The Bushing,sleeve, cataloged under National Stock Number 3120-01-178-2139, is classified within Federal Supply Class 3120 (Bearings, Plain, Unmounted) of the Bearings group. The manufacturer of record is Timken Gears & Services Inc. Div Philadelphia Gear. Government technical data includes 12 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3120-01-178-2139 |
| Primary Part Number | 635A535-002 |
| Item Name | Bushing,sleeve |
| FSC / FSG | 3120 / 31 — Bearings, Plain, Unmounted |
| Manufacturer | Timken Gears & Services Inc. Div Philadelphia Gear |
| Status | ACTIVE |
| Surface Finish | 63.0 MICROINCHES RIGHT END SURFACE OF LEFT FLANGE |
| Surface Finish | 32.0 MICROINCHES INSIDE DIAMETER SURFACE OF BODY |
| Corner Shape | SQUARE ALL CORNERS |
| Flange Outside Diameter | 3.5000 INCHES NOMINAL IN |
| Body Outside Diameter | 1.3730 INCHES MINIMUM AND 1.3740 INCHES MAXIMUM IN |
| Style Designator | SOLID, EXTERNAL FLANGE ONE END |
| Material Document and Classification | B50R57D,FSCM 01289 MFR REF SINGLE MATERIAL RESPONSE OVERALL |
| Body Inside Diameter | 0.4990 INCHES MINIMUM AND 0.5000 INCHES MAXIMUM IN |
| Antirotation/lubrication Type and Quantity | 3 HOLE |
| Flange Width | 0.5000 INCHES NOMINAL IN |
| Material | STEEL OVERALL |
| Hole Diameter | 0.5625 INCHES NOMINAL 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 |
|---|---|
| 7303E71 PIECE 215 | Timken Gears & Services Inc. Div Philadelphia Gear (USA) |
| 635A535-002 PRIMARY | Timken Gears & Services Inc. Div Philadelphia Gear (USA) |
| Reference | Meaning |
|---|---|
| 635A535 | 3/1 Design control — primary reference General Electric Company |
| 635A535-002 | 5/9 Secondary reference General Electric Company |
| A-3225116 | 5/1 Secondary reference U.S. Government activity |
| 7303E71 PIECE 215 | 5/9 Secondary reference General Electric Company |
NSN 3120-01-178-2139 is a Bushing,sleeve, manufactured by Timken Gears & Services Inc. Div Philadelphia Gear, classified under FSC 3120, Bearings, Plain, Unmounted. Status: active.
NSN 3120-01-178-2139 has 2 manufacturer part numbers on file: 7303E71 PIECE 215 (Timken Gears & Services Inc. Div Philadelphia Gear), 635A535-002 (Timken Gears & Services Inc. Div Philadelphia Gear).
Key specifications for 635A535-002: Surface Finish: 63.0 MICROINCHES RIGHT END SURFACE OF LEFT FLANGE; Surface Finish: 32.0 MICROINCHES INSIDE DIAMETER SURFACE OF BODY; Corner Shape: SQUARE ALL CORNERS; Flange Outside Diameter: 3.5000 INCHES NOMINAL IN. 12 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.