PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

728300Ring,bearing,inner

American Standard Inc Westinghouse Air Brake Co Div · NSN 3110-00-975-2132 · FSC 3110 · No Item Name Available
Verified by PartsTable
NSN 3110-00-975-2132 — this item is cataloged by the U.S. Government under National Stock Number 3110-00-975-2132. Primary manufacturer part number: 728300.
Features
  • Ring,bearing,inner — FSC 3110
  • Bore Shape: NONSTANDARD TAPER
  • Overall Outside Diameter: 2.4994 INCHES MINIMUM AND 2.5000 INCHES MAXIMUM IN
  • Style Designator: SOLID INNER RACE, WITH BORE CHAMFER, JOURNAL AND NEEDLE
  • Material: STEEL OVERALL
  • Surface Finish: GROUND
  • Bore Diameter: 2.1679 INCHES MINIMUM AND 2.1687 INCHES MAXIMUM IN
  • 3 verified cross-references
Applications
  • Rotating machinery support and alignment
  • Shaft load distribution
  • Precision spindle assemblies
  • Applications requiring Steel Overall construction
General Description

The Ring,bearing,inner, cataloged under National Stock Number 3110-00-975-2132, is classified within Federal Supply Class 3110 (No Item Name Available) of the Bearings group. The primary manufacturer of record is American Standard Inc Westinghouse Air Brake Co Div. Government technical data includes 6 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 3 commercial cross-references from 3 manufacturers, enabling identification through both NSN and commercial part number lookups. 9 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN3110-00-975-2132
Primary Part Number728300
Item NameRing,bearing,inner
FSC / FSG3110 / 31 — No Item Name Available
ManufacturerAmerican Standard Inc Westinghouse Air Brake Co Div
StatusACTIVE
Bore ShapeNONSTANDARD TAPER
Overall Outside Diameter2.4994 INCHES MINIMUM AND 2.5000 INCHES MAXIMUM IN
Style DesignatorSOLID INNER RACE, WITH BORE CHAMFER, JOURNAL AND NEEDLE
MaterialSTEEL OVERALL
Surface FinishGROUND
Bore Diameter2.1679 INCHES MINIMUM AND 2.1687 INCHES MAXIMUM IN
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 9
3110-00-100-03320042898-7 INTERCHANGEABLE
Cup,tapered Roller Bearing
New Holland Construction
1240-00-171-41771235962 INTERCHANGEABLE
Window,optical Instrument
Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier
5330-00-176-4123141A77 INTERCHANGEABLE
Gasket
Cummins Power Generation Inc.
5985-00-671-8324712260-23 INTERCHANGEABLE
Dummy Load,electrical
Raytheon Company Div Rmd Strategic
5305-01-104-274530091 INTERCHANGEABLE
Screw,cap,hexagon Head
Leroi International Inc Dba Compair Leroi
5935-01-124-2461C8804-6-1 INTERCHANGEABLE
Connector,plug,electrical
Lockheed Martin Corporation Div Lockheed Martin Aeronautics Company
5950-01-149-923230091 INTERCHANGEABLE
Transformer,power
Transistor Devices Inc Div Astrodyne Tdi High Power Business Unit
4820-01-242-147127301 PC6 3IN INTERCHANGEABLE
Disk,valve
Crane Co Div Valve Div
4820-01-242-297027301 PC9 3IN INTERCHANGEABLE
Stem,fluid Valve
Crane Co Div Valve Div
Cross-Reference Index
Part NumberManufacturer
728300 American Standard Inc Westinghouse Air Brake Co Div (USA)
728300 Wabco Construction and Mining Equipment Group Indianapolis Plant an American Standard Inc Co (USA)
30091 General Motors Corp Delco Moraine Ndh Div (USA)
Related Parts
3110-00-100-0332INTERCHANGEABLE
CUP,TAPERED ROLLER BEARING
0042898-7
1240-00-171-4177INTERCHANGEABLE
WINDOW,OPTICAL INSTRUMENT
1235962
5330-00-176-4123INTERCHANGEABLE
GASKET
141A77
5985-00-671-8324INTERCHANGEABLE
DUMMY LOAD,ELECTRICAL
712260-23
5305-01-104-2745INTERCHANGEABLE
SCREW,CAP,HEXAGON HEAD
30091
5935-01-124-2461INTERCHANGEABLE
CONNECTOR,PLUG,ELECTRICAL
C8804-6-1
5950-01-149-9232INTERCHANGEABLE
TRANSFORMER,POWER
30091
4820-01-242-1471INTERCHANGEABLE
DISK,VALVE
27301 PC6 3IN
4820-01-242-2970INTERCHANGEABLE
STEM,FLUID VALVE
27301 PC9 3IN

Frequently Asked Questions

What is NSN 3110-00-975-2132?

NSN 3110-00-975-2132 is a Ring,bearing,inner, manufactured by American Standard Inc Westinghouse Air Brake Co Div, classified under FSC 3110 (No Item Name Available). Status: active.

What are the part numbers for NSN 3110-00-975-2132?

NSN 3110-00-975-2132 has 3 cross-referenced part numbers: 728300 (American Standard Inc Westinghouse Air Brake Co Div), 728300 (Wabco Construction and Mining Equipment Group Indianapolis Plant an American Standard Inc Co), 30091 (General Motors Corp Delco Moraine Ndh Div).

What NSN replaces 3110-00-975-2132?

There are 9 known substitutes for 3110-00-975-2132: 3110-00-100-0332, 1240-00-171-4177, 5330-00-176-4123 and 6 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 728300?

Key specifications for 728300: Bore Shape: NONSTANDARD TAPER; Overall Outside Diameter: 2.4994 INCHES MINIMUM AND 2.5000 INCHES MAXIMUM IN; Special Features: TWO @1/4 IN. DIA HOLES 180 DEG APART 0.562 IN. FROM END,ROCKWELL HARDNESS RATING 60 TO 64,FINSH CASE HARDEN 0.025 IN. TO 0.045 IN. MAX TAPER,ID 0.0005 IN.,OD 0.0004 IN.,WALL 0.0006 IN. INSIDE CORNERS CHAMFERED IN; Style Designator: SOLID INNER RACE, WITH BORE CHAMFER, JOURNAL AND NEEDLE. 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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