PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

23521Piston,internal Combustion Engin

Pratt & Whitney Canada Corp Div Pratt & Whitney Canada Corp. · NSN 2810-00-118-9025 · FSC 2810 · No Item Name Available
Verified by PartsTable
NSN 2810-00-118-9025 — this item is cataloged by the U.S. Government under National Stock Number 2810-00-118-9025. Primary manufacturer part number: 23521.
Features
  • Piston,internal Combustion Engin — FSC 2810
  • Ring Groove Diameter: 5.207 INCHES NOMINAL FOURTH RING IN
  • Ring Groove Diameter: 5.292 INCHES NOMINAL FIRST RING IN
  • Ring Groove Diameter: 5.292 INCHES NOMINAL THIRD RING IN
  • Distance Between Pin Bosses: 2.313 INCHES NOMINAL IN
  • Pinhole Diameter: 1.3730 INCHES NOMINAL IN
  • Retaining Ring Groove: NOT INCLUDED
  • Skirt Bottom Cutaway Feature: NOT INCLUDED
Applications
  • Applications requiring Aluminum construction
General Description

The Piston,internal Combustion Engin, cataloged under National Stock Number 2810-00-118-9025, is classified within Federal Supply Class 2810 (No Item Name Available) of the Engines, Turbines, and Components group. The primary manufacturer of record is Pratt & Whitney Canada Corp Div Pratt & Whitney Canada Corp.. Government technical data includes 28 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. 12 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN2810-00-118-9025
Primary Part Number23521
Item NamePiston,internal Combustion Engin
FSC / FSG2810 / 28 — No Item Name Available
ManufacturerPratt & Whitney Canada Corp Div Pratt & Whitney Canada Corp.
StatusACTIVE
Ring Groove Diameter5.207 INCHES NOMINAL FOURTH RING IN
Ring Groove Diameter5.292 INCHES NOMINAL FIRST RING IN
Ring Groove Diameter5.292 INCHES NOMINAL THIRD RING IN
Distance Between Pin Bosses2.313 INCHES NOMINAL IN
Pinhole Diameter1.3730 INCHES NOMINAL IN
Retaining Ring GrooveNOT INCLUDED
Skirt Bottom Cutaway FeatureNOT INCLUDED
Head StyleCONCAVE
Finished Size DesignationSTANDARD
PinNOT INCLUDED
Diameter5.728 INCHES NOMINAL IN
Pin Type for Which DesignedFLOATING
Ring Groove Diameter5.292 INCHES NOMINAL SECOND RING IN
Unable to DecodeUNABLE TO DECODE
MaterialALUMINUM
Surface FinishFINISHED
Ring Groove Quantity5
Ring Groove Diameter5.327 INCHES NOMINAL FIFTH RING IN
Carbon GrooveNOT INCLUDED
Pin Hole BushingNOT INCLUDED
Oil GrooveNOT INCLUDED
Skirt TypeSOLID
Distance From Pin Hole Center to Extreme Top2.706 INCHES NOMINAL IN
FSC Application DataACFT ENG R1340
RingNOT INCLUDED
Oil Passage TypeHOLE LOCATION NOT OTHERWISE SPECIFIED
Ring Groove Width0.1330 INCHES NOMINAL AND 0.1310 INCHES NOMINAL AND 0.1290 INCHES NOMINAL AND 0.2210 INCHES NOMINAL AND 0.1270 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN
Ring Groove Position and QuantityNUMBER 1,NUMBER 2,NUMBER 3,NUMBER 4,NUMBER 5 PISTON ALL RINGS
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 12
5999-00-035-789323-521 INTERCHANGEABLE
Contact,electrical
Eaton Corp Opns & Technical Center
5950-00-648-540323521 INTERCHANGEABLE
Transformer,power
L3harris Technologies, Inc Div Space & Airborne Systems
5985-00-723-4628MX-1554A/U INTERCHANGEABLE
Seal,radio Frequency Transmissio
Joint Electronics Type Designation System
5940-00-784-304910-910-2 INTERCHANGEABLE
Terminal,stud
Concord Electronics, Inc.
3010-00-824-268423521 INTERCHANGEABLE
Coupling,shaft,flexible
Senior Operations Llc Dba Metal Bellows Div Metal Bellows
5340-00-854-018823521 INTERCHANGEABLE
Standoff,threaded,spacing
Hamilton Sundstrand Corporation Dba Collins Aerospace
5950-01-072-994612282754 INTERCHANGEABLE
Transformer,power
U S Army Tank Automotive Command Amsta-Im-Mm
5998-01-220-2243 INTERCHANGEABLE
Circuit Card Assembly
5950-01-348-9868 INTERCHANGEABLE
Transformer,power
5310-01-382-502023521 INTERCHANGEABLE
Nut,plain,hexagon
Naval Inventory Control Point Mechanicsburg
Cross-Reference Index
Part NumberManufacturer
23521 Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney (USA)
23521 PRIMARY Pratt & Whitney Canada Corp Div Pratt & Whitney Canada Corp. (CAN)
Related Parts
5999-00-035-7893INTERCHANGEABLE
CONTACT,ELECTRICAL
23-521
5950-00-648-5403INTERCHANGEABLE
TRANSFORMER,POWER
23521
5985-00-723-4628INTERCHANGEABLE
SEAL,RADIO FREQUENCY TRANSMISSIO
MX-1554A/U
5940-00-784-3049INTERCHANGEABLE
TERMINAL,STUD
10-910-2
3010-00-824-2684INTERCHANGEABLE
COUPLING,SHAFT,FLEXIBLE
23521
5340-00-854-0188INTERCHANGEABLE
STANDOFF,THREADED,SPACING
23521
5950-01-072-9946INTERCHANGEABLE
TRANSFORMER,POWER
12282754
5998-01-220-2243INTERCHANGEABLE
CIRCUIT CARD ASSEMBLY
5950-01-348-9868INTERCHANGEABLE
TRANSFORMER,POWER
5310-01-382-5020INTERCHANGEABLE
NUT,PLAIN,HEXAGON
23521
6130-01-442-4090INTERCHANGEABLE
BATTERY POWER SUPPLY
23521
4820-01-553-0468INTERCHANGEABLE
VALVE,SAFETY RELIEF
23521

Frequently Asked Questions

What is NSN 2810-00-118-9025?

NSN 2810-00-118-9025 is a Piston,internal Combustion Engin, manufactured by Pratt & Whitney Canada Corp Div Pratt & Whitney Canada Corp., classified under FSC 2810 (No Item Name Available). Status: active.

What are the part numbers for NSN 2810-00-118-9025?

NSN 2810-00-118-9025 has 2 cross-referenced part numbers: 23521 (Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney), 23521 (Pratt & Whitney Canada Corp Div Pratt & Whitney Canada Corp.).

What NSN replaces 2810-00-118-9025?

There are 12 known substitutes for 2810-00-118-9025: 5999-00-035-7893, 5950-00-648-5403, 5985-00-723-4628 and 9 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 23521?

Key specifications for 23521: Ring Groove Diameter: 5.207 INCHES NOMINAL FOURTH RING IN; Ring Groove Diameter: 5.292 INCHES NOMINAL FIRST RING IN; Ring Groove Diameter: 5.292 INCHES NOMINAL THIRD RING IN; Distance Between Pin Bosses: 2.313 INCHES NOMINAL IN. 30 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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