The Gear,spur, cataloged under National Stock Number 3020-01-436-9526, 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 Altra Industrial Motion Corp.. Government technical data includes 15 specifications, cited from the U.S. Government catalog. The record lists 4 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3020-01-436-9526 |
| Primary Part Number | NA 20B-1/2 |
| Item Name | Gear,spur |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | Altra Industrial Motion Corp. |
| Status | ACTIVE |
| Keyway Nominal Width | 0.126 INCHES BOTH ENDS IN |
| Bore Nominal Diameter | 0.500 INCHES BOTH ENDS IN |
| Hub Nominal Diameter | 0.844 INCHES SECOND END IN |
| Teeth Quantity | 20 |
| Body Style | PLAIN, SOLID |
| Bore Style | W/ KEYWAY BOTH ENDS |
| Nominal Distance Between Body Face and Protruding Hub End | 0.375 INCHES SECOND END IN |
| Style Designator | PROTRUDING HUB |
| Pitch Diameter | 1.0000 INCHES NOMINAL IN |
| Hub Style Designator | PLAIN SECOND END |
| Nominal Outside Diameter | 1.100 INCHES IN |
| Nominal Distance From Bore Center to Keyway Bottom | 0.328 INCHES BOTH ENDS IN |
| Pressure Angle | 14.3000 DEGREES |
| Material | STEEL OVERALL |
| Face Nominal Width | 0.375 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 |
|---|---|
| NA 20B-1/2 PRIMARY | Altra Industrial Motion Corp. (USA) |
| 581-6405752-B5 | Naval Sea Systems Command (USA) |
| 218016796 | Naval Sea Systems Command (USA) |
| 581-6405752 FIND AHNA-B5 | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| 581-6405752-B5 | 5/2 Secondary reference U.S. Government activity |
| 218016796 | 5/2 Secondary reference U.S. Government activity |
| 581-6405752 FIND AHNA-B5 | 5/2 Secondary reference U.S. Government activity |
NSN 3020-01-436-9526 is a Gear,spur, manufactured by Altra Industrial Motion Corp., classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-01-436-9526 has 4 manufacturer part numbers on file: NA 20B-1/2 (Altra Industrial Motion Corp.), 581-6405752-B5 (Naval Sea Systems Command), 218016796 (Naval Sea Systems Command), 581-6405752 FIND AHNA-B5 (Naval Sea Systems Command).
Key specifications for NA 20B-1/2: Keyway Nominal Width: 0.126 INCHES BOTH ENDS IN; Bore Nominal Diameter: 0.500 INCHES BOTH ENDS IN; Hub Nominal Diameter: 0.844 INCHES SECOND END IN; Teeth Quantity: 20. 15 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.