PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

X78-4-25Ring,piston

Parker Hannifin Corporation Div Cylinder Division · NSN 3040-01-017-6319 · FSC 3040 · No Item Name Available
Verified by PartsTable
NSN 3040-01-017-6319 — this item is cataloged by the U.S. Government under National Stock Number 3040-01-017-6319. Primary manufacturer part number: X78-4-25.
Features
  • Ring,piston — FSC 3040
  • Material: IRON OVERALL
  • Cross-Sectional Shape Style: PLAIN RECTANGULAR, STRAIGHT FACE
  • Ring Style: CONCENTRIC
  • Joint Style: STEP JOINT
  • Radial Wall Thickness: 0.1210 INCHES NOMINAL IN
  • Standard Bore Diameter: 3.750 INCHES IN
  • 4 verified cross-references
Applications
  • Applications requiring Iron Overall construction
General Description

The Ring,piston, cataloged under National Stock Number 3040-01-017-6319, is classified within Federal Supply Class 3040 (No Item Name Available) of the Mechanical Power Transmission Equipment group. The primary manufacturer of record is Parker Hannifin Corporation Div Cylinder Division. Government technical data includes 6 verified specifications, sourced from the Federal Logistics Information System (FLIS). 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.

Technical Specifications
ParameterValue
NSN3040-01-017-6319
Primary Part NumberX78-4-25
Item NameRing,piston
FSC / FSG3040 / 30 — No Item Name Available
ManufacturerParker Hannifin Corporation Div Cylinder Division
StatusACTIVE
MaterialIRON OVERALL
Cross-Sectional Shape StylePLAIN RECTANGULAR, STRAIGHT FACE
Ring StyleCONCENTRIC
Joint StyleSTEP JOINT
Radial Wall Thickness0.1210 INCHES NOMINAL IN
Standard Bore Diameter3.750 INCHES IN
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 12
6145-00-167-7459KS10517-36 INTERCHANGEABLE
Cable,special Purpose,electrical
Kaman Aerospace Corporation Dba Air Vehicles & Mro Division
2915-00-171-0077 INTERCHANGEABLE
Cover Assembly
6140-00-190-9828 INTERCHANGEABLE
Battery,storage
1560-00-244-472210865 INTERCHANGEABLE
Cable Assembly,rudd
Piper Industrial Manufacturing Company, Llc Div Piper Industrial Manufacturing Company
2530-00-529-420945Z225 INTERCHANGEABLE
Parts Kit,hydraulic Brake Wheel
Morris Material Handling, Inc.
4320-01-036-3896 INTERCHANGEABLE
Ring,wearing
5330-01-037-719267X904 INTERCHANGEABLE
Seal,plain Encased
Garlock Sealing Technologies Llc Dba Garlock Sealing Technologies Llc
5950-01-084-0632 INTERCHANGEABLE
Coil,radio Frequency
5310-01-127-5262113712 INTERCHANGEABLE
Washer
Cone Drive Operations Inc
4140-01-190-3279 INTERCHANGEABLE
Impeller,fan,axial
Cross-Reference Index
Part NumberManufacturer
D-10865 Komatsu America Corporation (USA)
113712 Komatsu America Corporation (USA)
X78-4-25 PRIMARY Parker Hannifin Corporation Div Cylinder Division (USA)
10865 Komatsu America Corporation (USA)
Related Parts
6145-00-167-7459INTERCHANGEABLE
CABLE,SPECIAL PURPOSE,ELECTRICAL
KS10517-36
2915-00-171-0077INTERCHANGEABLE
COVER ASSEMBLY
6140-00-190-9828INTERCHANGEABLE
BATTERY,STORAGE
1560-00-244-4722INTERCHANGEABLE
CABLE ASSEMBLY,RUDD
10865
2530-00-529-4209INTERCHANGEABLE
PARTS KIT,HYDRAULIC BRAKE WHEEL
45Z225
4320-01-036-3896INTERCHANGEABLE
RING,WEARING
5330-01-037-7192INTERCHANGEABLE
SEAL,PLAIN ENCASED
67X904
5950-01-084-0632INTERCHANGEABLE
COIL,RADIO FREQUENCY
5310-01-127-5262INTERCHANGEABLE
WASHER
113712
4140-01-190-3279INTERCHANGEABLE
IMPELLER,FAN,AXIAL
2940-01-211-1054INTERCHANGEABLE
FILTER ELEMENT,FLUID
11-9099
4320-01-243-4879INTERCHANGEABLE
PARTS KIT,CENTRIFUGAL PUMP
10865

Frequently Asked Questions

What is NSN 3040-01-017-6319?

NSN 3040-01-017-6319 is a Ring,piston, manufactured by Parker Hannifin Corporation Div Cylinder Division, classified under FSC 3040 (No Item Name Available). Status: active.

What are the part numbers for NSN 3040-01-017-6319?

NSN 3040-01-017-6319 has 4 cross-referenced part numbers: D-10865 (Komatsu America Corporation), 113712 (Komatsu America Corporation), X78-4-25 (Parker Hannifin Corporation Div Cylinder Division), 10865 (Komatsu America Corporation).

What NSN replaces 3040-01-017-6319?

There are 12 known substitutes for 3040-01-017-6319: 6145-00-167-7459, 2915-00-171-0077, 6140-00-190-9828 and 9 more. Verify interchangeability with system specifications before substitution.

What are the specifications of X78-4-25?

Key specifications for X78-4-25: Material: IRON OVERALL; Cross-Sectional Shape Style: PLAIN RECTANGULAR, STRAIGHT FACE; Ring Style: CONCENTRIC; Overall Width: 0.2470 INCHES NOMINAL IN. 7 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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