The Bearing,ball,annular, cataloged under National Stock Number 3110-01-133-9850, is classified within Federal Supply Class 3110 (Bearings, Antifriction, Unmounted) of the Bearings group. The manufacturer of record is Mpb Corp Div Timken Super Precision. Government technical data includes 13 specifications, cited from the U.S. Government catalog. The record lists 3 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3110-01-133-9850 |
| Primary Part Number | S518CHH3-LY231 |
| Item Name | Bearing,ball,annular |
| FSC / FSG | 3110 / 31 — Bearings, Antifriction, Unmounted |
| Manufacturer | Mpb Corp Div Timken Super Precision |
| Status | ACTIVE |
| Lubrication Material | GREASE |
| Internal Clearance | 0.0002 INCHES MINIMUM RADIAL AND 0.0008 INCHES MAXIMUM RADIAL IN |
| Surface Finish | GROUND |
| Shield Quantity | 2 |
| Style Designator | NON-LOADING GROOVE, NON-SEPARABLE |
| Material Document and Classification | AISI ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Overall Outside Diameter | 0.3123 INCHES MINIMUM AND 0.3125 INCHES MAXIMUM IN |
| Bore Shape | STRAIGHT |
| Load Direction | RADIAL |
| Standard Tolerance Designation | ABEC NO.3 |
| Bore Diameter | 0.1248 INCHES MINIMUM AND 0.1250 INCHES MAXIMUM IN |
| Material | STEEL COMP 440A OVERALL A |
| Lubrication Material Document and Classification | MIL-G-81322 MIL SPEC SINGLE MATERIAL RESPONSE |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | N |
| Part Number | Manufacturer |
|---|---|
| 80966-1 | Oeco, Llc Dba Pacific Scientific Oeco (USA) |
| S518CHH3-LY231 PRIMARY | Mpb Corp Div Timken Super Precision (USA) |
| SR820ZZK2T3C25 PRIMARY | Fag Bearings Corporation (USA) |
| Reference | Meaning |
|---|---|
| SR253PPK28/287 | 3/2 Design control — primary reference U.S. Government activity |
NSN 3110-01-133-9850 is a Bearing,ball,annular, manufactured by Mpb Corp Div Timken Super Precision, classified under FSC 3110, Bearings, Antifriction, Unmounted. Status: active.
NSN 3110-01-133-9850 has 3 manufacturer part numbers on file: 80966-1 (Oeco, Llc Dba Pacific Scientific Oeco), S518CHH3-LY231 (Mpb Corp Div Timken Super Precision), SR820ZZK2T3C25 (Fag Bearings Corporation).
1 possible match (shared part number, not a government interchangeability claim): 6685-01-467-6554. Verify interchangeability with system specifications before substitution.
Key specifications for S518CHH3-LY231: Lubrication Material: GREASE; Internal Clearance: 0.0002 INCHES MINIMUM RADIAL AND 0.0008 INCHES MAXIMUM RADIAL IN; Surface Finish: GROUND; Shield Quantity: 2. 13 specifications are documented in the U.S. Government catalog.
No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.