PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

8343 ITEM 8Seat,valve

William E Williams Valve Corp · NSN 4820-01-247-7812 · FSC 4820 · No Item Name Available
Verified by PartsTable
NSN 4820-01-247-7812 — this item is cataloged by the U.S. Government under National Stock Number 4820-01-247-7812. Primary manufacturer part number: 8343 ITEM 8.
Features
  • Seat,valve — FSC 4820
  • 2 verified cross-references
  • Primary manufacturer: William E Williams Valve Corp
Applications
  • Flow control in piping systems
  • Pressure regulation
  • Steam and fluid isolation
General Description

The Seat,valve, cataloged under National Stock Number 4820-01-247-7812, is classified within Federal Supply Class 4820 (No Item Name Available) of the Valves group. The primary manufacturer of record is William E Williams Valve Corp. This item has 2 commercial cross-references from 1 manufacturer, enabling identification through both NSN and commercial part number lookups. 4 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Catalog Facts
Item NameSeat,valve
FSC / FSG4820 — No Item Name Available (FSG 48)
ManufacturersWilliam E Williams Valve Corp (CAGE 79342)
Technical Specifications
ParameterValue
NSN4820-01-247-7812
Primary Part Number8343 ITEM 8
Item NameSeat,valve
FSC / FSG4820 / 48 — No Item Name Available
ManufacturerWilliam E Williams Valve Corp
StatusACTIVE
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 4
5330-00-106-198183438 INTERCHANGEABLE
Packing,preformed
Woods T B Inc
4820-00-158-122024A4146 INTERCHANGEABLE
Valve,linear,directional Control
Crane Carrier Company, Llc
3110-00-653-157883438 INTERCHANGEABLE
Bearing,roller,needle
Eaton Aerospace, Llc Dba Jackson South
3990-01-366-40058343-8 INTERCHANGEABLE
Roller,material Handling
Rtx Corp
Cross-Reference Index
Part NumberManufacturer
8343-8 William E Williams Valve Corp (USA)
8343 ITEM 8 PRIMARY William E Williams Valve Corp (USA)
Related Parts
5330-00-106-1981INTERCHANGEABLE
PACKING,PREFORMED
83438
4820-00-158-1220INTERCHANGEABLE
VALVE,LINEAR,DIRECTIONAL CONTROL
24A4146
3110-00-653-1578INTERCHANGEABLE
BEARING,ROLLER,NEEDLE
83438
3990-01-366-4005INTERCHANGEABLE
ROLLER,MATERIAL HANDLING
8343-8

Frequently Asked Questions

What is NSN 4820-01-247-7812?

NSN 4820-01-247-7812 is a Seat,valve, manufactured by William E Williams Valve Corp, classified under FSC 4820 (No Item Name Available). Status: active.

What are the part numbers for NSN 4820-01-247-7812?

NSN 4820-01-247-7812 has 2 cross-referenced part numbers: 8343-8 (William E Williams Valve Corp), 8343 ITEM 8 (William E Williams Valve Corp).

What NSN replaces 4820-01-247-7812?

There are 4 known substitutes for 4820-01-247-7812: 5330-00-106-1981, 4820-00-158-1220, 3110-00-653-1578 and 1 more. Verify interchangeability with system specifications before substitution.

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