PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

8690-6 IN ITEM 8Seat,valve

William E Williams Valve Corp · NSN 4820-01-264-0678 · FSC 4820 · No Item Name Available
Verified by PartsTable
NSN 4820-01-264-0678 — this item is cataloged by the U.S. Government under National Stock Number 4820-01-264-0678. Primary manufacturer part number: 8690-6 IN ITEM 8.
Features
  • Seat,valve — FSC 4820
  • Material: STEEL CORROSION RESISTING OVERALL
  • 2 verified cross-references
  • Primary manufacturer: William E Williams Valve Corp
Applications
  • Flow control in piping systems
  • Pressure regulation
  • Steam and fluid isolation
  • Applications requiring Steel Corrosion Resisting Overall construction
General Description

The Seat,valve, cataloged under National Stock Number 4820-01-264-0678, 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. Government technical data includes 1 verified specification, sourced from the Federal Logistics Information System (FLIS). This item has 2 commercial cross-references from 1 manufacturer, enabling identification through both NSN and commercial part number lookups. 12 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN4820-01-264-0678
Primary Part Number8690-6 IN ITEM 8
Item NameSeat,valve
FSC / FSG4820 / 48 — No Item Name Available
ManufacturerWilliam E Williams Valve Corp
StatusACTIVE
MaterialSTEEL CORROSION RESISTING OVERALL
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 12
5950-00-235-7095 INTERCHANGEABLE
Reactor
6640-00-290-684229-1200-09 INTERCHANGEABLE
Dish,evaporating
J & H Berge, Inc. Dba Lab Mart, the Div the Labmart
6640-00-290-6843 INTERCHANGEABLE
Dish,evaporating
6640-00-290-6846 INTERCHANGEABLE
Dish,evaporating
5930-00-470-0300 INTERCHANGEABLE
Switch,electrical
5360-00-738-07088690 INTERCHANGEABLE
Spring,helical,compression
Circor Aerospace, Inc. Div Circor
5120-00-966-8243220606 INTERCHANGEABLE
Nozzle,caulking Gun
Prc - Desoto International, Inc. Dba Prc-Desoto International, Inc Div Asc-Indianapolis
4930-00-975-95418690 INTERCHANGEABLE
Oiler,hand
Gc/waldom Inc
6685-00-987-3834 INTERCHANGEABLE
Tester,pyrometer and Thermocoupl
4820-01-263-95568690-6 ITEM 2 INTERCHANGEABLE
Disk,valve
William E Williams Valve Corp
Cross-Reference Index
Part NumberManufacturer
8690-6 IN ITEM 8 PRIMARY William E Williams Valve Corp (USA)
8690 William E Williams Valve Corp (USA)
Related Parts
5950-00-235-7095INTERCHANGEABLE
REACTOR
6640-00-290-6842INTERCHANGEABLE
DISH,EVAPORATING
29-1200-09
6640-00-290-6843INTERCHANGEABLE
DISH,EVAPORATING
6640-00-290-6846INTERCHANGEABLE
DISH,EVAPORATING
5930-00-470-0300INTERCHANGEABLE
SWITCH,ELECTRICAL
5360-00-738-0708INTERCHANGEABLE
SPRING,HELICAL,COMPRESSION
8690
5120-00-966-8243INTERCHANGEABLE
NOZZLE,CAULKING GUN
220606
4930-00-975-9541INTERCHANGEABLE
OILER,HAND
8690
6685-00-987-3834INTERCHANGEABLE
TESTER,PYROMETER AND THERMOCOUPL
4820-01-263-9556INTERCHANGEABLE
DISK,VALVE
8690-6 ITEM 2
4820-01-273-1410INTERCHANGEABLE
DISK,VALVE
8690-5 IN ITEM 2
3040-01-309-4149INTERCHANGEABLE
PISTON,LINEAR ACTUATING CYLINDER
8-690

Frequently Asked Questions

What is NSN 4820-01-264-0678?

NSN 4820-01-264-0678 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 4820-01-264-0678?

NSN 4820-01-264-0678 has 2 cross-referenced part numbers: 8690-6 IN ITEM 8 (William E Williams Valve Corp), 8690 (William E Williams Valve Corp).

What NSN replaces 4820-01-264-0678?

There are 12 known substitutes for 4820-01-264-0678: 5950-00-235-7095, 6640-00-290-6842, 6640-00-290-6843 and 9 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 8690-6 IN ITEM 8?

Key specifications for 8690-6 IN ITEM 8: Material: STEEL CORROSION RESISTING OVERALL. 1 total characteristics are documented in the Federal Logistics Information System.

Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com