The Gear,spur, cataloged under National Stock Number 3020-01-185-7900, 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 19 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 | 3020-01-185-7900 |
| Primary Part Number | B-5097 |
| 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 | 1.835 INCHES BOTH ENDS IN |
| Teeth Quantity | 27 |
| Body Style | PLAIN, SOLID |
| Counterbore Nominal Diameter | 2.560 INCHES BOTH ENDS IN |
| Bore Style | W/COUNTERBORE BOTH ENDS |
| Nominal Distance Between Body Face and Protruding Hub End | 1.437 INCHES FIRST END IN |
| Nominal Distance Between Body Face and Protruding Hub End | 2.687 INCHES SECOND END IN |
| First Step Nominal Length | 0.313 INCHES FIRST END IN |
| Nominal Overall Length | 6.060 INCHES IN |
| Style Designator | PROTRUDING HUBS |
| Pitch Diameter | 4.5000 INCHES NOMINAL IN |
| Tooth Form | STUB |
| Spline Quantity | 24 SECOND END |
| Nominal Outside Diameter | 4.933 INCHES IN |
| Pressure Angle | 20.0000 DEGREES |
| Material | STEEL OVERALL |
| Counterbore Nominal Depth | 0.360 INCHES FIRST END IN |
| Spline Pitch Diameter | 2.3750 INCHES NOMINAL SECOND END IN |
| Face Nominal Width | 1.885 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 |
|---|---|
| B-5097 PRIMARY | Twin Disc, Incorporated Dba Twin Disc Mid-Atlantic (USA) |
NSN 3020-01-185-7900 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 3020-01-185-7900 has 1 manufacturer part number on file: B-5097 (Twin Disc, Incorporated Dba Twin Disc Mid-Atlantic).
Key specifications for B-5097: Bore Nominal Diameter: 1.835 INCHES BOTH ENDS IN; Teeth Quantity: 27; Body Style: PLAIN, SOLID; Counterbore Nominal Diameter: 2.560 INCHES BOTH ENDS IN. 19 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.