PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

87643-7504 ITEM 9Drum,valve

Electric Boat Corporation Div General Dynamics Electric Boat · NSN 4820-01-121-2898 · FSC 4820 · No Item Name Available
Verified by PartsTable
NSN 4820-01-121-2898 — this item is cataloged by the U.S. Government under National Stock Number 4820-01-121-2898. Primary manufacturer part number: 87643-7504 ITEM 9.
Features
  • Drum,valve — FSC 4820
  • General Characteristics Item Description: 14.250 IN.OD; 13.750 IN.BC; 5.500 IN.LG IN
  • 4 verified cross-references
  • Primary manufacturer: Electric Boat Corporation Div General Dynamics Electric Boat
Applications
  • Flow control in piping systems
  • Pressure regulation
  • Steam and fluid isolation
General Description

The Drum,valve, cataloged under National Stock Number 4820-01-121-2898, is classified within Federal Supply Class 4820 (No Item Name Available) of the Valves group. The primary manufacturer of record is Electric Boat Corporation Div General Dynamics Electric Boat. Government technical data includes 1 verified specification, sourced from the Federal Logistics Information System (FLIS). This item has 4 commercial cross-references from 3 manufacturers, 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
NSN4820-01-121-2898
Primary Part Number87643-7504 ITEM 9
Item NameDrum,valve
FSC / FSG4820 / 48 — No Item Name Available
ManufacturerElectric Boat Corporation Div General Dynamics Electric Boat
StatusACTIVE
General Characteristics Item Description14.250 IN.OD; 13.750 IN.BC; 5.500 IN.LG IN
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 12
3020-01-096-2021501-4675698 ITEM 14 INTERCHANGEABLE
Plate,drive,gear,lock
Naval Ship Systems Command
4820-01-103-0157501-4675698 ITEM 8 INTERCHANGEABLE
Plate,stop,valve
Naval Ship Systems Command
4820-01-103-0158501-4675698 ITEM 13 INTERCHANGEABLE
Rod Retainer,valve
Naval Ship Systems Command
4820-01-103-3325501-4675698 ITEM 35 INTERCHANGEABLE
Shield,dust
Bright Lights Usa, Inc Dba Blusa Defense Manufacturing
4820-01-121-19094675698-0020 INTERCHANGEABLE
Shroud,valve
Electric Boat Corporation Div General Dynamics Electric Boat
3040-01-121-199387643-7504 ITEM 12 INTERCHANGEABLE
Connecting Link,rigid
Electric Boat Corporation Div General Dynamics Electric Boat
3020-01-123-3107501-4675698 ITEM 15 INTERCHANGEABLE
Stop,gear
Naval Ship Systems Command
4820-01-130-5559501-4675698 ITEM 16 INTERCHANGEABLE
Rod,vent Valve
Naval Ship Systems Command
3020-01-149-7908501-4675698 ITEM 5-6-7 INTERCHANGEABLE
Gear Set
Naval Ship Systems Command
3020-01-257-1559501-4675698 ITEM 54 INTERCHANGEABLE
Gear,drive,vent Valve
Naval Ship Systems Command
Cross-Reference Index
Part NumberManufacturer
87643-7504 Electric Boat Corporation Div General Dynamics Electric Boat (USA)
87643-7504 ITEM 9 PRIMARY Electric Boat Corporation Div General Dynamics Electric Boat (USA)
501-4675698 ITEM 9 Naval Sea Systems Command (USA)
501-4675698 Naval Ship Systems Command (USA)
Related Parts
3020-01-096-2021INTERCHANGEABLE
PLATE,DRIVE,GEAR,LOCK
501-4675698 ITEM 14
4820-01-103-0157INTERCHANGEABLE
PLATE,STOP,VALVE
501-4675698 ITEM 8
4820-01-103-0158INTERCHANGEABLE
ROD RETAINER,VALVE
501-4675698 ITEM 13
4820-01-103-3325INTERCHANGEABLE
SHIELD,DUST
501-4675698 ITEM 35
4820-01-121-1909INTERCHANGEABLE
SHROUD,VALVE
4675698-0020
3040-01-121-1993INTERCHANGEABLE
CONNECTING LINK,RIGID
87643-7504 ITEM 12
3020-01-123-3107INTERCHANGEABLE
STOP,GEAR
501-4675698 ITEM 15
4820-01-130-5559INTERCHANGEABLE
ROD,VENT VALVE
501-4675698 ITEM 16
3020-01-149-7908INTERCHANGEABLE
GEAR SET
501-4675698 ITEM 5-6-7
3020-01-257-1559INTERCHANGEABLE
GEAR,DRIVE,VENT VALVE
501-4675698 ITEM 54
5365-01-257-1560INTERCHANGEABLE
BUSHING,VENT VALVE
501-4675698 ITEM 52
3040-01-264-8419INTERCHANGEABLE
SHAFT,STRAIGHT
501-4675698 ITEM 55

Frequently Asked Questions

What is NSN 4820-01-121-2898?

NSN 4820-01-121-2898 is a Drum,valve, manufactured by Electric Boat Corporation Div General Dynamics Electric Boat, classified under FSC 4820 (No Item Name Available). Status: active.

What are the part numbers for NSN 4820-01-121-2898?

NSN 4820-01-121-2898 has 4 cross-referenced part numbers: 87643-7504 (Electric Boat Corporation Div General Dynamics Electric Boat), 87643-7504 ITEM 9 (Electric Boat Corporation Div General Dynamics Electric Boat), 501-4675698 ITEM 9 (Naval Sea Systems Command), 501-4675698 (Naval Ship Systems Command).

What NSN replaces 4820-01-121-2898?

There are 12 known substitutes for 4820-01-121-2898: 3020-01-096-2021, 4820-01-103-0157, 4820-01-103-0158 and 9 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 87643-7504 ITEM 9?

Key specifications for 87643-7504 ITEM 9: General Characteristics Item Description: 14.250 IN.OD; 13.750 IN.BC; 5.500 IN.LG IN. 1 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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