The Bearing,plain,self-Aligning, cataloged under National Stock Number 3120-01-293-7976, is classified within Federal Supply Class 3120 (Bearings, Plain, Unmounted) of the Bearings group. The manufacturer of record is U S Bearings. Government technical data includes 14 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through both NSN and commercial part number lookups. 8 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3120-01-293-7976 |
| Primary Part Number | 4M342-18 |
| Item Name | Bearing,plain,self-Aligning |
| FSC / FSG | 3120 / 31 — Bearings, Plain, Unmounted |
| Manufacturer | U S Bearings |
| Status | ACTIVE |
| Inner Member Width | 0.9950 INCHES MINIMUM AND 1.0000 INCHES MAXIMUM IN |
| Hardness Rating | 28.0 ROCKWELL C MINIMUM AND 37.0 ROCKWELL C MAXIMUM OUTER RACE MEMBER |
| Hardness Rating | 43.0 ROCKWELL C MINIMUM AND 47.0 ROCKWELL C MAXIMUM INNER MEMBER |
| Outer Member Width | 0.8950 INCHES MINIMUM AND 0.9050 INCHES MAXIMUM IN |
| Style Designator | WITHOUT INSERT OR LINER WITH STAKING GROOVE |
| Material Document and Classification | AMS 5643 ASSN STD SINGLE MATERIAL RESPONSE OUTER RACE MEMBER |
| Material Document and Classification | QQ-C-530 FED SPEC ALL MATERIAL RESPONSES INNER MEMBER |
| Lubrication Feature | GROOVE AND PERFORATION INNER MEMBER |
| Static Radial Load Rating | 121500 POUNDS LBS |
| Bore Diameter | 1.1250 INCHES MINIMUM AND 1.1255 INCHES MAXIMUM IN |
| Material | COPPER ALLOY 172 OR COPPER ALLOY 173 INNER MEMBER |
| Material | STEEL COMP 630 OUTER RACE MEMBER |
| Material | OIL LUBRICATING LUBRICATION |
| Outer Member Outside Diameter | 2.0000 INCHES MINIMUM AND 2.0005 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 |
|---|---|
| 4M342-18 PRIMARY | U S Bearings (USA) |
| 4M342-18 PRIMARY | Rbc Specline Inc Dba Specline Inc (USA) |
| 4M342-18 | The Boeing Company Div Defense (USA) |
| Reference | Meaning |
|---|---|
| HSB18-101 | 5/9 Secondary reference Networks Electronic Company, Llc |
| HSB18-101 | 5/1 Secondary reference U S Bearings |
| BNG18H-342 | 5/1 Secondary reference Rbc Specline Inc Dba Specline Inc |
| 4M342-18 | 5/9 Secondary reference Rbc Transport Dynamics Corp Div Rbc Transport Dynamics |
| 4M342-18 | 5/9 Secondary reference New Hampshire Ball Bearings Inc Div Astro Division |
| AGB18V4003 | 5/1 Secondary reference New Hampshire Ball Bearings Inc Div Astro Division |
| 4M342-18 | 5/9 Secondary reference Networks Electronic Company, Llc |
| 03-582-18E-001 | 5/1 Secondary reference Rbc Transport Dynamics Corp Div Rbc Transport Dynamics |
NSN 3120-01-293-7976 is a Bearing,plain,self-Aligning, manufactured by U S Bearings, classified under FSC 3120, Bearings, Plain, Unmounted. Status: active.
NSN 3120-01-293-7976 has 3 manufacturer part numbers on file: 4M342-18 (U S Bearings), 4M342-18 (Rbc Specline Inc Dba Specline Inc), 4M342-18 (The Boeing Company Div Defense).
Key specifications for 4M342-18: Inner Member Width: 0.9950 INCHES MINIMUM AND 1.0000 INCHES MAXIMUM IN; Hardness Rating: 28.0 ROCKWELL C MINIMUM AND 37.0 ROCKWELL C MAXIMUM OUTER RACE MEMBER; Hardness Rating: 43.0 ROCKWELL C MINIMUM AND 47.0 ROCKWELL C MAXIMUM INNER MEMBER; Outer Member Width: 0.8950 INCHES MINIMUM AND 0.9050 INCHES MAXIMUM IN. 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.