The Bushing,sleeve, cataloged under National Stock Number 3120-00-345-2139, is classified within Federal Supply Class 3120 (Bearings, Plain, Unmounted) of the Bearings group. The manufacturer of record is All Power Manufacturing Co.. Government technical data includes 9 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3120-00-345-2139 |
| Primary Part Number | ST4M166-4-102 |
| Item Name | Bushing,sleeve |
| FSC / FSG | 3120 / 31 — Bearings, Plain, Unmounted |
| Manufacturer | All Power Manufacturing Co. |
| Status | ACTIVE |
| Corner Shape | SQUARE ALL CORNERS |
| Body Outside Diameter | 0.3735 INCHES MINIMUM AND 0.3740 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 | 0.2500 INCHES MINIMUM AND 0.2510 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 |
|---|---|
| ST4M166-4-102 PRIMARY | All Power Manufacturing Co. (USA) |
| ST4M166-4-102 PRIMARY | Reid Products Inc. Dba Reid Products Inc (USA) |
| ST4M166-4-102 PRIMARY | The Boeing Company Div Defense (USA) |
| ST4M166-4-102 PRIMARY | Mayday Manufacturing Co. (USA) |
| Reference | Meaning |
|---|---|
| ST4M166-4-102 | 3/2 Design control — primary reference U.S. Government activity |
| ST4M166-4-102 | 5/9 Secondary reference Avalon Machine Products Inc |
NSN 3120-00-345-2139 is a Bushing,sleeve, manufactured by All Power Manufacturing Co., classified under FSC 3120, Bearings, Plain, Unmounted. Status: active.
NSN 3120-00-345-2139 has 4 manufacturer part numbers on file: ST4M166-4-102 (All Power Manufacturing Co.), ST4M166-4-102 (Reid Products Inc. Dba Reid Products Inc), ST4M166-4-102 (The Boeing Company Div Defense), ST4M166-4-102 (Mayday Manufacturing Co.).
Key specifications for ST4M166-4-102: Corner Shape: SQUARE ALL CORNERS; Body Outside Diameter: 0.3735 INCHES MINIMUM AND 0.3740 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.