PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

56559Spring,helical,torsion

Kleinschmidt Inc · NSN 5360-00-543-2421 · FSC 5360 · No Item Name Available
Verified by PartsTable
NSN 5360-00-543-2421 — this item is cataloged by the U.S. Government under National Stock Number 5360-00-543-2421. Primary manufacturer part number: 56559.
Features
  • Spring,helical,torsion — FSC 5360
  • Style Designator: SINGLE TORSION LEFT HAND
  • End Style: STRAIGHT BEND END (RIGHT) FIRST END
  • Spring Free Outside Diameter: 0.321 INCHES NOMINAL IN
  • Hook Radius: 0.105 INCHES NOMINAL OVERALL IN
  • Coil Quantity: G
  • Surface Treatment: TIN OVERALL
  • End Angular Relationship: ENDS ANGLED ONE TO OTHER
Applications
  • Mechanical energy storage
  • Vibration dampening
  • Return mechanism operation
  • Applications requiring Steel Overall construction
General Description

The Spring,helical,torsion, cataloged under National Stock Number 5360-00-543-2421, is classified within Federal Supply Class 5360 (No Item Name Available) of the Hardware and Abrasives group. The primary manufacturer of record is Kleinschmidt Inc. Government technical data includes 15 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. 2 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Cancelled.

Technical Specifications
ParameterValue
NSN5360-00-543-2421
Primary Part Number56559
Item NameSpring,helical,torsion
FSC / FSG5360 / 53 — No Item Name Available
ManufacturerKleinschmidt Inc
StatusCANCELLED
Style DesignatorSINGLE TORSION LEFT HAND
End StyleSTRAIGHT BEND END (RIGHT) FIRST END
Spring Free Outside Diameter0.321 INCHES NOMINAL IN
Hook Radius0.105 INCHES NOMINAL OVERALL IN
Coil QuantityG
Surface TreatmentTIN OVERALL
End Angular RelationshipENDS ANGLED ONE TO OTHER
Inside Diameter0.281 INCHES NOMINAL IN
MaterialSTEEL OVERALL
Spring Free Length0.203 INCHES NOMINAL IN
End Length From First Bend to Second Bend or End0.250 INCHES NOMINAL OVERALL IN
Coil Helix DirectionLEFT-HAND
End StyleOFFSET HALF LOOP, LEFT END SECOND END
End Length From Second Bend to Third Bend or End0.109 INCHES NOMINAL OVERALL IN
End Length From Coil Axis to First Bend0.250 INCHES NOMINAL OVERALL IN
Lifecycle & Compliance
Acquisition StatusCANCELLED
HAZMATNo
Verified Substitutes 2
3120-00-293-450956559 INTERCHANGEABLE
Bearing,sleeve
Honeywell International Inc. Dba Honeywell International Div Aerospace - Tempe (west Warner Road)
5330-00-601-820812295 INTERCHANGEABLE
Seal
Clayton Manufacturing Company
Cross-Reference Index
Part NumberManufacturer
56559 Kleinschmidt Inc (USA)
Related Parts
3120-00-293-4509INTERCHANGEABLE
BEARING,SLEEVE
56559
5330-00-601-8208INTERCHANGEABLE
SEAL
12295

Frequently Asked Questions

What is NSN 5360-00-543-2421?

NSN 5360-00-543-2421 is a Spring,helical,torsion, manufactured by Kleinschmidt Inc, classified under FSC 5360 (No Item Name Available). Status: cancelled.

What are the part numbers for NSN 5360-00-543-2421?

NSN 5360-00-543-2421 has 1 cross-referenced part number: 56559 (Kleinschmidt Inc).

What NSN replaces 5360-00-543-2421?

There are 2 known substitutes for 5360-00-543-2421: 3120-00-293-4509, 5330-00-601-8208. Verify interchangeability with system specifications before substitution.

What are the specifications of 56559?

Key specifications for 56559: Style Designator: SINGLE TORSION LEFT HAND; End Style: STRAIGHT BEND END (RIGHT) FIRST END; Spring Free Outside Diameter: 0.321 INCHES NOMINAL IN; Hook Radius: 0.105 INCHES NOMINAL OVERALL IN. 15 total characteristics are documented in the Federal Logistics Information System.

Is NSN 5360-00-543-2421 still in active supply?

NSN 5360-00-543-2421 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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