PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

1645Seat,valve

Velan Valve Corp. · NSN 4820-00-064-7241 · FSC 4820 · No Item Name Available
Verified by PartsTable
NSN 4820-00-064-7241 — this item is cataloged by the U.S. Government under National Stock Number 4820-00-064-7241. Primary manufacturer part number: 1645.
Features
  • Seat,valve — FSC 4820
  • Seating Surface Shape: ANGULAR
  • Thread Length: 0.560 INCHES NOMINAL SINGLE THREADED PORTION IN
  • Body Inside Diameter: 0.456 INCHES NOMINAL IN
  • Thread Class: 2A SINGLE THREADED PORTION A
  • Thread Series Designator: UNF SINGLE THREADED PORTION
  • Material: STEEL OVERALL
  • Style Designator: PLAIN THREADED
Applications
  • Flow control in piping systems
  • Pressure regulation
  • Steam and fluid isolation
  • Applications requiring Steel Overall construction
General Description

The Seat,valve, cataloged under National Stock Number 4820-00-064-7241, is classified within Federal Supply Class 4820 (No Item Name Available) of the Valves group. The primary manufacturer of record is Velan Valve Corp.. Government technical data includes 9 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 1 commercial cross-reference 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
NSN4820-00-064-7241
Primary Part Number1645
Item NameSeat,valve
FSC / FSG4820 / 48 — No Item Name Available
ManufacturerVelan Valve Corp.
StatusACTIVE
Seating Surface ShapeANGULAR
Thread Length0.560 INCHES NOMINAL SINGLE THREADED PORTION IN
Body Inside Diameter0.456 INCHES NOMINAL IN
Thread Class2A SINGLE THREADED PORTION A
Thread Series DesignatorUNF SINGLE THREADED PORTION
MaterialSTEEL OVERALL
Style DesignatorPLAIN THREADED
Seat Angle in Deg33.000 NOMINAL
Nominal Thread Size1.125 INCHES SINGLE THREADED PORTION IN
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 12
5961-00-189-65141645 INTERCHANGEABLE
Semiconductor Device,photo
L3 Technologies, Inc. Div Communication Systems-East
2920-00-379-01461645 INTERCHANGEABLE
Base,regulator Shie
H20 Tank Inc U S Motors Div
6680-00-399-26621645 INTERCHANGEABLE
Cone,airline
King Engineering Corporation Dba King-Gage Systems
5305-00-474-37511645 INTERCHANGEABLE
Setscrew
Triumph Engine Control Systems Llc
6625-00-520-5282 INTERCHANGEABLE
Slotted Line,coaxial
4730-00-544-2345 INTERCHANGEABLE
Lubricator,drive St
5935-00-910-9194 INTERCHANGEABLE
Adapter,connector
5950-00-952-84061783709-45 INTERCHANGEABLE
Transformer,audio Frequency
Honeywell International Inc. Dba Honeywell International
4530-01-022-95962.25X80DEGMTDR INTERCHANGEABLE
Nozzle,oil Burner,pressure Atomi
Monarch Mfg Works Inc
5340-01-042-3246 INTERCHANGEABLE
Handle,bow
Cross-Reference Index
Part NumberManufacturer
1645 PRIMARY Velan Valve Corp. (USA)
Related Parts
5961-00-189-6514INTERCHANGEABLE
SEMICONDUCTOR DEVICE,PHOTO
1645
2920-00-379-0146INTERCHANGEABLE
BASE,REGULATOR SHIE
1645
6680-00-399-2662INTERCHANGEABLE
CONE,AIRLINE
1645
5305-00-474-3751INTERCHANGEABLE
SETSCREW
1645
6625-00-520-5282INTERCHANGEABLE
SLOTTED LINE,COAXIAL
4730-00-544-2345INTERCHANGEABLE
LUBRICATOR,DRIVE ST
5935-00-910-9194INTERCHANGEABLE
ADAPTER,CONNECTOR
5950-00-952-8406INTERCHANGEABLE
TRANSFORMER,AUDIO FREQUENCY
1783709-45
4530-01-022-9596INTERCHANGEABLE
NOZZLE,OIL BURNER,PRESSURE ATOMI
2.25X80DEGMTDR
5340-01-042-3246INTERCHANGEABLE
HANDLE,BOW
5355-01-045-5324INTERCHANGEABLE
KNOB
KNS-701BA
5307-01-163-1970INTERCHANGEABLE
STUD,PLAIN
1645

Frequently Asked Questions

What is NSN 4820-00-064-7241?

NSN 4820-00-064-7241 is a Seat,valve, manufactured by Velan Valve Corp., classified under FSC 4820 (No Item Name Available). Status: active.

What are the part numbers for NSN 4820-00-064-7241?

NSN 4820-00-064-7241 has 1 cross-referenced part number: 1645 (Velan Valve Corp.).

What NSN replaces 4820-00-064-7241?

There are 12 known substitutes for 4820-00-064-7241: 5961-00-189-6514, 2920-00-379-0146, 6680-00-399-2662 and 9 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 1645?

Key specifications for 1645: Overall Height: 0.440 INCHES NOMINAL IN; Seating Surface Shape: ANGULAR; Thread Length: 0.560 INCHES NOMINAL SINGLE THREADED PORTION IN; Body Inside Diameter: 0.456 INCHES NOMINAL IN. 10 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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