PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

21557Piston Assembly

Aerosonic Llc · NSN 6610-00-954-9825 · FSC 6610 · No Item Name Available
Verified by PartsTable
NSN 6610-00-954-9825 — this item is cataloged by the U.S. Government under National Stock Number 6610-00-954-9825. Primary manufacturer part number: 21557.
Features
  • Piston Assembly — FSC 6610
  • 1 verified cross-reference
  • Primary manufacturer: Aerosonic Llc
Applications
  • Industrial maintenance and repair
  • Government and military logistics
  • Equipment overhaul and refurbishment
General Description

The Piston Assembly, cataloged under National Stock Number 6610-00-954-9825, is classified within Federal Supply Class 6610 (No Item Name Available) of the Instruments and Laboratory Equipment group. The primary manufacturer of record is Aerosonic Llc. This item has 1 commercial cross-reference from 1 manufacturer, enabling identification through both NSN and commercial part number lookups. 7 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Catalog Facts
Item NamePiston Assembly
FSC / FSG6610 — No Item Name Available (FSG 66)
ManufacturersAerosonic Llc (CAGE 98810)
Technical Specifications
ParameterValue
NSN6610-00-954-9825
Primary Part Number21557
Item NamePiston Assembly
FSC / FSG6610 / 66 — No Item Name Available
ManufacturerAerosonic Llc
StatusACTIVE
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 7
5360-00-513-80672155-7 INTERCHANGEABLE
Spring,helical,compression
Siemens Industry, Inc. Dba Siemens Energy Div Process Industries and Drives
5905-00-534-257692296 INTERCHANGEABLE
Resistor,variable,wire Wound,pre
L3harris Technologies, Inc Div Space & Airborne Systems
5360-00-781-4943P8650A126 INTERCHANGEABLE
Spring,helical,compression
Elliott Company Div Jeannette
2940-00-880-032021076 INTERCHANGEABLE
Bowl,sediment
Monnier Inc
5360-01-352-1182AUTO1103403A INTERCHANGEABLE
Spring,helical,compression
Defense Logistics Agency Dba Defense Supply Center Philadelphia
4010-01-386-6432 INTERCHANGEABLE
Rope,wire
2640-01-651-182621557 INTERCHANGEABLE
Valve Extension,tire
Myers Tire Supply Distribution Inc Div Akron Branch
Cross-Reference Index
Part NumberManufacturer
21557 PRIMARY Aerosonic Llc (USA)
Related Parts
5360-00-513-8067INTERCHANGEABLE
SPRING,HELICAL,COMPRESSION
2155-7
5905-00-534-2576INTERCHANGEABLE
RESISTOR,VARIABLE,WIRE WOUND,PRE
92296
5360-00-781-4943INTERCHANGEABLE
SPRING,HELICAL,COMPRESSION
P8650A126
2940-00-880-0320INTERCHANGEABLE
BOWL,SEDIMENT
21076
5360-01-352-1182INTERCHANGEABLE
SPRING,HELICAL,COMPRESSION
AUTO1103403A
4010-01-386-6432INTERCHANGEABLE
ROPE,WIRE
2640-01-651-1826INTERCHANGEABLE
VALVE EXTENSION,TIRE
21557

Frequently Asked Questions

What is NSN 6610-00-954-9825?

NSN 6610-00-954-9825 is a Piston Assembly, manufactured by Aerosonic Llc, classified under FSC 6610 (No Item Name Available). Status: active.

What are the part numbers for NSN 6610-00-954-9825?

NSN 6610-00-954-9825 has 1 cross-referenced part number: 21557 (Aerosonic Llc).

What NSN replaces 6610-00-954-9825?

There are 7 known substitutes for 6610-00-954-9825: 5360-00-513-8067, 5905-00-534-2576, 5360-00-781-4943 and 4 more. Verify interchangeability with system specifications before substitution.

Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
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