The Gear,spur, cataloged under National Stock Number 3020-01-279-4641, 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 Mcelroy Marine Machinery. Government technical data includes 14 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3020-01-279-4641 |
| Primary Part Number | C-1281-85-34 |
| Item Name | Gear,spur |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | Mcelroy Marine Machinery |
| Status | ACTIVE |
| Keyway Nominal Width | 0.750 INCHES BOTH ENDS IN |
| Bore Nominal Diameter | 2.990 INCHES BOTH ENDS IN |
| Teeth Quantity | 13 |
| Body Style | PLAIN, SOLID |
| Bore Style | W/ KEYWAY BOTH ENDS |
| Hardness Rating | 300.0 BRINELL HULTGREN MINIMUM BORE SURFACE |
| Hardness Rating | 50.0 ROCKWELL C MINIMUM BODY |
| Style Designator | HUBLESS |
| Pitch Diameter | 6.5000 INCHES NOMINAL IN |
| Nominal Outside Diameter | 7.500 INCHES IN |
| Nominal Distance From Bore Center to Keyway Bottom | 2.245 INCHES BOTH ENDS IN |
| Pressure Angle | 20.0000 DEGREES |
| Material | STEEL COMP 4142 AND STEEL COMP 4340 AND STEEL COMP 8620 OVERALL |
| Face Nominal Width | 3.500 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 |
|---|---|
| C-1281-85-34 PRIMARY | Mcelroy Marine Machinery (USA) |
| Reference | Meaning |
|---|---|
| C-1281-85 | D/9 Drawing number reference only Mcelroy Marine Machinery |
NSN 3020-01-279-4641 is a Gear,spur, manufactured by Mcelroy Marine Machinery, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-01-279-4641 has 1 manufacturer part number on file: C-1281-85-34 (Mcelroy Marine Machinery).
Key specifications for C-1281-85-34: Keyway Nominal Width: 0.750 INCHES BOTH ENDS IN; Bore Nominal Diameter: 2.990 INCHES BOTH ENDS IN; Teeth Quantity: 13; Body Style: PLAIN, SOLID. 14 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.