PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

521791Spring,helical,compression

Westinghouse Air Brake Technologies Corp Dba Westinghouse Air Brake Technologies Corp · NSN 5360-00-291-5020 · FSC 5360 · No Item Name Available
Verified by PartsTable
NSN 5360-00-291-5020 — this item is cataloged by the U.S. Government under National Stock Number 5360-00-291-5020. Primary manufacturer part number: 521791.
Features
  • Spring,helical,compression — FSC 5360
  • Style Designator: CYLINDRICAL
  • Spring Free Length: 0.953 INCHES NOMINAL IN
  • Coil Helix Direction: LEFT-HAND
  • Inside Diameter: 0.109 INCHES NOMINAL IN
  • Material: STEEL OVERALL
  • Spring Free Outside Diameter: 0.375 INCHES NOMINAL IN
  • Surface Treatment: PHOSPHATE OVERALL
Applications
  • Mechanical energy storage
  • Vibration dampening
  • Return mechanism operation
  • Applications requiring Steel Overall construction
General Description

The Spring,helical,compression, cataloged under National Stock Number 5360-00-291-5020, is classified within Federal Supply Class 5360 (No Item Name Available) of the Hardware and Abrasives group. The primary manufacturer of record is Westinghouse Air Brake Technologies Corp Dba Westinghouse Air Brake Technologies Corp. Government technical data includes 8 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 5 commercial cross-references from 1 manufacturer, enabling identification through both NSN and commercial part number lookups. 3 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN5360-00-291-5020
Primary Part Number521791
Item NameSpring,helical,compression
FSC / FSG5360 / 53 — No Item Name Available
ManufacturerWestinghouse Air Brake Technologies Corp Dba Westinghouse Air Brake Technologies Corp
StatusACTIVE
Style DesignatorCYLINDRICAL
Spring Free Length0.953 INCHES NOMINAL IN
Coil Helix DirectionLEFT-HAND
Inside Diameter0.109 INCHES NOMINAL IN
MaterialSTEEL OVERALL
Spring Free Outside Diameter0.375 INCHES NOMINAL IN
Surface TreatmentPHOSPHATE OVERALL
End StyleSPRING END,SQUARED AND GROUND BOTH ENDS
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 3
3040-00-122-6472 INTERCHANGEABLE
Belt Drive Assemb
5940-01-014-9830MS21004-10 INTERCHANGEABLE
Terminal,lug
Sae International Dba Sae International
6625-01-343-7021 INTERCHANGEABLE
Voltmeter
Cross-Reference Index
Part NumberManufacturer
Y1015B3PC9 Westinghouse Air Brake Technologies Corp Dba Westinghouse Air Brake Technologies Corp (USA)
Y1015A1PC9 Westinghouse Air Brake Technologies Corp Dba Westinghouse Air Brake Technologies Corp (USA)
Y1015B2PC9 Westinghouse Air Brake Technologies Corp Dba Westinghouse Air Brake Technologies Corp (USA)
Y1015B1PC9 Westinghouse Air Brake Technologies Corp Dba Westinghouse Air Brake Technologies Corp (USA)
521791 PRIMARY Westinghouse Air Brake Technologies Corp Dba Westinghouse Air Brake Technologies Corp (USA)
Related Parts
3040-00-122-6472INTERCHANGEABLE
BELT DRIVE ASSEMB
5940-01-014-9830INTERCHANGEABLE
TERMINAL,LUG
MS21004-10
6625-01-343-7021INTERCHANGEABLE
VOLTMETER

Frequently Asked Questions

What is NSN 5360-00-291-5020?

NSN 5360-00-291-5020 is a Spring,helical,compression, manufactured by Westinghouse Air Brake Technologies Corp Dba Westinghouse Air Brake Technologies Corp, classified under FSC 5360 (No Item Name Available). Status: active.

What are the part numbers for NSN 5360-00-291-5020?

NSN 5360-00-291-5020 has 5 cross-referenced part numbers: Y1015B3PC9 (Westinghouse Air Brake Technologies Corp Dba Westinghouse Air Brake Technologies Corp), Y1015A1PC9 (Westinghouse Air Brake Technologies Corp Dba Westinghouse Air Brake Technologies Corp), Y1015B2PC9 (Westinghouse Air Brake Technologies Corp Dba Westinghouse Air Brake Technologies Corp), Y1015B1PC9 (Westinghouse Air Brake Technologies Corp Dba Westinghouse Air Brake Technologies Corp), 521791 (Westinghouse Air Brake Technologies Corp Dba Westinghouse Air Brake Technologies Corp).

What NSN replaces 5360-00-291-5020?

There are 3 known substitutes for 5360-00-291-5020: 3040-00-122-6472, 5940-01-014-9830, 6625-01-343-7021. Verify interchangeability with system specifications before substitution.

What are the specifications of 521791?

Key specifications for 521791: Style Designator: CYLINDRICAL; Spring Free Length: 0.953 INCHES NOMINAL IN; Coil Helix Direction: LEFT-HAND; Inside Diameter: 0.109 INCHES NOMINAL IN. 8 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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