PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

6550X3Piston

David Brown Hydraulics Inc Dba Hydreco · NSN 2590-00-499-9850 · FSC 2590 · No Item Name Available
Verified by PartsTable
NSN 2590-00-499-9850 — this item is cataloged by the U.S. Government under National Stock Number 2590-00-499-9850. Primary manufacturer part number: 6550X3.
Features
  • Piston — FSC 2590
  • General Characteristics Item Description: STEEL;4.994 IN.FLANGE OD,0.700 IN.THK;4.598 IN. BODY OD,0.838 IN.LG;2.748 IN.HUB OD,0.329 IN.LG;INTERNAL THD 1.937-6 UN,1.110 IN.THD LG IN
  • 2 verified cross-references
  • Primary manufacturer: David Brown Hydraulics Inc Dba Hydreco
Applications
  • Industrial maintenance and repair
  • Government and military logistics
  • Equipment overhaul and refurbishment
General Description

The Piston, cataloged under National Stock Number 2590-00-499-9850, is classified within Federal Supply Class 2590 (No Item Name Available) of the Vehicular Equipment Components group. The primary manufacturer of record is David Brown Hydraulics Inc Dba Hydreco. Government technical data includes 1 verified specification, 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. 10 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN2590-00-499-9850
Primary Part Number6550X3
Item NamePiston
FSC / FSG2590 / 25 — No Item Name Available
ManufacturerDavid Brown Hydraulics Inc Dba Hydreco
StatusACTIVE
General Characteristics Item DescriptionSTEEL;4.994 IN.FLANGE OD,0.700 IN.THK;4.598 IN. BODY OD,0.838 IN.LG;2.748 IN.HUB OD,0.329 IN.LG;INTERNAL THD 1.937-6 UN,1.110 IN.THD LG IN
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 10
1015-00-047-41327974827 INTERCHANGEABLE
Valve Assembly,pres
U S Army Tank Automotive Command Amsta-Im-Mm
6685-00-585-1141 INTERCHANGEABLE
Gage,pressure,dial Indicating
3120-01-187-958127561 INTERCHANGEABLE
Bushing,sleeve
Moog Inc. Dba Ampac-Isp Corp
5330-01-270-832727561 INTERCHANGEABLE
Gasket
Landoll Company, Llc
3020-01-366-390527561 INTERCHANGEABLE
Gear,antibacklash,spur
Elbitamerica, Inc.
3950-01-391-9881 INTERCHANGEABLE
Parts Kit,hoist,chain
3040-01-457-9211 INTERCHANGEABLE
Shaft Assembly,flexible
5305-01-548-474529936 INTERCHANGEABLE
Screw,cap,hexagon Head
Eagle Components, Inc
5305-01-580-7480 INTERCHANGEABLE
Screw,cap,hexagon Head
5305-01-611-849527561 INTERCHANGEABLE
Screw,machine
Fastenal Company Dba Fastenal Co
Cross-Reference Index
Part NumberManufacturer
27561 Hyster-Yale Group, Inc. (USA)
6550X3 PRIMARY David Brown Hydraulics Inc Dba Hydreco (USA)
Related Parts
1015-00-047-4132INTERCHANGEABLE
VALVE ASSEMBLY,PRES
7974827
6685-00-585-1141INTERCHANGEABLE
GAGE,PRESSURE,DIAL INDICATING
3120-01-187-9581INTERCHANGEABLE
BUSHING,SLEEVE
27561
5330-01-270-8327INTERCHANGEABLE
GASKET
27561
3020-01-366-3905INTERCHANGEABLE
GEAR,ANTIBACKLASH,SPUR
27561
3950-01-391-9881INTERCHANGEABLE
PARTS KIT,HOIST,CHAIN
3040-01-457-9211INTERCHANGEABLE
SHAFT ASSEMBLY,FLEXIBLE
5305-01-548-4745INTERCHANGEABLE
SCREW,CAP,HEXAGON HEAD
29936
5305-01-580-7480INTERCHANGEABLE
SCREW,CAP,HEXAGON HEAD
5305-01-611-8495INTERCHANGEABLE
SCREW,MACHINE
27561

Frequently Asked Questions

What is NSN 2590-00-499-9850?

NSN 2590-00-499-9850 is a Piston, manufactured by David Brown Hydraulics Inc Dba Hydreco, classified under FSC 2590 (No Item Name Available). Status: active.

What are the part numbers for NSN 2590-00-499-9850?

NSN 2590-00-499-9850 has 2 cross-referenced part numbers: 27561 (Hyster-Yale Group, Inc.), 6550X3 (David Brown Hydraulics Inc Dba Hydreco).

What NSN replaces 2590-00-499-9850?

There are 10 known substitutes for 2590-00-499-9850: 1015-00-047-4132, 6685-00-585-1141, 3120-01-187-9581 and 7 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 6550X3?

Key specifications for 6550X3: General Characteristics Item Description: STEEL;4.994 IN.FLANGE OD,0.700 IN.THK;4.598 IN. BODY OD,0.838 IN.LG;2.748 IN.HUB OD,0.329 IN.LG;INTERNAL THD 1.937-6 UN,1.110 IN.THD LG IN. 1 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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