PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

21545Standoff,threaded,spacing

Aerosonic Llc · NSN 5340-00-964-2556 · FSC 5340 · No Item Name Available
Verified by PartsTable
NSN 5340-00-964-2556 — this item is cataloged by the U.S. Government under National Stock Number 5340-00-964-2556. Primary manufacturer part number: 21545.
Features
  • Standoff,threaded,spacing — FSC 5340
  • Width Across Flats: 0.188 INCHES NOMINAL IN
  • Cross-Sectional Shape: HEXAGON
  • Style Designator: LEFT INTERNAL AND RIGHT EXTERNAL THREAD
  • Length: 0.835 INCHES NOMINAL IN
  • 1 verified cross-reference
  • Primary manufacturer: Aerosonic Llc
Applications
  • General assembly and fastening
  • Structural repair and reinforcement
  • Facility maintenance hardware
General Description

The Standoff,threaded,spacing, cataloged under National Stock Number 5340-00-964-2556, is classified within Federal Supply Class 5340 (No Item Name Available) of the Hardware and Abrasives group. The primary manufacturer of record is Aerosonic Llc. Government technical data includes 4 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. 7 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active. Unit of issue: EA.

Technical Specifications
ParameterValue
NSN5340-00-964-2556
Primary Part Number21545
Item NameStandoff,threaded,spacing
FSC / FSG5340 / 53 — No Item Name Available
ManufacturerAerosonic Llc
StatusACTIVE
Width Across Flats0.188 INCHES NOMINAL IN
Cross-Sectional ShapeHEXAGON
Style DesignatorLEFT INTERNAL AND RIGHT EXTERNAL THREAD
Length0.835 INCHES NOMINAL IN
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Unit of IssueEA
Verified Substitutes 7
5330-00-290-517421545 INTERCHANGEABLE
Packing,preformed
Eaton Aerospace, Llc Dba Jackson South
5945-00-628-64848151703-0002 INTERCHANGEABLE
Relay,hybrid
Air Force Lifecycle Management Center Electronic Components (aflcmc/ezss)
5998-01-074-2510 INTERCHANGEABLE
Circuit Card Assembly
5998-01-095-812621545 INTERCHANGEABLE
Printed Wiring Board
Smiths Aerospace, Inc., Electronic Systems-Grand Rapids
5331-01-140-7194 INTERCHANGEABLE
O-Ring
5330-01-246-254621545 INTERCHANGEABLE
Gasket
Industrial Technologies and Services Llc
5935-01-607-843521545 INTERCHANGEABLE
Socket Assembly,plug-in Electron
Vicor Corp Dba Vicorpowercom
Cross-Reference Index
Part NumberManufacturer
21545 PRIMARY Aerosonic Llc (USA)
Related Parts
5330-00-290-5174INTERCHANGEABLE
PACKING,PREFORMED
21545
5945-00-628-6484INTERCHANGEABLE
RELAY,HYBRID
8151703-0002
5998-01-074-2510INTERCHANGEABLE
CIRCUIT CARD ASSEMBLY
5998-01-095-8126INTERCHANGEABLE
PRINTED WIRING BOARD
21545
5331-01-140-7194INTERCHANGEABLE
O-RING
5330-01-246-2546INTERCHANGEABLE
GASKET
21545
5935-01-607-8435INTERCHANGEABLE
SOCKET ASSEMBLY,PLUG-IN ELECTRON
21545

Frequently Asked Questions

What is NSN 5340-00-964-2556?

NSN 5340-00-964-2556 is a Standoff,threaded,spacing, manufactured by Aerosonic Llc, classified under FSC 5340 (No Item Name Available). Status: active.

What are the part numbers for NSN 5340-00-964-2556?

NSN 5340-00-964-2556 has 1 cross-referenced part number: 21545 (Aerosonic Llc).

What NSN replaces 5340-00-964-2556?

There are 7 known substitutes for 5340-00-964-2556: 5330-00-290-5174, 5945-00-628-6484, 5998-01-074-2510 and 4 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 21545?

Key specifications for 21545: Width Across Flats: 0.188 INCHES NOMINAL IN; Cross-Sectional Shape: HEXAGON; Style Designator: LEFT INTERNAL AND RIGHT EXTERNAL THREAD; Length: 0.835 INCHES NOMINAL IN. 4 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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