PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

KB4ESSFNWBearing,plain,rod End

Sargent Aerospace & Defense, Llc Dba Kahr Bearings · NSN 3120-00-407-4375 · FSC 3120 · No Item Name Available
Verified by PartsTable
NSN 3120-00-407-4375 — this item is cataloged by the U.S. Government under National Stock Number 3120-00-407-4375. Primary manufacturer part number: KB4ESSFNW.
Features
  • Bearing,plain,rod End — FSC 3120
  • Bore Diameter: 0.2495 INCHES MINIMUM AND 0.2515 INCHES MAXIMUM IN
  • Outer Member Outside Diameter: 0.7710 INCHES MINIMUM AND 0.7910 INCHES MAXIMUM IN
  • Thread Direction: RIGHT-HAND
  • Inner Member Width: 0.4320 INCHES MINIMUM AND 0.4370 INCHES MAXIMUM IN
  • Test Data Document: 81349-MIL-I-6868 SPECIFICATION (INCLUDES ENGINEERING TYPE BULLETINS, BROCHURES,ETC., THAT REFLECT SPECIFICATION TYPE DATA IN SPECIFICATION FORMAT; EXCLUDES COMMERCIAL CATALOGS, INDUSTRY DIRECTORIES, AND SIMILAR TRADE PUBLICATIONS, REFLECTING GENERAL TYPE DATA ON CERTAIN ENVIRONMENTAL AND PERFORMANCE REQUIREMENTS AND TEST CONDITIONS THAT ARE SHOWN AS "TYPICAL", "AVERAGE", "NOMINAL", ETC.).
  • Thread Series Designator: UNF
  • Material: BRONZE AND ALUMINUM OUTER LAYER
Applications
  • Rotating machinery support and alignment
  • Shaft load distribution
  • Precision spindle assemblies
  • Applications requiring Bronze and Aluminum Outer Layer construction
General Description

The Bearing,plain,rod End, cataloged under National Stock Number 3120-00-407-4375, is classified within Federal Supply Class 3120 (No Item Name Available) of the Bearings group. The primary manufacturer of record is Sargent Aerospace & Defense, Llc Dba Kahr Bearings. Government technical data includes 20 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 7 commercial cross-references from 7 manufacturers, enabling identification through both NSN and commercial part number lookups. 6 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Cancelled.

Technical Specifications
ParameterValue
NSN3120-00-407-4375
Primary Part NumberKB4ESSFNW
Item NameBearing,plain,rod End
FSC / FSG3120 / 31 — No Item Name Available
ManufacturerSargent Aerospace & Defense, Llc Dba Kahr Bearings
StatusCANCELLED
Bore Diameter0.2495 INCHES MINIMUM AND 0.2515 INCHES MAXIMUM IN
Outer Member Outside Diameter0.7710 INCHES MINIMUM AND 0.7910 INCHES MAXIMUM IN
Thread DirectionRIGHT-HAND
Inner Member Width0.4320 INCHES MINIMUM AND 0.4370 INCHES MAXIMUM IN
Test Data Document81349-MIL-I-6868 SPECIFICATION (INCLUDES ENGINEERING TYPE BULLETINS, BROCHURES,ETC., THAT REFLECT SPECIFICATION TYPE DATA IN SPECIFICATION FORMAT; EXCLUDES COMMERCIAL CATALOGS, INDUSTRY DIRECTORIES, AND SIMILAR TRADE PUBLICATIONS, REFLECTING GENERAL TYPE DATA ON CERTAIN ENVIRONMENTAL AND PERFORMANCE REQUIREMENTS AND TEST CONDITIONS THAT ARE SHOWN AS "TYPICAL", "AVERAGE", "NOMINAL", ETC.).
Thread Series DesignatorUNF
MaterialBRONZE AND ALUMINUM OUTER LAYER
MaterialSTEEL COMP E52100 INNER MEMBER
Thread Class3A A
Shank Thread Length0.9690 INCHES MINIMUM AND 1.0620 INCHES MAXIMUM IN
Thread Quantity Per Inch3
Features ProvidedFLUSH LUBRICATION FITTING
Style DesignatorBALL TYPE
Thread Diameter0.3120 INCHES NOMINAL IN
Bore Center to Shank End Distance1.5520 INCHES MINIMUM AND 1.5720 INCHES MAXIMUM IN
MaterialSTEEL COMP 4130 INSIDE DIAMETER SURFACE OF BODY
Lubrication FeatureGROOVE INTERNAL OUTER MEMBER
Static Radial Load Rating4500 POUNDS LBS
Shank StyleEXTERNALLY THREADED
Outer Member Width0.3320 INCHES MINIMUM AND 0.3420 INCHES MAXIMUM IN
Lifecycle & Compliance
Acquisition StatusCANCELLED
HAZMATNo
Verified Substitutes 6
5305-00-286-052051281 INTERCHANGEABLE
Setscrew
Sealcraft Corporation
3020-00-517-3249206-401 INTERCHANGEABLE
Gear,helical
Northrop Grumman Systems Corp Dba Northrop Grumman Systems Corp
5360-00-792-777351281 INTERCHANGEABLE
Spring,helical,compression
Aerol Llc
5950-00-943-39595-1281 INTERCHANGEABLE
Transformer,power Autotransforme
Superior Electric Holding Group Llc Div Specialty Product Technologies
2920-01-269-792051-281 INTERCHANGEABLE
Generator,engine Accessory
Prestolite Electric Inc
8345-01-590-3005 INTERCHANGEABLE
Flag,support Command of Division
Cross-Reference Index
Part NumberManufacturer
10S04-115W Rbc Specline Inc Dba Specline Inc (USA)
KB4ESSFNW PRIMARY Sargent Aerospace & Defense, Llc Dba Kahr Bearings (USA)
BRE4-2015 Rbc Southwest Products, Inc. (USA)
MXK4PAFG Roller Bearing Company of America, Inc. (USA)
51281 PRIMARY Rbc Transport Dynamics Corp Div Rbc Transport Dynamics (USA)
HB4E207 PRIMARY U S Bearings (USA)
STSKF200CS09 Lockheed Martin Corp (USA)
Related Parts
5305-00-286-0520INTERCHANGEABLE
SETSCREW
51281
3020-00-517-3249INTERCHANGEABLE
GEAR,HELICAL
206-401
5360-00-792-7773INTERCHANGEABLE
SPRING,HELICAL,COMPRESSION
51281
5950-00-943-3959INTERCHANGEABLE
TRANSFORMER,POWER AUTOTRANSFORME
5-1281
2920-01-269-7920INTERCHANGEABLE
GENERATOR,ENGINE ACCESSORY
51-281
8345-01-590-3005INTERCHANGEABLE
FLAG,SUPPORT COMMAND OF DIVISION

Frequently Asked Questions

What is NSN 3120-00-407-4375?

NSN 3120-00-407-4375 is a Bearing,plain,rod End, manufactured by Sargent Aerospace & Defense, Llc Dba Kahr Bearings, classified under FSC 3120 (No Item Name Available). Status: cancelled.

What are the part numbers for NSN 3120-00-407-4375?

NSN 3120-00-407-4375 has 7 cross-referenced part numbers: 10S04-115W (Rbc Specline Inc Dba Specline Inc), KB4ESSFNW (Sargent Aerospace & Defense, Llc Dba Kahr Bearings), BRE4-2015 (Rbc Southwest Products, Inc.), MXK4PAFG (Roller Bearing Company of America, Inc.), 51281 (Rbc Transport Dynamics Corp Div Rbc Transport Dynamics) and 2 more.

What NSN replaces 3120-00-407-4375?

There are 6 known substitutes for 3120-00-407-4375: 5305-00-286-0520, 3020-00-517-3249, 5360-00-792-7773 and 3 more. Verify interchangeability with system specifications before substitution.

What are the specifications of KB4ESSFNW?

Key specifications for KB4ESSFNW: Bore Diameter: 0.2495 INCHES MINIMUM AND 0.2515 INCHES MAXIMUM IN; Overall Length: 1.9530 INCHES NOMINAL IN; Outer Member Outside Diameter: 0.7710 INCHES MINIMUM AND 0.7910 INCHES MAXIMUM IN; Thread Direction: RIGHT-HAND. 22 total characteristics are documented in the Federal Logistics Information System.

Is NSN 3120-00-407-4375 still in active supply?

NSN 3120-00-407-4375 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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