The Pulley,groove, cataloged under National Stock Number 3020-00-640-4675, 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 Emerson Electric Co Browning Mfg Div. Government technical data includes 29 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 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 | 3020-00-640-4675 |
| Primary Part Number | AK39 |
| Item Name | Pulley,groove |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | Emerson Electric Co Browning Mfg Div |
| Status | ACTIVE |
| Integral Cooling Vane | NOT INCLUDED |
| Hub Outside Diameter | 1.250 INCHES NOMINAL BOTH ENDS IN |
| Bore Feature | INCLUDED |
| Securing Method | THREADED HOLE(S) |
| Split Hub Feature | NOT INCLUDED |
| Bore Length | 1.625 INCHES NOMINAL IN |
| Design Form | PLAIN |
| Web/spoke Relationship to Face Centerline | NOT OFFSET |
| First End Length From Groove to End | 0.219 INCHES NOMINAL BOTH ENDS IN |
| Groove Shape | V |
| Standard V-Belt Section Designation for Which Designed | A |
| Outside Diameter | 3.750 INCHES NOMINAL IN |
| Keying Facility Type | KEYWAY |
| Quantity | 1 |
| Style Designator | PLAIN |
| Unable to Decode | UNABLE TO DECODE |
| Pitch Diameter | 3.500 INCHES NOMINAL IN |
| Groove Depth | 0.500 INCHES NOMINAL IN |
| Bore Type | STRAIGHT |
| Bearings | NOT INCLUDED |
| Groove Quantity | 1 |
| V Groove Angle in Deg | 20.0 |
| Protruding Hub Characteristic | GROOVED |
| Distance From Center of Bore to Bottom of Keyway | 0.438 INCHES NOMINAL IN |
| Securing Hole Quantity | 2 |
| Thread Size | 5/16 IN. -18 IN |
| Keyway Width | 0.188 INCHES NOMINAL IN |
| Unable to Decode | UNABLE TO DECODE |
| Distance From Outside Flange/rim to Hub End and Location | 0.875 INCHES NOMINAL BOTH ENDS 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 |
|---|---|
| AK39 PRIMARY | Emerson Electric Co Browning Mfg Div (USA) |
NSN 3020-00-640-4675 is a Pulley,groove, manufactured by Emerson Electric Co Browning Mfg Div, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-00-640-4675 has 1 manufacturer part number on file: AK39 (Emerson Electric Co Browning Mfg Div).
1 possible match (shared part number, not a government interchangeability claim): 3020-01-439-7519. Verify interchangeability with system specifications before substitution.
Key specifications for AK39: Integral Cooling Vane: NOT INCLUDED; Hub Outside Diameter: 1.250 INCHES NOMINAL BOTH ENDS IN; Bore Feature: INCLUDED; Securing Method: THREADED HOLE(S). 29 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.