PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

RF4012X48A512-20Bearing,ball,annular

Rmb Miniature Bearings Inc · NSN 3110-00-432-2540 · FSC 3110 · No Item Name Available
Verified by PartsTable
NSN 3110-00-432-2540 — this item is cataloged by the U.S. Government under National Stock Number 3110-00-432-2540. Primary manufacturer part number: RF4012X48A512-20.
Features
  • Bearing,ball,annular — FSC 3110
  • Lubrication Material Document and Classification: MIL-G-25013 MIL SPEC SINGLE MATERIAL RESPONSE
  • Seal Quantity: 2
  • Internal Clearance: 0.0005 INCHES MINIMUM RADIAL AND 0.0008 INCHES MAXIMUM RADIAL IN
  • Bearing Seal Type: CONTACT
  • Surface Finish: GROUND
  • Standard Tolerance Designation: ABEC NO.5
  • Retainer Fabrication Method: PRESSED
Applications
  • Rotating machinery support and alignment
  • Shaft load distribution
  • Precision spindle assemblies
  • Applications requiring Steel Corrosion Resisting Retainer construction
General Description

The Bearing,ball,annular, cataloged under National Stock Number 3110-00-432-2540, is classified within Federal Supply Class 3110 (No Item Name Available) of the Bearings group. The primary manufacturer of record is Rmb Miniature Bearings Inc. Government technical data includes 23 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 3 commercial cross-references from 2 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
NSN3110-00-432-2540
Primary Part NumberRF4012X48A512-20
Item NameBearing,ball,annular
FSC / FSG3110 / 31 — No Item Name Available
ManufacturerRmb Miniature Bearings Inc
StatusACTIVE
Lubrication Material Document and ClassificationMIL-G-25013 MIL SPEC SINGLE MATERIAL RESPONSE
Seal Quantity2
Internal Clearance0.0005 INCHES MINIMUM RADIAL AND 0.0008 INCHES MAXIMUM RADIAL IN
Bearing Seal TypeCONTACT
Surface FinishGROUND
Standard Tolerance DesignationABEC NO.5
Retainer Fabrication MethodPRESSED
Lubrication MaterialGREASE
Load DirectionRADIAL
Bore ShapeSTRAIGHT
MaterialSTEEL CORROSION RESISTING RETAINER
Material Document and ClassificationFED-STD-66 FED STD SINGLE MATERIAL RESPONSE BALL
Style DesignatorNON-LOADING GROOVE, NON-SEPARABLE
Material Document and ClassificationFED-STD-66 FED STD SINGLE MATERIAL RESPONSE OUTER RING
MaterialSTEEL COMP 440C BALL
Material Document and ClassificationCYRB285,05624 MFR REF SINGLE MATERIAL RESPONSE RETAINER
Material Document and ClassificationFED-STD-66 FED STD SINGLE MATERIAL RESPONSE INNER RING
Material Document and ClassificationCYRB285,05624 MFR REF SINGLE MATERIAL RESPONSE SEAL
MaterialSTEEL COMP 440C INNER RING
MaterialPLASTIC TETRAFLUOROETHYLENE SEAL
MaterialSTEEL COMP 440C OUTER RING
Overall Outside Diameter0.3750 INCHES NOMINAL IN
Bore Diameter0.1250 INCHES NOMINAL IN
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 1
3110-00-403-7591RF4012X-48-A5-15/20 INTERCHANGEABLE
Bearing,ball,annular
Rmb Miniature Bearings Inc
Cross-Reference Index
Part NumberManufacturer
CYRB285-0-0-05 Ge Aviation Systems Llc Dba Ge Aviation Systems Llc (USA)
RF4012X48A512-20 PRIMARY Rmb Miniature Bearings Inc (USA)
CYRB285 Ge Aviation Systems Llc Dba Ge Aviation Systems Llc (USA)
Related Parts
3110-00-403-7591INTERCHANGEABLE
BEARING,BALL,ANNULAR
RF4012X-48-A5-15/20

Frequently Asked Questions

What is NSN 3110-00-432-2540?

NSN 3110-00-432-2540 is a Bearing,ball,annular, manufactured by Rmb Miniature Bearings Inc, classified under FSC 3110 (No Item Name Available). Status: active.

What are the part numbers for NSN 3110-00-432-2540?

NSN 3110-00-432-2540 has 3 cross-referenced part numbers: CYRB285-0-0-05 (Ge Aviation Systems Llc Dba Ge Aviation Systems Llc), RF4012X48A512-20 (Rmb Miniature Bearings Inc), CYRB285 (Ge Aviation Systems Llc Dba Ge Aviation Systems Llc).

What NSN replaces 3110-00-432-2540?

There is 1 known substitute for 3110-00-432-2540: 3110-00-403-7591. Verify interchangeability with system specifications before substitution.

What are the specifications of RF4012X48A512-20?

Key specifications for RF4012X48A512-20: Lubrication Material Document and Classification: MIL-G-25013 MIL SPEC SINGLE MATERIAL RESPONSE; Seal Quantity: 2; Internal Clearance: 0.0005 INCHES MINIMUM RADIAL AND 0.0008 INCHES MAXIMUM RADIAL IN; Bearing Seal Type: CONTACT. 25 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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