PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

KS4AC1Bearing,ball,airframe

Rbc Aircraft Products, Inc. · NSN 3110-01-144-3960 · FSC 3110 · No Item Name Available
Verified by PartsTable
NSN 3110-01-144-3960 — this item is cataloged by the U.S. Government under National Stock Number 3110-01-144-3960. Primary manufacturer part number: KS4AC1.
Features
  • Bearing,ball,airframe — FSC 3110
  • Outer Ring Width: 0.2140 INCHES MINIMUM AND 0.2190 INCHES MAXIMUM IN
  • Style Designator: SINGLE ROW, EXTERNAL SELF ALIGNING, W/ALIGNING RING
  • Material: STEEL CORROSION RESISTING OVERALL
  • Inner Ring Width: 0.2760 INCHES MINIMUM AND 0.2810 INCHES MAXIMUM IN
  • Load Direction: RADIAL
  • Retainer Fabrication Method: PRESSED
  • Overall Outside Diameter: 0.7000 INCHES MINIMUM AND 0.7500 INCHES MAXIMUM IN
Applications
  • Rotating machinery support and alignment
  • Shaft load distribution
  • Precision spindle assemblies
  • Applications requiring Steel Corrosion Resisting Overall construction
General Description

The Bearing,ball,airframe, cataloged under National Stock Number 3110-01-144-3960, is classified within Federal Supply Class 3110 (No Item Name Available) of the Bearings group. The primary manufacturer of record is Rbc Aircraft Products, Inc.. Government technical data includes 8 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 4 commercial cross-references from 3 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
NSN3110-01-144-3960
Primary Part NumberKS4AC1
Item NameBearing,ball,airframe
FSC / FSG3110 / 31 — No Item Name Available
ManufacturerRbc Aircraft Products, Inc.
StatusACTIVE
Outer Ring Width0.2140 INCHES MINIMUM AND 0.2190 INCHES MAXIMUM IN
Style DesignatorSINGLE ROW, EXTERNAL SELF ALIGNING, W/ALIGNING RING
MaterialSTEEL CORROSION RESISTING OVERALL
Inner Ring Width0.2760 INCHES MINIMUM AND 0.2810 INCHES MAXIMUM IN
Load DirectionRADIAL
Retainer Fabrication MethodPRESSED
Overall Outside Diameter0.7000 INCHES MINIMUM AND 0.7500 INCHES MAXIMUM IN
Bore Diameter0.3660 INCHES NOMINAL IN
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 2
3110-00-042-4807MS27645-4A INTERCHANGEABLE
Bearing,ball,airframe
Sae International Dba Sae International
3120-01-122-3070HSP4-157 INTERCHANGEABLE
Bearing,plain,self-Aligning
U S Bearings
Cross-Reference Index
Part NumberManufacturer
KS4AC1 PRIMARY Rbc Aircraft Products, Inc. (USA)
KS4AC1 Timken Co Div the Timken Company (USA)
218-42309-101 Triumph Aerostructures, Llc Dba Triumph Aerostructures - Vought Integrated Programs Division (USA)
KS4A Timken Co Div the Timken Company (USA)
Related Parts
3110-00-042-4807INTERCHANGEABLE
BEARING,BALL,AIRFRAME
MS27645-4A
3120-01-122-3070INTERCHANGEABLE
BEARING,PLAIN,SELF-ALIGNING
HSP4-157

Frequently Asked Questions

What is NSN 3110-01-144-3960?

NSN 3110-01-144-3960 is a Bearing,ball,airframe, manufactured by Rbc Aircraft Products, Inc., classified under FSC 3110 (No Item Name Available). Status: active.

What are the part numbers for NSN 3110-01-144-3960?

NSN 3110-01-144-3960 has 4 cross-referenced part numbers: KS4AC1 (Rbc Aircraft Products, Inc.), KS4AC1 (Timken Co Div the Timken Company), 218-42309-101 (Triumph Aerostructures, Llc Dba Triumph Aerostructures - Vought Integrated Programs Division), KS4A (Timken Co Div the Timken Company).

What NSN replaces 3110-01-144-3960?

There are 2 known substitutes for 3110-01-144-3960: 3110-00-042-4807, 3120-01-122-3070. Verify interchangeability with system specifications before substitution.

What are the specifications of KS4AC1?

Key specifications for KS4AC1: Outer Ring Width: 0.2140 INCHES MINIMUM AND 0.2190 INCHES MAXIMUM IN; Style Designator: SINGLE ROW, EXTERNAL SELF ALIGNING, W/ALIGNING RING; Material: STEEL CORROSION RESISTING OVERALL; Inner Ring Width: 0.2760 INCHES MINIMUM AND 0.2810 INCHES MAXIMUM IN. 8 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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