PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

18878Bearing,washer,thrust

Altra Industrial Motion Corp. · NSN 3120-01-021-1923 · FSC 3120 · No Item Name Available
Verified by PartsTable
NSN 3120-01-021-1923 — this item is cataloged by the U.S. Government under National Stock Number 3120-01-021-1923. Primary manufacturer part number: 18878.
Features
  • Bearing,washer,thrust — FSC 3120
  • Diameter: 1.0000 INCHES NOMINAL IN
  • Style Designator: ROUND
  • Surface Condition: GROUND
  • Corner Shape: SQUARE ALL CORNERS
  • Outside Diameter: 1.5625 INCHES NOMINAL IN
  • Material: STEEL OVERALL
  • Cross-Sectional Shape Style: RECTANGULAR
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 3120-01-021-1923, 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 1 commercial cross-reference from 1 manufacturer, 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
NSN3120-01-021-1923
Primary Part Number18878
Item NameBearing,washer,thrust
FSC / FSG3120 / 31 — No Item Name Available
ManufacturerAltra Industrial Motion Corp.
StatusACTIVE
Diameter1.0000 INCHES NOMINAL IN
Style DesignatorROUND
Surface ConditionGROUND
Corner ShapeSQUARE ALL CORNERS
Outside Diameter1.5625 INCHES NOMINAL IN
MaterialSTEEL OVERALL
Cross-Sectional Shape StyleRECTANGULAR
Overall Thickness0.1825 INCHES MINIMUM AND 0.1875 INCHES MAXIMUM IN
Center Hole Shape StyleROUND
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 2
4820-01-303-1113UBE-24169 INTERCHANGEABLE
Valve,safety Relief
Dla Land and Maritime Dba Engineering and Technical Support Div Document Standardization Division (vendor Item Drawings)
6530-01-588-8456330521 INTERCHANGEABLE
Leg Assembly,surgical Sink
Aseptico, Inc. Dba Aseptico Inc
Cross-Reference Index
Part NumberManufacturer
18878 PRIMARY Altra Industrial Motion Corp. (USA)
Related Parts
4820-01-303-1113INTERCHANGEABLE
VALVE,SAFETY RELIEF
UBE-24169
6530-01-588-8456INTERCHANGEABLE
LEG ASSEMBLY,SURGICAL SINK
330521

Frequently Asked Questions

What is NSN 3120-01-021-1923?

NSN 3120-01-021-1923 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 3120-01-021-1923?

NSN 3120-01-021-1923 has 1 cross-referenced part number: 18878 (Altra Industrial Motion Corp.).

What NSN replaces 3120-01-021-1923?

There are 2 known substitutes for 3120-01-021-1923: 4820-01-303-1113, 6530-01-588-8456. Verify interchangeability with system specifications before substitution.

What are the specifications of 18878?

Key specifications for 18878: Diameter: 1.0000 INCHES NOMINAL IN; Style Designator: ROUND; Surface Condition: GROUND; Corner Shape: SQUARE ALL CORNERS. 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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