The Bushing,sleeve, cataloged under National Stock Number 3120-01-006-4028, is classified within Federal Supply Class 3120 (Bearings, Plain, Unmounted) of the Bearings group. The manufacturer of record is The Boeing Company Div Defense. Government technical data includes 9 specifications, cited from the U.S. Government catalog. The record lists 5 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 3120-01-006-4028 |
| Primary Part Number | ST4M166-5-1025 |
| Item Name | Bushing,sleeve |
| FSC / FSG | 3120 / 31 — Bearings, Plain, Unmounted |
| Manufacturer | The Boeing Company Div Defense |
| Status | ACTIVE |
| Corner Shape | SQUARE ALL CORNERS |
| Body Outside Diameter | 0.4360 INCHES MINIMUM AND 0.4365 INCHES MAXIMUM IN |
| Style Designator | SOLID, PLAIN, NO OUTSIDE FLANGES |
| Material Document and Classification | AMS 5643 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Body Inside Diameter | 0.3125 INCHES MINIMUM AND 0.3135 INCHES MAXIMUM IN |
| Surface Treatment | PASSIVATE OVERALL |
| Antirotation/lubrication Type and Quantity | 2 HOLE |
| Material | STEEL COMP 630 OVERALL |
| Hole Diameter | 0.0780 INCHES MINIMUM AND 0.0830 INCHES MAXIMUM FIRST 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 |
|---|---|
| ST4M166-5-1025 | Mayday Manufacturing Co. (USA) |
| ST4M166-5-1025 | All Power Manufacturing Co. (USA) |
| ST4M166-5-1025 PRIMARY | The Boeing Company Div Defense (USA) |
| ST4M166-5-1025 | Avalon Machine Products Inc (USA) |
| ST4M166-5-1025 | Reid Products Inc. Dba Reid Products Inc (USA) |
| Reference | Meaning |
|---|---|
| ST4M166-5-1025 | 5/2 Secondary reference U.S. Government activity |
| ST4M166 | D/9 Drawing number reference only The Boeing Company Div Defense |
NSN 3120-01-006-4028 is a Bushing,sleeve, manufactured by The Boeing Company Div Defense, classified under FSC 3120, Bearings, Plain, Unmounted. Status: active.
NSN 3120-01-006-4028 has 5 manufacturer part numbers on file: ST4M166-5-1025 (Mayday Manufacturing Co.), ST4M166-5-1025 (All Power Manufacturing Co.), ST4M166-5-1025 (The Boeing Company Div Defense), ST4M166-5-1025 (Avalon Machine Products Inc), ST4M166-5-1025 (Reid Products Inc. Dba Reid Products Inc).
Key specifications for ST4M166-5-1025: Corner Shape: SQUARE ALL CORNERS; Body Outside Diameter: 0.4360 INCHES MINIMUM AND 0.4365 INCHES MAXIMUM IN; Style Designator: SOLID, PLAIN, NO OUTSIDE FLANGES; Material Document and Classification: AMS 5643 ASSN STD SINGLE MATERIAL RESPONSE OVERALL. 9 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.