PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

BLN4003GCMILG3278Bearing,plain,self-Aligning

Rbc Southwest Products, Inc. · NSN 3120-00-661-7138 · FSC 3120 · No Item Name Available
Verified by PartsTable
NSN 3120-00-661-7138 — this item is cataloged by the U.S. Government under National Stock Number 3120-00-661-7138. Primary manufacturer part number: BLN4003GCMILG3278.
Features
  • Bearing,plain,self-Aligning — FSC 3120
  • Bore Diameter: 0.2495 INCHES MINIMUM AND 0.2500 INCHES MAXIMUM IN
  • Material: COPPER ALLOY OUTER RACE MEMBER
  • Style Designator: WITHOUT INSERT OR LINER
  • Surface Treatment: CADMIUM OUTER RACE MEMBER
  • Lubrication Feature: GROOVE EXTERNAL OUTER MEMBER
  • Material: STEEL INNER MEMBER
  • Outer Member Width: 0.2450 INCHES NOMINAL IN
Applications
  • Rotating machinery support and alignment
  • Shaft load distribution
  • Precision spindle assemblies
  • Applications requiring Copper Alloy Outer Race Member construction
General Description

The Bearing,plain,self-Aligning, cataloged under National Stock Number 3120-00-661-7138, is classified within Federal Supply Class 3120 (No Item Name Available) of the Bearings group. The primary manufacturer of record is Rbc Southwest Products, Inc.. Government technical data includes 9 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 6 commercial cross-references from 5 manufacturers, enabling identification through both NSN and commercial part number lookups. 1 verified substitute exists in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN3120-00-661-7138
Primary Part NumberBLN4003GCMILG3278
Item NameBearing,plain,self-Aligning
FSC / FSG3120 / 31 — No Item Name Available
ManufacturerRbc Southwest Products, Inc.
StatusACTIVE
Bore Diameter0.2495 INCHES MINIMUM AND 0.2500 INCHES MAXIMUM IN
MaterialCOPPER ALLOY OUTER RACE MEMBER
Style DesignatorWITHOUT INSERT OR LINER
Surface TreatmentCADMIUM OUTER RACE MEMBER
Lubrication FeatureGROOVE EXTERNAL OUTER MEMBER
MaterialSTEEL INNER MEMBER
Outer Member Width0.2450 INCHES NOMINAL IN
Inner Member Width0.3380 INCHES MINIMUM AND 0.3430 INCHES MAXIMUM IN
Outer Member Outside Diameter0.6557 INCHES MINIMUM AND 0.6562 INCHES MAXIMUM IN
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 1
3120-00-580-9479HSBG4 INTERCHANGEABLE
Bearing,plain,self-Aligning
U S Bearings
Cross-Reference Index
Part NumberManufacturer
0404L Acor Inc (USA)
BLN4003GCMILG3278 PRIMARY Rbc Southwest Products, Inc. (USA)
PRB4 PRIMARY Radial Bearing Corporation Dba Radial Bearing Corp of Connecticu Div Radial Bearing Llc (USA)
BLN4003GC PRIMARY Rbc Southwest Products, Inc. (USA)
KSBG4 PRIMARY Sargent Aerospace & Defense, Llc Dba Kahr Bearings (USA)
4M71A4G The Boeing Company Div Defense (USA)
Related Parts
3120-00-580-9479INTERCHANGEABLE
BEARING,PLAIN,SELF-ALIGNING
HSBG4

Frequently Asked Questions

What is NSN 3120-00-661-7138?

NSN 3120-00-661-7138 is a Bearing,plain,self-Aligning, manufactured by Rbc Southwest Products, Inc., classified under FSC 3120 (No Item Name Available). Status: active.

What are the part numbers for NSN 3120-00-661-7138?

NSN 3120-00-661-7138 has 6 cross-referenced part numbers: 0404L (Acor Inc), BLN4003GCMILG3278 (Rbc Southwest Products, Inc.), PRB4 (Radial Bearing Corporation Dba Radial Bearing Corp of Connecticu Div Radial Bearing Llc), BLN4003GC (Rbc Southwest Products, Inc.), KSBG4 (Sargent Aerospace & Defense, Llc Dba Kahr Bearings) and 1 more.

What NSN replaces 3120-00-661-7138?

There is 1 known substitute for 3120-00-661-7138: 3120-00-580-9479. Verify interchangeability with system specifications before substitution.

What are the specifications of BLN4003GCMILG3278?

Key specifications for BLN4003GCMILG3278: Bore Diameter: 0.2495 INCHES MINIMUM AND 0.2500 INCHES MAXIMUM IN; Material: COPPER ALLOY OUTER RACE MEMBER; Style Designator: WITHOUT INSERT OR LINER; Surface Treatment: CADMIUM OUTER RACE MEMBER. 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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