The Gear,spur, cataloged under National Stock Number 3020-00-005-7501, 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 Twin Disc, Incorporated Dba Twin Disc Mid-Atlantic. Government technical data includes 17 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 3020-00-005-7501 |
| Primary Part Number | B5149A |
| Item Name | Gear,spur |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | Twin Disc, Incorporated Dba Twin Disc Mid-Atlantic |
| Status | ACTIVE |
| Bore Nominal Diameter | 1.375 INCHES BOTH ENDS IN |
| Nominal Distance Between Body Face and Recessed Hub End | 0.4375 INCHES SECOND END IN |
| Teeth Quantity | 41 |
| Body Style | WEBBED, OFFSET, SOLID |
| Counterbore Nominal Diameter | 4.1875 INCHES COUNTERBORE FIRST END IN |
| Bore Style | W/COUNTERBORE COUNTERBORE FIRST END |
| Mounting Hole Type and Quantity | 3 PLAIN TRANSVERSELY THROUGH HUB FIRST END |
| Nominal Distance Between Body Face and Protruding Hub End | 1.625 INCHES FIRST END IN |
| Mounting Hole Nominal Diameter | 0.375 INCHES TRANSVERSELY THROUGH HUB FIRST END IN |
| Style Designator | ONE PROTRUDING HUB, ONE RECESSED HUB |
| Pitch Diameter | 5.1875 INCHES NOMINAL IN |
| Tooth Form | STANDARD |
| Nominal Outside Diameter | 5.375 INCHES IN |
| Material | STEEL OVERALL |
| Counterbore Nominal Depth | 2.500 INCHES COUNTERBORE FIRST END IN |
| Attachment Method | MOUNTING HOLE |
| Face Nominal Width | 1.875 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 |
NSN 3020-00-005-7501 is a Gear,spur, manufactured by Twin Disc, Incorporated Dba Twin Disc Mid-Atlantic, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-00-005-7501 has 2 manufacturer part numbers on file: B5149A (Twin Disc, Incorporated Dba Twin Disc Mid-Atlantic), 5199280 (Rolls-Royce Solutions America Inc).
Key specifications for B5149A: Bore Nominal Diameter: 1.375 INCHES BOTH ENDS IN; Nominal Distance Between Body Face and Recessed Hub End: 0.4375 INCHES SECOND END IN; Teeth Quantity: 41; Body Style: WEBBED, OFFSET, SOLID. 17 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.