The Pulley,groove, cataloged under National Stock Number 3020-00-684-7660, 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 24 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. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3020-00-684-7660 |
| Primary Part Number | 121BM10044-1 |
| Item Name | Pulley,groove |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | Northrop Grumman Systems Corporation |
| Status | ACTIVE |
| Integral Cooling Vane | NOT INCLUDED |
| Hub Outside Diameter | 1.125 INCHES MINIMUM AND 1.140 INCHES MAXIMUM BOTH ENDS IN |
| Bore Feature | INCLUDED |
| Split Hub Feature | NOT INCLUDED |
| Bore Length | 0.875 INCHES NOMINAL IN |
| Design Form | PLAIN |
| Groove Radius | 0.250 INCHES NOMINAL IN |
| Groove Shape | U |
| Outside Diameter | 7.000 INCHES NOMINAL IN |
| Style Designator | WEBBED OR SPOKED |
| Material Document and Classification | MIL-P-15035, TYPE FBM MIL SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Groove Depth | 0.500 INCHES MINIMUM AND 0.510 INCHES MAXIMUM IN |
| Bore Type | STRAIGHT |
| Bearings | NOT INCLUDED |
| Groove Quantity | 1 |
| Unable to Decode | UNABLE TO DECODE AND UNABLE TO DECODE |
| Distance From Outside Flange/rim to Hub End and Location | 0.063 INCHES NOMINAL BOTH ENDS IN |
| Counterbore Feature | NOT INCLUDED |
| Bore Diameter | 0.451 INCHES MINIMUM AND 0.458 INCHES MAXIMUM IN |
| Material | PLASTIC PHENOLIC AND COTTON OVERALL |
| Unable to Decode | UNABLE TO DECODE |
| Face Width | 0.749 INCHES NOMINAL IN |
| Groove Width | 0.500 INCHES MINIMUM AND 0.515 INCHES MAXIMUM IN |
| Lightening Hole | 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 |
|---|---|
| 121BM10044-1 PRIMARY | Northrop Grumman Systems Corporation (USA) |
NSN 3020-00-684-7660 is a Pulley,groove, manufactured by Northrop Grumman Systems Corporation, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-00-684-7660 has 1 manufacturer part number on file: 121BM10044-1 (Northrop Grumman Systems Corporation).
Key specifications for 121BM10044-1: Integral Cooling Vane: NOT INCLUDED; Hub Outside Diameter: 1.125 INCHES MINIMUM AND 1.140 INCHES MAXIMUM BOTH ENDS IN; Bore Feature: INCLUDED; Split Hub Feature: NOT INCLUDED. 24 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.