The Bearing,plain,self-Aligning, cataloged under National Stock Number 3120-00-809-6348, is classified within Federal Supply Class 3120 (Bearings, Plain, Unmounted) of the Bearings group. The manufacturer of record is New Hampshire Ball Bearings Inc Div Astro Division. Government technical data includes 12 specifications, cited from the U.S. Government catalog. The record lists 4 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3120-00-809-6348 |
| Primary Part Number | ATB4-6 |
| Item Name | Bearing,plain,self-Aligning |
| FSC / FSG | 3120 / 31 — Bearings, Plain, Unmounted |
| Manufacturer | New Hampshire Ball Bearings Inc Div Astro Division |
| Status | ACTIVE |
| Inner Member Width | 0.6820 INCHES MINIMUM AND 0.6870 INCHES MAXIMUM IN |
| Hardness Rating | 28.0 ROCKWELL C MINIMUM AND 36.0 ROCKWELL C MAXIMUM OUTER RACE MEMBER |
| Hardness Rating | 56.0 ROCKWELL C NOMINAL INNER MEMBER |
| Outer Member Width | 0.4590 INCHES MINIMUM AND 0.4640 INCHES MAXIMUM IN |
| Style Designator | WITH INSERT AND/OR LINER |
| Surface Treatment | CHROMIUM INNER MEMBER |
| Static Radial Load Rating | 180000 POUNDS LBS |
| Bore Diameter | 0.2495 INCHES MINIMUM AND 0.2500 INCHES MAXIMUM IN |
| Material | PLASTIC POLYTETRAFLUOROETHYLENE RACE LINER |
| Material | STEEL COMP 440C OUTER RACE MEMBER |
| Material | STEEL COMP 410 INNER MEMBER |
| Outer Member Outside Diameter | 0.9009 INCHES MINIMUM AND 0.9014 INCHES MAXIMUM IN |
| 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 |
|---|---|
| ATB4-6 | New Hampshire Ball Bearings Inc Div Astro Division (USA) |
| LHSSV-4AE | Roller Bearing Company of America, Inc. (USA) |
| 76588-044 | Rbc Transport Dynamics Corp Div Rbc Transport Dynamics (USA) |
| GB520S4D | Northrop Grumman Systems Corporation (USA) |
| Reference | Meaning |
|---|---|
| BS8ATC29-2E7995 | 3/9 Design control — primary reference Timken Co Div the Timken Company |
| KSBN4-42 | 5/2 Secondary reference U.S. Government activity |
| BLFR-4-362 | 5/2 Secondary reference U.S. Government activity |
NSN 3120-00-809-6348 is a Bearing,plain,self-Aligning, manufactured by New Hampshire Ball Bearings Inc Div Astro Division, classified under FSC 3120, Bearings, Plain, Unmounted. Status: active.
NSN 3120-00-809-6348 has 4 manufacturer part numbers on file: ATB4-6 (New Hampshire Ball Bearings Inc Div Astro Division), LHSSV-4AE (Roller Bearing Company of America, Inc.), 76588-044 (Rbc Transport Dynamics Corp Div Rbc Transport Dynamics), GB520S4D (Northrop Grumman Systems Corporation).
Key specifications for ATB4-6: Inner Member Width: 0.6820 INCHES MINIMUM AND 0.6870 INCHES MAXIMUM IN; Hardness Rating: 28.0 ROCKWELL C MINIMUM AND 36.0 ROCKWELL C MAXIMUM OUTER RACE MEMBER; Hardness Rating: 56.0 ROCKWELL C NOMINAL INNER MEMBER; Outer Member Width: 0.4590 INCHES MINIMUM AND 0.4640 INCHES MAXIMUM IN. 12 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.