The Pulley,groove, cataloged under National Stock Number 3020-01-194-3303, 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 C E Niehoff & Co. Government technical data includes 19 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 3020-01-194-3303 |
| Primary Part Number | N4025 |
| Item Name | Pulley,groove |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | C E Niehoff & Co |
| Status | ACTIVE |
| Integral Cooling Vane | NOT INCLUDED |
| Hub Outside Diameter | 3.120 INCHES NOMINAL AA END IN |
| Bore Feature | NOT INCLUDED |
| Split Hub Feature | NOT INCLUDED |
| Design Form | PLAIN |
| Groove Shape | V |
| Outside Diameter | 3.120 INCHES NOMINAL IN |
| Style Designator | WEBBED OR SPOKED |
| Pitch Diameter | 2.450 INCHES NOMINAL IN |
| Groove Depth | 0.670 INCHES NOMINAL IN |
| Groove Quantity | 1 |
| V Groove Angle in Deg | 36.0 |
| Protruding Hub Characteristic | PLAIN |
| Unable to Decode | UNABLE TO DECODE |
| Distance From Outside Flange/rim to Hub End and Location | 1.045 INCHES NOMINAL AA END AND 0.300 INCHES NOMINAL BB END IN |
| Material | STEEL OVERALL |
| Face Width | 0.575 INCHES NOMINAL IN |
| Groove Width | 0.350 INCHES NOMINAL IN |
| Lightening Hole | NOT INCLUDED |
| 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 |
|---|---|
| N4025 | C E Niehoff & Co (USA) |
| Reference | Meaning |
|---|---|
| B5-45-3312 | 5/9 Secondary reference U.S. Government activity |
| 5-45-3312 | 3/2 Design control — primary reference U.S. Government activity |
NSN 3020-01-194-3303 is a Pulley,groove, manufactured by C E Niehoff & Co, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-01-194-3303 has 1 manufacturer part number on file: N4025 (C E Niehoff & Co).
1 possible match (shared part number, not a government interchangeability claim): 7025-01-493-6645. Verify interchangeability with system specifications before substitution.
Key specifications for N4025: Integral Cooling Vane: NOT INCLUDED; Hub Outside Diameter: 3.120 INCHES NOMINAL AA END IN; Bore Feature: NOT INCLUDED; Split Hub Feature: NOT INCLUDED. 19 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.