PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

23521Coupling,shaft,flexible

Senior Operations Llc Dba Metal Bellows Div Metal Bellows · NSN 3010-00-824-2684 · FSC 3010 · No Item Name Available
Verified by PartsTable
NSN 3010-00-824-2684 — this item is cataloged by the U.S. Government under National Stock Number 3010-00-824-2684. Primary manufacturer part number: 23521.
Features
  • Coupling,shaft,flexible — FSC 3010
  • Thread Size Designator: NO.4-40 BOTH ENDS
  • Bore Length: 0.2810 INCHES NOMINAL BOTH ENDS IN
  • Bellows Material: STEEL
  • Bore Diameter: 0.1880 INCHES NOMINAL BOTH ENDS IN
  • Nondefinitive Spec/std Data: 1 TYPE AND A STYLE
  • Outside Diameter: 0.500 INCHES NOMINAL IN
  • Furnished Items and Quantity: SETSCREW
Applications
  • Industrial maintenance and repair
  • Government and military logistics
  • Equipment overhaul and refurbishment
General Description

The Coupling,shaft,flexible, cataloged under National Stock Number 3010-00-824-2684, is classified within Federal Supply Class 3010 (No Item Name Available) of the Mechanical Power Transmission Equipment group. The primary manufacturer of record is Senior Operations Llc Dba Metal Bellows Div Metal Bellows. Government technical data includes 12 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 5 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.

Technical Specifications
ParameterValue
NSN3010-00-824-2684
Primary Part Number23521
Item NameCoupling,shaft,flexible
FSC / FSG3010 / 30 — No Item Name Available
ManufacturerSenior Operations Llc Dba Metal Bellows Div Metal Bellows
StatusACTIVE
Thread Size DesignatorNO.4-40 BOTH ENDS
Bore Length0.2810 INCHES NOMINAL BOTH ENDS IN
Bellows MaterialSTEEL
Bore Diameter0.1880 INCHES NOMINAL BOTH ENDS IN
Nondefinitive Spec/std Data1 TYPE AND A STYLE
Outside Diameter0.500 INCHES NOMINAL IN
Furnished Items and QuantitySETSCREW
Design TypeBELLOWS
Securing MethodTHREADED HOLE(S) BOTH ENDS
Threaded Hole Quantity2 BOTH ENDS
Threaded Hole LocationBOTH ENDS: LOCATED ON PERIPHERY OF HUB
Bore ShapeSTRAIGHT BOTH ENDS
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 12
5999-00-035-789323-521 INTERCHANGEABLE
Contact,electrical
Eaton Corp Opns & Technical Center
2810-00-118-902523521 INTERCHANGEABLE
Piston,internal Combustion Engin
Pratt & Whitney Canada Corp Div Pratt & Whitney Canada Corp.
5950-00-552-0826L291834-1 INTERCHANGEABLE
Transformer,power
Raytheon Company Dba Raytheon Co
5950-00-648-540323521 INTERCHANGEABLE
Transformer,power
L3harris Technologies, Inc Div Space & Airborne Systems
5985-00-723-4628MX-1554A/U INTERCHANGEABLE
Seal,radio Frequency Transmissio
Joint Electronics Type Designation System
5940-00-784-304910-910-2 INTERCHANGEABLE
Terminal,stud
Concord Electronics, Inc.
5340-00-854-018823521 INTERCHANGEABLE
Standoff,threaded,spacing
Hamilton Sundstrand Corporation Dba Collins Aerospace
5950-01-072-994612282754 INTERCHANGEABLE
Transformer,power
U S Army Tank Automotive Command Amsta-Im-Mm
5998-01-220-2243 INTERCHANGEABLE
Circuit Card Assembly
5950-01-348-9868 INTERCHANGEABLE
Transformer,power
Cross-Reference Index
Part NumberManufacturer
B-23521 Senior Operations Llc Dba Metal Bellows Div Metal Bellows (USA)
W2S4 Senior Operations Llc Dba Metal Bellows Div Metal Bellows (USA)
B2351 Senior Operations Llc Dba Metal Bellows Div Metal Bellows (USA)
580R097H02 Northrop Grumman Systems Corporation Dba Northrop Grumman Systems Corp (USA)
23521 PRIMARY Senior Operations Llc Dba Metal Bellows Div Metal Bellows (USA)
Related Parts
5999-00-035-7893INTERCHANGEABLE
CONTACT,ELECTRICAL
23-521
2810-00-118-9025INTERCHANGEABLE
PISTON,INTERNAL COMBUSTION ENGIN
23521
5950-00-552-0826INTERCHANGEABLE
TRANSFORMER,POWER
L291834-1
5950-00-648-5403INTERCHANGEABLE
TRANSFORMER,POWER
23521
5985-00-723-4628INTERCHANGEABLE
SEAL,RADIO FREQUENCY TRANSMISSIO
MX-1554A/U
5940-00-784-3049INTERCHANGEABLE
TERMINAL,STUD
10-910-2
5340-00-854-0188INTERCHANGEABLE
STANDOFF,THREADED,SPACING
23521
5950-01-072-9946INTERCHANGEABLE
TRANSFORMER,POWER
12282754
5998-01-220-2243INTERCHANGEABLE
CIRCUIT CARD ASSEMBLY
5950-01-348-9868INTERCHANGEABLE
TRANSFORMER,POWER
5310-01-382-5020INTERCHANGEABLE
NUT,PLAIN,HEXAGON
23521
6130-01-442-4090INTERCHANGEABLE
BATTERY POWER SUPPLY
23521

Frequently Asked Questions

What is NSN 3010-00-824-2684?

NSN 3010-00-824-2684 is a Coupling,shaft,flexible, manufactured by Senior Operations Llc Dba Metal Bellows Div Metal Bellows, classified under FSC 3010 (No Item Name Available). Status: active.

What are the part numbers for NSN 3010-00-824-2684?

NSN 3010-00-824-2684 has 5 cross-referenced part numbers: B-23521 (Senior Operations Llc Dba Metal Bellows Div Metal Bellows), W2S4 (Senior Operations Llc Dba Metal Bellows Div Metal Bellows), B2351 (Senior Operations Llc Dba Metal Bellows Div Metal Bellows), 580R097H02 (Northrop Grumman Systems Corporation Dba Northrop Grumman Systems Corp), 23521 (Senior Operations Llc Dba Metal Bellows Div Metal Bellows).

What NSN replaces 3010-00-824-2684?

There are 12 known substitutes for 3010-00-824-2684: 5999-00-035-7893, 2810-00-118-9025, 5950-00-552-0826 and 9 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 23521?

Key specifications for 23521: Thread Size Designator: NO.4-40 BOTH ENDS; Bore Length: 0.2810 INCHES NOMINAL BOTH ENDS IN; Bellows Material: STEEL; Overall Length: 0.810 INCHES NOMINAL IN. 13 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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