PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

20521Clip,spring Tension

Kleinschmidt Inc · NSN 5340-00-559-8763 · FSC 5340 · No Item Name Available
Verified by PartsTable
NSN 5340-00-559-8763 — this item is cataloged by the U.S. Government under National Stock Number 5340-00-559-8763. Primary manufacturer part number: 20521.
Features
  • Clip,spring Tension — FSC 5340
  • Material Thickness: 0.020 INCHES NOMINAL IN
  • Hole Diameter: 0.178 INCHES NOMINAL IN
  • Material: STEEL OVERALL
  • Distance From End to Hole Nearest Loop: 0.250 INCHES NOMINAL IN
  • Width: 0.375 INCHES NOMINAL IN
  • Length: 1.000 INCHES NOMINAL IN
  • Distance From Base to Lip: 0.020 INCHES NOMINAL IN
Applications
  • Mechanical energy storage
  • Vibration dampening
  • Return mechanism operation
  • Applications requiring Steel Overall construction
General Description

The Clip,spring Tension, cataloged under National Stock Number 5340-00-559-8763, is classified within Federal Supply Class 5340 (No Item Name Available) of the Hardware and Abrasives group. The primary manufacturer of record is Kleinschmidt Inc. Government technical data includes 9 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. 7 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Cancelled. Unit of issue: EA.

Technical Specifications
ParameterValue
NSN5340-00-559-8763
Primary Part Number20521
Item NameClip,spring Tension
FSC / FSG5340 / 53 — No Item Name Available
ManufacturerKleinschmidt Inc
StatusCANCELLED
Material Thickness0.020 INCHES NOMINAL IN
Hole Diameter0.178 INCHES NOMINAL IN
MaterialSTEEL OVERALL
Distance From End to Hole Nearest Loop0.250 INCHES NOMINAL IN
Width0.375 INCHES NOMINAL IN
Length1.000 INCHES NOMINAL IN
Distance From Base to Lip0.020 INCHES NOMINAL IN
Surface TreatmentPHOSPHATE OVERALL
Features ProvidedCUSHION
Lifecycle & Compliance
Acquisition StatusCANCELLED
Successor5340-01-124-4585 (20521)
HAZMATNo
Unit of IssueEA
Verified Substitutes 7
No Item Name Available
5340-01-124-458520521 SUCCESSOR
Seat,helical Compression Spring
Eaton Corporation Dba Airframe Div Fuel & Motion Control Systems
4730-00-277-53095710S1-8 INTERCHANGEABLE
Plug,pipe
The Walworth Company
5945-00-883-683713217E4066-1 INTERCHANGEABLE
Relay,electromagnetic
Cecom Lr Center
5331-01-171-631020521 INTERCHANGEABLE
O-Ring
Electro Impulse Laboratory Inc Dba Electro Impulse Inc
4710-01-176-089120714 INTERCHANGEABLE
Tube,metallic
Alcoa/reynolds Metals Company
5310-01-391-2749 INTERCHANGEABLE
Nut,self-Locking,hexagon
Cross-Reference Index
Part NumberManufacturer
20521 Kleinschmidt Inc (USA)
C3234-020-16 Tinnerman Palnut Engineered Products, Inc. (USA)
Related Parts
SUCCESSOR 5340-01-124-4585 Seat,helical Compression Spring · 20521
5340-00-579-6503SUCCESSOR
NO ITEM NAME AVAILABLE
4730-00-277-5309INTERCHANGEABLE
PLUG,PIPE
5710S1-8
5945-00-883-6837INTERCHANGEABLE
RELAY,ELECTROMAGNETIC
13217E4066-1
5331-01-171-6310INTERCHANGEABLE
O-RING
20521
4710-01-176-0891INTERCHANGEABLE
TUBE,METALLIC
20714
5310-01-391-2749INTERCHANGEABLE
NUT,SELF-LOCKING,HEXAGON

Frequently Asked Questions

What is NSN 5340-00-559-8763?

NSN 5340-00-559-8763 is a Clip,spring Tension, manufactured by Kleinschmidt Inc, classified under FSC 5340 (No Item Name Available). Status: cancelled.

What are the part numbers for NSN 5340-00-559-8763?

NSN 5340-00-559-8763 has 2 cross-referenced part numbers: 20521 (Kleinschmidt Inc), C3234-020-16 (Tinnerman Palnut Engineered Products, Inc.).

What NSN replaces 5340-00-559-8763?

There are 7 known substitutes for 5340-00-559-8763: 5340-00-579-6503, 5340-01-124-4585, 4730-00-277-5309 and 4 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 20521?

Key specifications for 20521: Material Thickness: 0.020 INCHES NOMINAL IN; Hole Diameter: 0.178 INCHES NOMINAL IN; Material: STEEL OVERALL; Distance From End to Hole Nearest Loop: 0.250 INCHES NOMINAL IN. 10 total characteristics are documented in the Federal Logistics Information System.

Is NSN 5340-00-559-8763 still in active supply?

NSN 5340-00-559-8763 is currently cancelled. Check with the Defense Logistics Agency for current availability and authorized substitutes.

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