The Bearing,sleeve, cataloged under National Stock Number 3120-01-321-2173, is classified within Federal Supply Class 3120 (Bearings, Plain, Unmounted) of the Bearings group. The manufacturer of record is Martin-Baker Aircraft Company Limited. Government technical data includes 3 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Item Name | Bearing,sleeve |
| FSC / FSG | 3120 — Bearings, Plain, Unmounted (FSG 31) |
| Manufacturers | Martin-Baker Aircraft Company Limited (CAGE U1604) |
| Parameter | Value |
|---|---|
| NSN | 3120-01-321-2173 |
| Primary Part Number | MB200-404 |
| Item Name | Bearing,sleeve |
| FSC / FSG | 3120 / 31 — Bearings, Plain, Unmounted |
| Manufacturer | Martin-Baker Aircraft Company Limited |
| Status | ACTIVE |
| Body Outside Diameter | 0.4370 INCHES NOMINAL IN |
| Body Inside Diameter | 0.1960 INCHES NOMINAL IN |
| Material | ALUMINUM ALLOY OVERALL |
| 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 |
|---|---|
| MB200-404 | Martin-Baker Aircraft Company Limited (GBR) |
| Reference | Meaning |
|---|---|
| MB200-404 | 3/9 Design control — primary reference Hk Systems Inc. Dba Material Handling Systems Div |
NSN 3120-01-321-2173 is a Bearing,sleeve, manufactured by Martin-Baker Aircraft Company Limited, classified under FSC 3120, Bearings, Plain, Unmounted. Status: active.
NSN 3120-01-321-2173 has 1 manufacturer part number on file: MB200-404 (Martin-Baker Aircraft Company Limited).
Key specifications for MB200-404: Body Outside Diameter: 0.4370 INCHES NOMINAL IN; Overall Length: 0.1560 INCHES NOMINAL IN; Body Inside Diameter: 0.1960 INCHES NOMINAL IN; Material: ALUMINUM ALLOY OVERALL. 3 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.