The Bearing,plain,rod End, cataloged under National Stock Number 3120-01-421-1543, is classified within Federal Supply Class 3120 (Bearings, Plain, Unmounted) of the Bearings group. The manufacturer of record is Roller Bearing Company of America, Inc.. Government technical data includes 16 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3120-01-421-1543 |
| Primary Part Number | HM4U |
| Item Name | Bearing,plain,rod End |
| FSC / FSG | 3120 / 31 — Bearings, Plain, Unmounted |
| Manufacturer | Roller Bearing Company of America, Inc. |
| Status | ACTIVE |
| Shank Thread Length | 1.0000 INCHES NOMINAL IN |
| Bore Center to Shank End Distance | 1.5520 INCHES MINIMUM AND 1.5720 INCHES MAXIMUM IN |
| Inner Member Width | 0.3700 INCHES MINIMUM AND 0.3750 INCHES MAXIMUM IN |
| Outer Member Width | 0.2735 INCHES MINIMUM AND 0.2860 INCHES MAXIMUM IN |
| Style Designator | BALL TYPE |
| Thread Diameter | 0.250 INCHES NOMINAL IN |
| Thread Direction | RIGHT-HAND |
| Shank Style | EXTERNALLY THREADED |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 28 |
| Bore Diameter | 0.2495 INCHES MINIMUM AND 0.2515 INCHES MAXIMUM IN |
| Material | STEEL INNER MEMBER |
| Material | STEEL COMP E52100 ROD END BODY |
| Material | COPPER RACE INSERT |
| Thread Series Designator | UNF |
| Outer Member Outside Diameter | 0.7400 INCHES MINIMUM AND 0.7600 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 |
|---|---|
| HM4U PRIMARY | Roller Bearing Company of America, Inc. (USA) |
NSN 3120-01-421-1543 is a Bearing,plain,rod End, manufactured by Roller Bearing Company of America, Inc., classified under FSC 3120, Bearings, Plain, Unmounted. Status: active.
NSN 3120-01-421-1543 has 1 manufacturer part number on file: HM4U (Roller Bearing Company of America, Inc.).
Key specifications for HM4U: Shank Thread Length: 1.0000 INCHES NOMINAL IN; Bore Center to Shank End Distance: 1.5520 INCHES MINIMUM AND 1.5720 INCHES MAXIMUM IN; Inner Member Width: 0.3700 INCHES MINIMUM AND 0.3750 INCHES MAXIMUM IN; Outer Member Width: 0.2735 INCHES MINIMUM AND 0.2860 INCHES MAXIMUM IN. 16 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.