PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet
MRO / Engines, Turbines, and Components / 2805-00-391-3210

21003Ring,piston

Briggs and Stratton Corp · NSN 2805-00-391-3210 · FSC 2805 · No Item Name Available
Verified by PartsTable
NSN 2805-00-391-3210 — this item is cataloged by the U.S. Government under National Stock Number 2805-00-391-3210. Primary manufacturer part number: 21003.
MRO FSG 28 NO ITEM NAME AVAILABLE Technical Drawing
2805-00-391-3210 — No Item Name Available illustration
Features
  • Ring,piston — FSC 2805
  • Cross-Sectional Shape Style: STRAIGHT FACE, BOTTOM RELIEF
  • Radial Wall Thickness: 0.1350 INCHES NOMINAL IN
  • FSC Application Data: GASOLINE ENGINE,NONAIRCRAFT
  • Material: IRON OVERALL
  • Standard Bore Diameter: 3.000 INCHES IN
  • Joint Style: VERTICAL JOINT
  • Bore Diameter Oversize: 0.010 INCHES IN
Applications
  • Applications requiring Iron Overall construction
General Description

The Ring,piston, cataloged under National Stock Number 2805-00-391-3210, is classified within Federal Supply Class 2805 (No Item Name Available) of the Engines, Turbines, and Components group. The primary manufacturer of record is Briggs and Stratton Corp. Government technical data includes 8 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: Cancelled.

Technical Specifications
ParameterValue
NSN2805-00-391-3210
Primary Part Number21003
Item NameRing,piston
FSC / FSG2805 / 28 — No Item Name Available
ManufacturerBriggs and Stratton Corp
StatusCANCELLED
Cross-Sectional Shape StyleSTRAIGHT FACE, BOTTOM RELIEF
Radial Wall Thickness0.1350 INCHES NOMINAL IN
FSC Application DataGASOLINE ENGINE,NONAIRCRAFT
MaterialIRON OVERALL
Standard Bore Diameter3.000 INCHES IN
Joint StyleVERTICAL JOINT
Bore Diameter Oversize0.010 INCHES IN
Ring StyleCONCENTRIC
Lifecycle & Compliance
Acquisition StatusCANCELLED
HAZMATNo
⇄ Verified Substitutes 12
5998-00-170-6721 INTERCHANGEABLE
Electronic Components Assembly
5120-00-204-053021003 INTERCHANGEABLE
Face,hammer,inserted
Garland Manufacturing Co Dba Garland Manufacturing Co Div Uhmw Polyethylene Division
5325-00-276-42487431654-118 INTERCHANGEABLE
Grommet,nonmetallic
Westinghouse Electric Corp
5960-00-521-022121003 INTERCHANGEABLE
Retainer,electron,t
Leica Inc Surveying and Photogrammetry Systems Div
5325-00-597-51762100-3 INTERCHANGEABLE
Insert,screw Thread
Nafco Usa Llc
5950-00-787-7044 INTERCHANGEABLE
Coil,radio Frequency
5325-00-803-7304 INTERCHANGEABLE
Ring,retaining
5940-00-983-6114 INTERCHANGEABLE
Terminal Board
6685-00-994-102765C INTERCHANGEABLE
Thermometer,self-Indicating
Weksler Glass Thermometer Corp
4130-01-017-3319456295 INTERCHANGEABLE
Filter Element,air Conditioning
Donaldson Company, Inc.
Cross-Reference Index
Part NumberManufacturer
21003 PRIMARY Briggs and Stratton Corp (USA)
21003 Mid-States Auto Electric (USA)
Related Parts
5998-00-170-6721INTERCHANGEABLE
ELECTRONIC COMPONENTS ASSEMBLY
5120-00-204-0530INTERCHANGEABLE
FACE,HAMMER,INSERTED
21003
5325-00-276-4248INTERCHANGEABLE
GROMMET,NONMETALLIC
7431654-118
5960-00-521-0221INTERCHANGEABLE
RETAINER,ELECTRON,T
21003
5325-00-597-5176INTERCHANGEABLE
INSERT,SCREW THREAD
2100-3
5950-00-787-7044INTERCHANGEABLE
COIL,RADIO FREQUENCY
5325-00-803-7304INTERCHANGEABLE
RING,RETAINING
5940-00-983-6114INTERCHANGEABLE
TERMINAL BOARD
6685-00-994-1027INTERCHANGEABLE
THERMOMETER,SELF-INDICATING
65C
4130-01-017-3319INTERCHANGEABLE
FILTER ELEMENT,AIR CONDITIONING
456295
5961-01-249-4469INTERCHANGEABLE
SEMICONDUCTOR DEVICE,DIODE
21003
9330-01-255-5405INTERCHANGEABLE
TUBING,PLASTIC,SPIRAL WRAP
706751

Frequently Asked Questions

What is NSN 2805-00-391-3210?

NSN 2805-00-391-3210 is a Ring,piston, manufactured by Briggs and Stratton Corp, classified under FSC 2805 (No Item Name Available). Status: cancelled.

What are the part numbers for NSN 2805-00-391-3210?

NSN 2805-00-391-3210 has 2 cross-referenced part numbers: 21003 (Briggs and Stratton Corp), 21003 (Mid-States Auto Electric).

What NSN replaces 2805-00-391-3210?

There are 12 known substitutes for 2805-00-391-3210: 5998-00-170-6721, 5120-00-204-0530, 5325-00-276-4248 and 9 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 21003?

Key specifications for 21003: Cross-Sectional Shape Style: STRAIGHT FACE, BOTTOM RELIEF; Radial Wall Thickness: 0.1350 INCHES NOMINAL IN; FSC Application Data: GASOLINE ENGINE,NONAIRCRAFT; Material: IRON OVERALL. 9 total characteristics are documented in the Federal Logistics Information System.

Is NSN 2805-00-391-3210 still in active supply?

NSN 2805-00-391-3210 is currently cancelled. Check with the Defense Logistics Agency for current availability and authorized substitutes.

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