 MICROINCHES LARGEST OUTSIDE DIAMETER; Overall Thickness: 0.0650 INCHES MINIMUM AND 0.0655 INCHES MAXIMUM IN. 10 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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