PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

26521Valve,poppet,engine

Briggs and Stratton Corp · NSN 2805-00-351-6344 · FSC 2805 · No Item Name Available
Verified by PartsTable
NSN 2805-00-351-6344 — this item is cataloged by the U.S. Government under National Stock Number 2805-00-351-6344. Primary manufacturer part number: 26521.
Features
  • Valve,poppet,engine — FSC 2805
  • Stem Length: 3.7969 INCHES NOMINAL IN
  • Stem Diameter: 0.3100 INCHES NOMINAL IN
  • Groove Diameter: 0.2500 INCHES NOMINAL IN
  • Seat Angle in Deg: 45.0
  • Material: COBALT ALLOY TIP
  • FSC Application Data: GASOLINE ENGINE
  • Head Style: MUSHROOM
Applications
  • Flow control in piping systems
  • Pressure regulation
  • Steam and fluid isolation
  • Mechanical power generation
  • Drive system operation
General Description

The Valve,poppet,engine, cataloged under National Stock Number 2805-00-351-6344, 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 19 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 4 commercial cross-references from 4 manufacturers, enabling identification through both NSN and commercial part number lookups. 10 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Cancelled.

Technical Specifications
ParameterValue
NSN2805-00-351-6344
Primary Part Number26521
Item NameValve,poppet,engine
FSC / FSG2805 / 28 — No Item Name Available
ManufacturerBriggs and Stratton Corp
StatusCANCELLED
Stem Length3.7969 INCHES NOMINAL IN
Stem Diameter0.3100 INCHES NOMINAL IN
Groove Diameter0.2500 INCHES NOMINAL IN
Seat Angle in Deg45.0
MaterialCOBALT ALLOY TIP
FSC Application DataGASOLINE ENGINE
Head StyleMUSHROOM
Groove Width0.2656 INCHES NOMINAL IN
Neck Radius0.2187 INCHES NOMINAL IN
Head Height0.1719 INCHES NOMINAL IN
Chamfer Length0.0469 INCHES NOMINAL IN
Outside Diameter1.1250 INCHES NOMINAL IN
MaterialSTEEL COMP 8640 STEM
Stem StyleGROOVED
MaterialCOBALT ALLOY SEAT FACE
Distance From Groove to Stem End0.1875 INCHES NOMINAL IN
Carbon Relief GrooveNOT INCLUDED
Material Document and ClassificationFED STD 66 FED STD SINGLE MATERIAL RESPONSE OR AISI 8640 ASSN STD SINGLE MATERIAL RESPONSE OR SAE 8640 ASSN STD SINGLE MATERIAL RESPONSE STEM
Chamfer Angle in Deg30.0
Lifecycle & Compliance
Acquisition StatusCANCELLED
HAZMATNo
Verified Substitutes 10
5330-00-084-12302652-1 INTERCHANGEABLE
Gasket
Rockwell Collins, Inc. Dba Rc Displays Systems
2915-00-370-90782-652-1 INTERCHANGEABLE
Fuel Float Valve Assembly
Parker Hannifin Corporation Div Aerospace Group Headquarters
5930-00-448-0001815-1853067SYM2652-1 INTERCHANGEABLE
Switch,magnet
Naval Ship Systems Command
2915-00-580-94089-253-51 INTERCHANGEABLE
Valve,float,aircraft Fuel Tank
Parker Hannifin Corporation Div Aerospace Group Headquarters
6615-00-786-708126521 INTERCHANGEABLE
Nut,synchro,lock
Parker-Hannifin Corporation Dba Control Systems Division
5620-00-982-8182 INTERCHANGEABLE
Glass,sheet
4720-00-990-168526521 INTERCHANGEABLE
Hose,preformed
Gates Corporation
5935-01-029-643326521 INTERCHANGEABLE
Connector,receptacle,electrical
Hubbell Incorporated (delaware) Dba Wiring Device-Kellems Division
5340-01-364-633112925-00 INTERCHANGEABLE
Cap,protective,dust and Moisture
Trimble Military and Advanced Systems, Inc. Dba Trimble Navigation
4920-01-463-5420734308-1 INTERCHANGEABLE
Fixture Assembly,holding,interfa
Drs Sustainment Systems Inc
Cross-Reference Index
Part NumberManufacturer
1292500 Keystone Brass and Rubber Co (USA)
A975S Sterling Div Federal Mogul Corp (USA)
7343081 U S Army Tank Automotive Command Amsta-Im-Mm (USA)
26521 PRIMARY Briggs and Stratton Corp (USA)
Related Parts
5330-00-084-1230INTERCHANGEABLE
GASKET
2652-1
2915-00-370-9078INTERCHANGEABLE
FUEL FLOAT VALVE ASSEMBLY
2-652-1
5930-00-448-0001INTERCHANGEABLE
SWITCH,MAGNET
815-1853067SYM2652-1
2915-00-580-9408INTERCHANGEABLE
VALVE,FLOAT,AIRCRAFT FUEL TANK
9-253-51
6615-00-786-7081INTERCHANGEABLE
NUT,SYNCHRO,LOCK
26521
5620-00-982-8182INTERCHANGEABLE
GLASS,SHEET
4720-00-990-1685INTERCHANGEABLE
HOSE,PREFORMED
26521
5935-01-029-6433INTERCHANGEABLE
CONNECTOR,RECEPTACLE,ELECTRICAL
26521
5340-01-364-6331INTERCHANGEABLE
CAP,PROTECTIVE,DUST AND MOISTURE
12925-00
4920-01-463-5420INTERCHANGEABLE
FIXTURE ASSEMBLY,HOLDING,INTERFA
734308-1

Frequently Asked Questions

What is NSN 2805-00-351-6344?

NSN 2805-00-351-6344 is a Valve,poppet,engine, manufactured by Briggs and Stratton Corp, classified under FSC 2805 (No Item Name Available). Status: cancelled.

What are the part numbers for NSN 2805-00-351-6344?

NSN 2805-00-351-6344 has 4 cross-referenced part numbers: 1292500 (Keystone Brass and Rubber Co), A975S (Sterling Div Federal Mogul Corp), 7343081 (U S Army Tank Automotive Command Amsta-Im-Mm), 26521 (Briggs and Stratton Corp).

What NSN replaces 2805-00-351-6344?

There are 10 known substitutes for 2805-00-351-6344: 5330-00-084-1230, 2915-00-370-9078, 5930-00-448-0001 and 7 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 26521?

Key specifications for 26521: Stem Length: 3.7969 INCHES NOMINAL IN; Stem Diameter: 0.3100 INCHES NOMINAL IN; Groove Diameter: 0.2500 INCHES NOMINAL IN; Seat Angle in Deg: 45.0. 19 total characteristics are documented in the Federal Logistics Information System.

Is NSN 2805-00-351-6344 still in active supply?

NSN 2805-00-351-6344 is currently cancelled. Check with the Defense Logistics Agency for current availability and authorized substitutes.

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