PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

721-8541924-8Washer,flat

Naval Sea Systems Command · NSN 5310-01-684-8803 · FSC 5310 · No Item Name Available
Verified by PartsTable
NSN 5310-01-684-8803 — this item is cataloged by the U.S. Government under National Stock Number 5310-01-684-8803. Primary manufacturer part number: 721-8541924-8.
Features
  • Washer,flat — FSC 5310
  • 3 verified cross-references
  • Primary manufacturer: Naval Sea Systems Command
Applications
  • Structural fastening and assembly
  • Equipment mounting
  • Panel and housing attachment
General Description

The Washer,flat, cataloged under National Stock Number 5310-01-684-8803, is classified within Federal Supply Class 5310 (No Item Name Available) of the Hardware and Abrasives group. The primary manufacturer of record is Naval Sea Systems Command. This item has 3 commercial cross-references from 2 manufacturers, enabling identification through both NSN and commercial part number lookups. 12 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Catalog Facts
Item NameWasher,flat
FSC / FSG5310 — No Item Name Available (FSG 53)
ManufacturersElectric Boat Corporation Div General Dynamics Electric Boat (CAGE 96169); Naval Sea Systems Command (CAGE 53711)
Technical Specifications
ParameterValue
NSN5310-01-684-8803
Primary Part Number721-8541924-8
Item NameWasher,flat
FSC / FSG5310 / 53 — No Item Name Available
ManufacturerNaval Sea Systems Command
StatusACTIVE
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 12
5330-01-684-7256721-8541924-29 INTERCHANGEABLE
Seal,plain
Naval Sea Systems Command
5305-01-684-7340721-8541924-5 INTERCHANGEABLE
Screw,machine
Naval Sea Systems Command
5305-01-684-8628721-8541924-57 INTERCHANGEABLE
Setscrew
Naval Sea Systems Command
5305-01-684-8740721-8541924-40 INTERCHANGEABLE
Setscrew
Naval Sea Systems Command
5330-01-684-9988721-8541924-34 INTERCHANGEABLE
Seal,plain
Naval Sea Systems Command
4820-01-685-0036721-8541924-52 INTERCHANGEABLE
Valve,plug
Naval Sea Systems Command
3040-01-685-1664721-8541924-9 INTERCHANGEABLE
Rod,piston,linear Actuating Cyli
Naval Sea Systems Command
5315-01-685-1718721-8541924-53 INTERCHANGEABLE
Pin,straight,headless
Naval Sea Systems Command
3040-01-685-1738721-8541924-2 INTERCHANGEABLE
Piston,linear Actuating Cylinder
Naval Sea Systems Command
5360-01-685-1880721-8541924-14 INTERCHANGEABLE
Spring,helical,compression
Naval Sea Systems Command
Cross-Reference Index
Part NumberManufacturer
R8611506-8 Electric Boat Corporation Div General Dynamics Electric Boat (USA)
721-8541924 Naval Sea Systems Command (USA)
721-8541924-8 PRIMARY Naval Sea Systems Command (USA)
Related Parts
5330-01-684-7256INTERCHANGEABLE
SEAL,PLAIN
721-8541924-29
5305-01-684-7340INTERCHANGEABLE
SCREW,MACHINE
721-8541924-5
5305-01-684-8628INTERCHANGEABLE
SETSCREW
721-8541924-57
5305-01-684-8740INTERCHANGEABLE
SETSCREW
721-8541924-40
5330-01-684-9988INTERCHANGEABLE
SEAL,PLAIN
721-8541924-34
4820-01-685-0036INTERCHANGEABLE
VALVE,PLUG
721-8541924-52
3040-01-685-1664INTERCHANGEABLE
ROD,PISTON,LINEAR ACTUATING CYLI
721-8541924-9
5315-01-685-1718INTERCHANGEABLE
PIN,STRAIGHT,HEADLESS
721-8541924-53
3040-01-685-1738INTERCHANGEABLE
PISTON,LINEAR ACTUATING CYLINDER
721-8541924-2
5360-01-685-1880INTERCHANGEABLE
SPRING,HELICAL,COMPRESSION
721-8541924-14
5330-01-685-5228INTERCHANGEABLE
RETAINER,PACKING
AS5781P09-112
5330-01-685-6848INTERCHANGEABLE
RING,WIPER
SH959-41

Frequently Asked Questions

What is NSN 5310-01-684-8803?

NSN 5310-01-684-8803 is a Washer,flat, manufactured by Naval Sea Systems Command, classified under FSC 5310 (No Item Name Available). Status: active.

What are the part numbers for NSN 5310-01-684-8803?

NSN 5310-01-684-8803 has 3 cross-referenced part numbers: R8611506-8 (Electric Boat Corporation Div General Dynamics Electric Boat), 721-8541924 (Naval Sea Systems Command), 721-8541924-8 (Naval Sea Systems Command).

What NSN replaces 5310-01-684-8803?

There are 12 known substitutes for 5310-01-684-8803: 5330-01-684-7256, 5305-01-684-7340, 5305-01-684-8628 and 9 more. Verify interchangeability with system specifications before substitution.

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