PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

6661-2Spring Assembly,fir

Meggitt Safety Systems Inc · NSN 1680-01-155-6739 · FSC 1680 · No Item Name Available
Verified by PartsTable
NSN 1680-01-155-6739 — this item is cataloged by the U.S. Government under National Stock Number 1680-01-155-6739. Primary manufacturer part number: 6661-2.
Features
  • Spring Assembly,fir — FSC 1680
  • 1 verified cross-reference
  • Primary manufacturer: Meggitt Safety Systems Inc
Applications
  • Mechanical energy storage
  • Vibration dampening
  • Return mechanism operation
General Description

The Spring Assembly,fir, cataloged under National Stock Number 1680-01-155-6739, is classified within Federal Supply Class 1680 (No Item Name Available) of the Aircraft Components and Accessories group. The primary manufacturer of record is Meggitt Safety Systems Inc. This item has 1 commercial cross-reference 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.

Catalog Facts
Item NameSpring Assembly,fir
FSC / FSG1680 — No Item Name Available (FSG 16)
ManufacturersMeggitt Safety Systems Inc (CAGE 25693)
Technical Specifications
ParameterValue
NSN1680-01-155-6739
Primary Part Number6661-2
Item NameSpring Assembly,fir
FSC / FSG1680 / 16 — No Item Name Available
ManufacturerMeggitt Safety Systems Inc
StatusACTIVE
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 3
4720-00-973-5484666-12 INTERCHANGEABLE
Hose,nonmetallic
Eaton Aeroquip Llc Dba Jackson North 1 Div Fluid and Electrical Distribution
5210-01-023-0334599-9642-120 INTERCHANGEABLE
Gage Stock,thickness
Brown & Sharpe, Inc. Div Precision Measuring Instruments, Tesa Usa
7021-01-588-9488RMC6121A-1 INTERCHANGEABLE
Computer,digital
Acnodes Corporation Dba Acnodes Corp
Cross-Reference Index
Part NumberManufacturer
6661-2 PRIMARY Meggitt Safety Systems Inc (USA)
Related Parts
4720-00-973-5484INTERCHANGEABLE
HOSE,NONMETALLIC
666-12
5210-01-023-0334INTERCHANGEABLE
GAGE STOCK,THICKNESS
599-9642-120
7021-01-588-9488INTERCHANGEABLE
COMPUTER,DIGITAL
RMC6121A-1

Frequently Asked Questions

What is NSN 1680-01-155-6739?

NSN 1680-01-155-6739 is a Spring Assembly,fir, manufactured by Meggitt Safety Systems Inc, classified under FSC 1680 (No Item Name Available). Status: active.

What are the part numbers for NSN 1680-01-155-6739?

NSN 1680-01-155-6739 has 1 cross-referenced part number: 6661-2 (Meggitt Safety Systems Inc).

What NSN replaces 1680-01-155-6739?

There are 3 known substitutes for 1680-01-155-6739: 4720-00-973-5484, 5210-01-023-0334, 7021-01-588-9488. Verify interchangeability with system specifications before substitution.

Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com