PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

8521Gearbox Assembly,aircraft

Cef Industries, Llc Dba Cef Industries Inc · NSN 1680-01-257-2445 · FSC 1680 · No Item Name Available
Verified by PartsTable
NSN 1680-01-257-2445 — this item is cataloged by the U.S. Government under National Stock Number 1680-01-257-2445. Primary manufacturer part number: 8521.
Features
  • Gearbox Assembly,aircraft — FSC 1680
  • 2 verified cross-references
  • Primary manufacturer: Cef Industries, Llc Dba Cef Industries Inc
Applications
  • Industrial maintenance and repair
  • Government and military logistics
  • Equipment overhaul and refurbishment
General Description

The Gearbox Assembly,aircraft, cataloged under National Stock Number 1680-01-257-2445, is classified within Federal Supply Class 1680 (No Item Name Available) of the Aircraft Components and Accessories group. The primary manufacturer of record is Cef Industries, Llc Dba Cef Industries Inc. 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.

Technical Specifications
ParameterValue
NSN1680-01-257-2445
Primary Part Number8521
Item NameGearbox Assembly,aircraft
FSC / FSG1680 / 16 — No Item Name Available
ManufacturerCef Industries, Llc Dba Cef Industries Inc
StatusCANCELLED
Lifecycle & Compliance
Acquisition StatusCANCELLED
HAZMATNo
Verified Substitutes 7
5360-00-321-27408521 INTERCHANGEABLE
Spring,helical,compression
Cummins Inc.
1075-00-383-82663134722B INTERCHANGEABLE
Eccentric
Naval Ship Systems Command
4730-00-408-7900830-012 INTERCHANGEABLE
Coupling,pipe
Nibco Inc Chemtrol Div
5365-00-448-47298521 INTERCHANGEABLE
Spacer,sleeve
Halsit Holdings Llc Div Halsit Holdings, Llc Dba Abbatron
5340-00-598-8648 INTERCHANGEABLE
Strap,retaining
5975-00-878-48738521 INTERCHANGEABLE
Box Connector,electrical
Abb Installation Products Inc
8115-01-303-4524 INTERCHANGEABLE
Box,shipping
Cross-Reference Index
Part NumberManufacturer
8521 PRIMARY Cef Industries, Llc Dba Cef Industries Inc (USA)
1680PL0720417 Jednolity Indeks Materialowy - Uniform Material Index (POL)
Related Parts
5360-00-321-2740INTERCHANGEABLE
SPRING,HELICAL,COMPRESSION
8521
1075-00-383-8266INTERCHANGEABLE
ECCENTRIC
3134722B
4730-00-408-7900INTERCHANGEABLE
COUPLING,PIPE
830-012
5365-00-448-4729INTERCHANGEABLE
SPACER,SLEEVE
8521
5340-00-598-8648INTERCHANGEABLE
STRAP,RETAINING
5975-00-878-4873INTERCHANGEABLE
BOX CONNECTOR,ELECTRICAL
8521
8115-01-303-4524INTERCHANGEABLE
BOX,SHIPPING

Frequently Asked Questions

What is NSN 1680-01-257-2445?

NSN 1680-01-257-2445 is a Gearbox Assembly,aircraft, manufactured by Cef Industries, Llc Dba Cef Industries Inc, classified under FSC 1680 (No Item Name Available). Status: cancelled.

What are the part numbers for NSN 1680-01-257-2445?

NSN 1680-01-257-2445 has 2 cross-referenced part numbers: 8521 (Cef Industries, Llc Dba Cef Industries Inc), 1680PL0720417 (Jednolity Indeks Materialowy - Uniform Material Index).

What NSN replaces 1680-01-257-2445?

There are 7 known substitutes for 1680-01-257-2445: 5360-00-321-2740, 1075-00-383-8266, 4730-00-408-7900 and 4 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 8521?

Key specifications for 8521: End Item Identification: AIRCRAFT C130. 1 total characteristics are documented in the Federal Logistics Information System.

Is NSN 1680-01-257-2445 still in active supply?

NSN 1680-01-257-2445 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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