PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

18866Bearing,washer,thrust

Altra Industrial Motion Corp. · NSN 3120-00-689-3149 · FSC 3120 · No Item Name Available
Verified by PartsTable
NSN 3120-00-689-3149 — this item is cataloged by the U.S. Government under National Stock Number 3120-00-689-3149. Primary manufacturer part number: 18866.
Features
  • Bearing,washer,thrust — FSC 3120
  • Surface Condition: GROUND
  • Corner Shape: SQUARE ALL CORNERS
  • Style Designator: ROUND
  • Material: STEEL OVERALL
  • Cross-Sectional Shape Style: RECTANGULAR
  • Outside Diameter: 2.0000 INCHES NOMINAL IN
  • Diameter: 0.7500 INCHES NOMINAL IN
Applications
  • Rotating machinery support and alignment
  • Shaft load distribution
  • Precision spindle assemblies
  • Structural fastening and assembly
  • Equipment mounting
General Description

The Bearing,washer,thrust, cataloged under National Stock Number 3120-00-689-3149, is classified within Federal Supply Class 3120 (No Item Name Available) of the Bearings group. The primary manufacturer of record is Altra Industrial Motion Corp.. Government technical data includes 9 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. 2 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN3120-00-689-3149
Primary Part Number18866
Item NameBearing,washer,thrust
FSC / FSG3120 / 31 — No Item Name Available
ManufacturerAltra Industrial Motion Corp.
StatusACTIVE
Surface ConditionGROUND
Corner ShapeSQUARE ALL CORNERS
Style DesignatorROUND
MaterialSTEEL OVERALL
Cross-Sectional Shape StyleRECTANGULAR
Outside Diameter2.0000 INCHES NOMINAL IN
Diameter0.7500 INCHES NOMINAL IN
Overall Thickness0.1875 INCHES NOMINAL IN
Center Hole Shape StyleROUND
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 2
5950-00-647-517506224 INTERCHANGEABLE
Transformer,power
L3harris Technologies, Inc. Div Space and Airborne Systems
6680-01-507-2448 INTERCHANGEABLE
Speed Sensor,turbine Engine
Cross-Reference Index
Part NumberManufacturer
18866 PRIMARY Altra Industrial Motion Corp. (USA)
6-1-4004-4-133 W1d1 Natick Soldier Center Dba Us Army Ccdc Soldier Center Div Combat Capabilities Development Command - Soldier Center (USA)
Related Parts
5950-00-647-5175INTERCHANGEABLE
TRANSFORMER,POWER
06224
6680-01-507-2448INTERCHANGEABLE
SPEED SENSOR,TURBINE ENGINE

Frequently Asked Questions

What is NSN 3120-00-689-3149?

NSN 3120-00-689-3149 is a Bearing,washer,thrust, manufactured by Altra Industrial Motion Corp., classified under FSC 3120 (No Item Name Available). Status: active.

What are the part numbers for NSN 3120-00-689-3149?

NSN 3120-00-689-3149 has 2 cross-referenced part numbers: 18866 (Altra Industrial Motion Corp.), 6-1-4004-4-133 (W1d1 Natick Soldier Center Dba Us Army Ccdc Soldier Center Div Combat Capabilities Development Command - Soldier Center).

What NSN replaces 3120-00-689-3149?

There are 2 known substitutes for 3120-00-689-3149: 5950-00-647-5175, 6680-01-507-2448. Verify interchangeability with system specifications before substitution.

What are the specifications of 18866?

Key specifications for 18866: Surface Condition: GROUND; Corner Shape: SQUARE ALL CORNERS; Style Designator: ROUND; Material: STEEL OVERALL. 9 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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