The Pulley,timing Belt, cataloged under National Stock Number 3020-01-256-5398, is classified within Federal Supply Class 3020 (Gears, Pulleys, Sprockets, and Transmission Chain) of the Mechanical Power Transmission Equipment group. The manufacturer of record is Northrop Grumman Systems Corporation. Government technical data includes 8 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3020-01-256-5398 |
| Primary Part Number | 1802891-7 |
| Item Name | Pulley,timing Belt |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | Northrop Grumman Systems Corporation |
| Status | ACTIVE |
| Hub Type | SETSCREW |
| Hub Diameter | 0.500 INCHES NOMINAL IN |
| Face Type | SINGLE ROW SPROCKET TEETH |
| Bore Type | SPECIFIED |
| Face Groove/tooth Quantity | 25 |
| Bore Diameter | 0.250 INCHES NOMINAL IN |
| Material | PLASTIC |
| Face Width | 0.312 INCHES NOMINAL 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 |
|---|---|
| 1802891-7 PRIMARY | Northrop Grumman Systems Corporation (USA) |
| Reference | Meaning |
|---|---|
| 25M-DF | 5/9 Secondary reference Plastock Inc Div of Plastimatic Inc |
| 1802891 | 7/1 Vendor item drawing reference Northrop Grumman Systems Corporation |
NSN 3020-01-256-5398 is a Pulley,timing Belt, manufactured by Northrop Grumman Systems Corporation, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-01-256-5398 has 1 manufacturer part number on file: 1802891-7 (Northrop Grumman Systems Corporation).
1 possible match (shared part number, not a government interchangeability claim): 3020-01-256-5399. Verify interchangeability with system specifications before substitution.
Key specifications for 1802891-7: Hub Type: SETSCREW; Hub Diameter: 0.500 INCHES NOMINAL IN; Face Type: SINGLE ROW SPROCKET TEETH; Overall Length: 0.688 INCHES NOMINAL IN. 8 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.