The Bushing,sleeve, cataloged under National Stock Number 3120-01-477-5928, is classified within Federal Supply Class 3120 (Bearings, Plain, Unmounted) of the Bearings group. The manufacturer of record is Mayday Manufacturing Co.. 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3120-01-477-5928 |
| Primary Part Number | ST4M166-7-103 |
| Item Name | Bushing,sleeve |
| FSC / FSG | 3120 / 31 — Bearings, Plain, Unmounted |
| Manufacturer | Mayday Manufacturing Co. |
| Status | ACTIVE |
| Corner Shape | SQUARE ALL CORNERS |
| Surface Treatment Document and Classification | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Body Outside Diameter | 0.5610 INCHES MINIMUM AND 0.5615 INCHES MAXIMUM IN |
| Criticality Code Justification | AGAV |
| Style Designator | SOLID, PLAIN, NO OUTSIDE FLANGES |
| Material Document and Classification | AMS 5643 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Body Inside Diameter | 0.4375 INCHES MINIMUM AND 0.4385 INCHES MAXIMUM IN |
| Surface Treatment | PASSIVATE OVERALL |
| Material | STEEL COMP 630 OVERALL |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | Y |
| Part Number | Manufacturer |
|---|---|
| ST4M166-7-103 PRIMARY | Mayday Manufacturing Co. (USA) |
| ST4M166-7-103 PRIMARY | The Boeing Company Div Defense (USA) |
| ST4M166-7-103 PRIMARY | All Power Manufacturing Co. (USA) |
| ST4M166-7-103 | Reid Products Inc. Dba Reid Products Inc (USA) |
| ST4M166-7-103 | Avalon Machine Products Inc (USA) |
| Reference | Meaning |
|---|---|
| ST4M166-7-103 | 3/2 Design control — primary reference U.S. Government activity |
NSN 3120-01-477-5928 is a Bushing,sleeve, manufactured by Mayday Manufacturing Co., classified under FSC 3120, Bearings, Plain, Unmounted. Status: active.
NSN 3120-01-477-5928 has 5 manufacturer part numbers on file: ST4M166-7-103 (Mayday Manufacturing Co.), ST4M166-7-103 (The Boeing Company Div Defense), ST4M166-7-103 (All Power Manufacturing Co.), ST4M166-7-103 (Reid Products Inc. Dba Reid Products Inc), ST4M166-7-103 (Avalon Machine Products Inc).
Key specifications for ST4M166-7-103: Corner Shape: SQUARE ALL CORNERS; Surface Treatment Document and Classification: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL; Body Outside Diameter: 0.5610 INCHES MINIMUM AND 0.5615 INCHES MAXIMUM IN; Criticality Code Justification: AGAV. 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.