PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

A1611Spring,helical,extension

Kelly Manufacturing Company · NSN 5360-00-124-9031 · FSC 5360 · No Item Name Available
Verified by PartsTable
NSN 5360-00-124-9031 — this item is cataloged by the U.S. Government under National Stock Number 5360-00-124-9031. Primary manufacturer part number: A1611.
Features
  • Spring,helical,extension — FSC 5360
  • Inside Diameter: 0.125 INCHES NOMINAL IN
  • Material Document and Classification: QQ-W-470 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
  • Material: STEEL UNS K08500 OVERALL
  • Coil Quantity: 10
  • Spring Length Under Load: 0.562 INCHES NOMINAL IN
  • Load Rating: 0.150 KILOGRAMS NOMINAL KG
  • Coil to Hook Inside Length: 0.136 INCHES NOMINAL BOTH ENDS IN
Applications
  • Mechanical energy storage
  • Vibration dampening
  • Return mechanism operation
  • Applications requiring Steel Uns K08500 Overall construction
General Description

The Spring,helical,extension, cataloged under National Stock Number 5360-00-124-9031, is classified within Federal Supply Class 5360 (No Item Name Available) of the Hardware and Abrasives group. The primary manufacturer of record is Kelly Manufacturing Company. Government technical data includes 15 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. 4 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN5360-00-124-9031
Primary Part NumberA1611
Item NameSpring,helical,extension
FSC / FSG5360 / 53 — No Item Name Available
ManufacturerKelly Manufacturing Company
StatusACTIVE
Inside Diameter0.125 INCHES NOMINAL IN
Material Document and ClassificationQQ-W-470 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
MaterialSTEEL UNS K08500 OVERALL
Coil Quantity10
Spring Length Under Load0.562 INCHES NOMINAL IN
Load Rating0.150 KILOGRAMS NOMINAL KG
Coil to Hook Inside Length0.136 INCHES NOMINAL BOTH ENDS IN
Spring Free Length0.468 INCHES NOMINAL IN
Coil Helix DirectionLEFT-HAND
Design TypeCLOSED
End StyleFULL LOOP BOTH ENDS
Hook Radius0.068 INCHES NOMINAL BOTH ENDS IN
Spring Deflection Rate1.752 POUNDS PER INCH NOMINAL LBS
Spring Free Outside Diameter0.145 INCHES NOMINAL IN
Style DesignatorCYLINDRICAL
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 4
5310-00-222-72052F9864 INTERCHANGEABLE
Nut,plain,hexagon
Caterpillar Inc Div Caterpillar Defense
5330-00-599-5360 INTERCHANGEABLE
Gasket
8455-01-528-9541 INTERCHANGEABLE
Insignia,shoulder Sleeve
8455-01-659-8439 INTERCHANGEABLE
Insignia,shoulder Sleeve
Cross-Reference Index
Part NumberManufacturer
A1611 PRIMARY Kelly Manufacturing Company (USA)
A1611 Allen R C Instruments Inc (USA)
Related Parts
5310-00-222-7205INTERCHANGEABLE
NUT,PLAIN,HEXAGON
2F9864
5330-00-599-5360INTERCHANGEABLE
GASKET
8455-01-528-9541INTERCHANGEABLE
INSIGNIA,SHOULDER SLEEVE
8455-01-659-8439INTERCHANGEABLE
INSIGNIA,SHOULDER SLEEVE

Frequently Asked Questions

What is NSN 5360-00-124-9031?

NSN 5360-00-124-9031 is a Spring,helical,extension, manufactured by Kelly Manufacturing Company, classified under FSC 5360 (No Item Name Available). Status: active.

What are the part numbers for NSN 5360-00-124-9031?

NSN 5360-00-124-9031 has 2 cross-referenced part numbers: A1611 (Kelly Manufacturing Company), A1611 (Allen R C Instruments Inc).

What NSN replaces 5360-00-124-9031?

There are 4 known substitutes for 5360-00-124-9031: 5310-00-222-7205, 5330-00-599-5360, 8455-01-528-9541 and 1 more. Verify interchangeability with system specifications before substitution.

What are the specifications of A1611?

Key specifications for A1611: Inside Diameter: 0.125 INCHES NOMINAL IN; Material Document and Classification: QQ-W-470 FED SPEC SINGLE MATERIAL RESPONSE OVERALL; Material: STEEL UNS K08500 OVERALL; Coil Quantity: 10. 15 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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