PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

23521Standoff,threaded,spacing

Hamilton Sundstrand Corporation Dba Collins Aerospace · NSN 5340-00-854-0188 · FSC 5340 · No Item Name Available
Verified by PartsTable
NSN 5340-00-854-0188 — this item is cataloged by the U.S. Government under National Stock Number 5340-00-854-0188. Primary manufacturer part number: 23521.
Features
  • Standoff,threaded,spacing — FSC 5340
  • Diameter: 0.375 INCHES NOMINAL IN
  • Style Designator: LEFT INTERNAL AND RIGHT EXTERNAL THREAD
  • Cross-Sectional Shape: ROUND
  • Length: 2.990 INCHES NOMINAL IN
  • 2 verified cross-references
  • Primary manufacturer: Hamilton Sundstrand Corporation Dba Collins Aerospace
Applications
  • General assembly and fastening
  • Structural repair and reinforcement
  • Facility maintenance hardware
General Description

The Standoff,threaded,spacing, cataloged under National Stock Number 5340-00-854-0188, is classified within Federal Supply Class 5340 (No Item Name Available) of the Hardware and Abrasives group. The primary manufacturer of record is Hamilton Sundstrand Corporation Dba Collins Aerospace. Government technical data includes 4 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 2 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. Unit of issue: EA.

Technical Specifications
ParameterValue
NSN5340-00-854-0188
Primary Part Number23521
Item NameStandoff,threaded,spacing
FSC / FSG5340 / 53 — No Item Name Available
ManufacturerHamilton Sundstrand Corporation Dba Collins Aerospace
StatusACTIVE
Diameter0.375 INCHES NOMINAL IN
Style DesignatorLEFT INTERNAL AND RIGHT EXTERNAL THREAD
Cross-Sectional ShapeROUND
Length2.990 INCHES NOMINAL IN
Lifecycle & Compliance
Acquisition StatusACTIVE
Successor6130-01-442-4090 (23521)
HAZMATNo
Unit of IssueEA
Verified Substitutes 12
6130-01-442-409023521 SUCCESSOR
Battery Power Supply
Trimble Military and Advanced Systems, Inc. Dba Trimble Navigation
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.
5950-00-648-540323521 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.
3010-00-824-268423521 INTERCHANGEABLE
Coupling,shaft,flexible
Senior Operations Llc Dba Metal Bellows Div Metal Bellows
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
23521 PRIMARY Hamilton Sundstrand Corporation Dba Collins Aerospace (USA)
23521 United Technologies Corp Hamilton Sundstrand Corp (USA)
Related Parts
SUCCESSOR 6130-01-442-4090 Battery Power Supply · 23521
5999-00-035-7893INTERCHANGEABLE
CONTACT,ELECTRICAL
23-521
2810-00-118-9025INTERCHANGEABLE
PISTON,INTERNAL COMBUSTION ENGIN
23521
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
3010-00-824-2684INTERCHANGEABLE
COUPLING,SHAFT,FLEXIBLE
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
4820-01-553-0468INTERCHANGEABLE
VALVE,SAFETY RELIEF
23521

Frequently Asked Questions

What is NSN 5340-00-854-0188?

NSN 5340-00-854-0188 is a Standoff,threaded,spacing, manufactured by Hamilton Sundstrand Corporation Dba Collins Aerospace, classified under FSC 5340 (No Item Name Available). Status: active.

What are the part numbers for NSN 5340-00-854-0188?

NSN 5340-00-854-0188 has 2 cross-referenced part numbers: 23521 (Hamilton Sundstrand Corporation Dba Collins Aerospace), 23521 (United Technologies Corp Hamilton Sundstrand Corp).

What NSN replaces 5340-00-854-0188?

There are 12 known substitutes for 5340-00-854-0188: 6130-01-442-4090, 5999-00-035-7893, 2810-00-118-9025 and 9 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 23521?

Key specifications for 23521: Diameter: 0.375 INCHES NOMINAL IN; Style Designator: LEFT INTERNAL AND RIGHT EXTERNAL THREAD; Special Features: 4-40 UNC-2B THD TAPPED INSIDE OF EXTERNAL THD; Cross-Sectional Shape: ROUND. 5 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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