The Bearing,ball,duplex, cataloged under National Stock Number 3110-01-253-2187, 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 14 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3110-01-253-2187 |
| Primary Part Number | T660 |
| Item Name | Bearing,ball,duplex |
| FSC / FSG | 3110 / 31 — Bearings, Antifriction, Unmounted |
| Manufacturer | Mpb Corp Div Timken Super Precision |
| Status | ACTIVE |
| Bearing Preload Rating | 0.5 POUNDS MINIMUM AND 10.0 POUNDS MAXIMUM LBS |
| Surface Treatment Document and Classification | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Surface Finish | GROUND |
| Style Designator | COUNTERBORED OUTER RINGS, NON-SEPARABLE, BACK TO BACK MOUNTING |
| Material Document and Classification | UNABLE TO DECODE |
| Overall Outside Diameter | 3.2498 INCHES MINIMUM AND 3.2500 INCHES MAXIMUM IN |
| Contact Angle | 25.0 DEGREES NOMINAL |
| Load Direction | RADIAL |
| Surface Treatment | PASSIVATE OVERALL |
| Standard Tolerance Designation | ABEC NO.5 |
| Bore Diameter | 2.8748 INCHES MINIMUM AND 2.8750 INCHES MAXIMUM IN |
| Material | LUBRICANT DRY FILM LUBRICATION |
| Material | STEEL OVERALL |
| Lubrication Material Document and Classification | MIL-G-21164 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 | X |
| Part Number | Manufacturer |
|---|---|
| T660 PRIMARY | Mpb Corp Div Timken Super Precision (USA) |
| 3TAR46-52-1 PRIMARY | Mpb Corp Div Timken Super Precision (USA) |
| Reference | Meaning |
|---|---|
| 13534201 | 5/9 Secondary reference Kaydon Corp Plant 2 |
| 2690054-1 | 7/2 Vendor item drawing reference U.S. Government activity |
NSN 3110-01-253-2187 is a Bearing,ball,duplex, manufactured by Mpb Corp Div Timken Super Precision, classified under FSC 3110, Bearings, Antifriction, Unmounted. Status: active.
NSN 3110-01-253-2187 has 2 manufacturer part numbers on file: T660 (Mpb Corp Div Timken Super Precision), 3TAR46-52-1 (Mpb Corp Div Timken Super Precision).
Key specifications for T660: Bearing Preload Rating: 0.5 POUNDS MINIMUM AND 10.0 POUNDS MAXIMUM LBS; Surface Treatment Document and Classification: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL; Surface Finish: GROUND; Style Designator: COUNTERBORED OUTER RINGS, NON-SEPARABLE, BACK TO BACK MOUNTING. 14 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.