PartsTable TECHNICAL DATA SHEET
AUGUST 2026Technical Data Sheet

AA19821-8PC19821-55Diaphragm,valve,flat

Hunt Valve Company, Inc. · NSN 4820-00-326-6003 · FSC 4820 · No Item Name Available
Verified by PartsTable
NSN 4820-00-326-6003 — this item is cataloged by the U.S. Government under National Stock Number 4820-00-326-6003. Primary manufacturer part number: AA19821-8PC19821-55.
Features
  • Diaphragm,valve,flat — FSC 4820
  • Center Hole Diameter: 0.772 INCHES NOMINAL IN
  • Outside Diameter: 3.750 INCHES NOMINAL IN
  • Material: STEEL CORROSION RESISTING
  • Style Designator: FLAT
  • Material Thickness: 0.024 INCHES NOMINAL IN
  • 50 verified cross-references
  • Primary manufacturer: Hunt Valve Company, Inc.
Applications
  • Flow control in piping systems
  • Pressure regulation
  • Steam and fluid isolation
  • Applications requiring Steel Corrosion Resisting construction
General Description

The Diaphragm,valve,flat, cataloged under National Stock Number 4820-00-326-6003, is classified within Federal Supply Class 4820 (No Item Name Available) of the Valves group. The primary manufacturer of record is Hunt Valve Company, Inc.. Government technical data includes 5 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 50 commercial cross-references from 2 manufacturers, enabling identification through both NSN and commercial part number lookups. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN4820-00-326-6003
Primary Part NumberAA19821-8PC19821-55
Item NameDiaphragm,valve,flat
FSC / FSG4820 / 48 — No Item Name Available
ManufacturerHunt Valve Company, Inc.
StatusACTIVE
Center Hole Diameter0.772 INCHES NOMINAL IN
Outside Diameter3.750 INCHES NOMINAL IN
MaterialSTEEL CORROSION RESISTING
Style DesignatorFLAT
Material Thickness0.024 INCHES NOMINAL IN
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Cross-Reference Index
Part NumberManufacturer
AA19821-8PC19821-55 PRIMARY Hunt Valve Company, Inc. (USA)
AA19821-3PC19821-54 PRIMARY Hunt Valve Company, Inc. (USA)
AA21041PC19821-54 Hunt Valve Company Inc Dba Union Flonetics (USA)
D18271QC Hunt Valve Company Inc Dba Union Flonetics (USA)
AA23178PC23178-54 PRIMARY Hunt Valve Company, Inc. (USA)
AA20045PC20044-55 PRIMARY Hunt Valve Company, Inc. (USA)
AA22055PC22052-55 Hunt Valve Company Inc Dba Union Flonetics (USA)
AA19821PC19821-4 Hunt Valve Company Inc Dba Union Flonetics (USA)
AA21041-1PC19821-54 Hunt Valve Company Inc Dba Union Flonetics (USA)
AA23148PC23148-55 PRIMARY Hunt Valve Company, Inc. (USA)
AA23019PC23017-55 Hunt Valve Company Inc Dba Union Flonetics (USA)
AA20044PC20044-54 Hunt Valve Company Inc Dba Union Flonetics (USA)
AA23148PC23148-55 Hunt Valve Company Inc Dba Union Flonetics (USA)
AA23178PC178-55 Hunt Valve Company Inc Dba Union Flonetics (USA)
AA23742PC23742-55 PRIMARY Hunt Valve Company, Inc. (USA)
AA23742PC23742-54 Hunt Valve Company Inc Dba Union Flonetics (USA)
AA19819-1PC54 PRIMARY Hunt Valve Company, Inc. (USA)
AA23017PC23017-54 PRIMARY Hunt Valve Company, Inc. (USA)
AA22055PC22052-54 PRIMARY Hunt Valve Company, Inc. (USA)
AA22052-1PC22052-54 PRIMARY Hunt Valve Company, Inc. (USA)
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Frequently Asked Questions

What is NSN 4820-00-326-6003?

NSN 4820-00-326-6003 is a Diaphragm,valve,flat, manufactured by Hunt Valve Company, Inc., classified under FSC 4820 (No Item Name Available). Status: active.

What are the part numbers for NSN 4820-00-326-6003?

NSN 4820-00-326-6003 has 50 cross-referenced part numbers: AA19821-8PC19821-55 (Hunt Valve Company, Inc.), AA19821-3PC19821-54 (Hunt Valve Company, Inc.), AA21041PC19821-54 (Hunt Valve Company Inc Dba Union Flonetics), D18271QC (Hunt Valve Company Inc Dba Union Flonetics), AA23178PC23178-54 (Hunt Valve Company, Inc.) and 45 more.

What are the specifications of AA19821-8PC19821-55?

Key specifications for AA19821-8PC19821-55: Center Hole Diameter: 0.772 INCHES NOMINAL IN; Outside Diameter: 3.750 INCHES NOMINAL IN; Material: STEEL CORROSION RESISTING; Style Designator: FLAT. 5 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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