The Gear,spur, cataloged under National Stock Number 3020-00-272-7541, 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 Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier. Government technical data includes 21 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3020-00-272-7541 |
| Primary Part Number | 778158 |
| Item Name | Gear,spur |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier |
| Status | ACTIVE |
| Bore Nominal Diameter | 1.4995 INCHES BOTH ENDS IN |
| Hub Nominal Diameter | 1.9370 INCHES SECOND END IN |
| Hub Nominal Diameter | 2.0000 INCHES FIRST END IN |
| Teeth Quantity | 72 |
| Body Style | WEBBED, WITH LIGHTENING HOLES |
| Bore Style | STRAIGHT SPLINE BOTH ENDS |
| Nominal Distance Between Body Face and Protruding Hub End | 0.1870 INCHES SECOND END IN |
| Nominal Distance Between Body Face and Protruding Hub End | 0.5630 INCHES FIRST END IN |
| Precision Classification | QUALITY NUMBER 12 |
| Hardness Rating | 25.0 ROCKWELL C MINIMUM AND 30.0 ROCKWELL C MAXIMUM HUB |
| Hardness Rating | 40.8 ROCKWELL C NOMINAL TEETH |
| Style Designator | PROTRUDING HUBS |
| Material Document and Classification | 66 FED STD SINGLE MATERIAL RESPONSE AND AISI/SAE 4140 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Pitch Diameter | 12.0000 INCHES NOMINAL IN |
| Tooth Form | STANDARD |
| Hub Style Designator | PLAIN BOTH ENDS |
| Spline Quantity | 6 BOTH ENDS |
| Nominal Outside Diameter | 12.2490 INCHES IN |
| Pressure Angle | 20.0000 DEGREES |
| Material | STEEL COMP 4140 OVERALL |
| Face Nominal Width | 1.2500 INCHES 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 |
|---|---|
| 778158 PRIMARY | Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier (USA) |
| BUWEPSDWG778158 PRIMARY | Navsurfwarcen Det Picatinny (USA) |
| Reference | Meaning |
|---|---|
| BUWEPSDWG778158 | 5/9 Secondary reference Department of the Navy Naval Surface Warfare Center Crane Detachment |
NSN 3020-00-272-7541 is a Gear,spur, manufactured by Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-00-272-7541 has 2 manufacturer part numbers on file: 778158 (Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier), BUWEPSDWG778158 (Navsurfwarcen Det Picatinny).
Key specifications for 778158: Bore Nominal Diameter: 1.4995 INCHES BOTH ENDS IN; Hub Nominal Diameter: 1.9370 INCHES SECOND END IN; Hub Nominal Diameter: 2.0000 INCHES FIRST END IN; Teeth Quantity: 72. 21 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.